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1. Sampling from Boltzmann densities with physics informed low-rank formats

Author

Hagemann, Paul, Schütte, Janina, Sommer, David, Eigel, Martin, and Steidl, Gabriele

Subjects
Computer Science - Machine Learning, Mathematics - Optimization and Control
Abstract

Our method proposes the efficient generation of samples from an unnormalized Boltzmann density by solving the underlying continuity equation in the low-rank tensor train (TT) format. It is based on the annealing path commonly used in MCMC literature, which is given by the linear interpolation in the space of energies. Inspired by Sequential Monte Carlo, we alternate between deterministic time steps from the TT representation of the flow field and stochastic steps, which include Langevin and resampling steps. These adjust the relative weights of the different modes of the target distribution and anneal to the correct path distribution. We showcase the efficiency of our method on multiple numerical examples.

Published
2024

2. Generative Modelling with Tensor Train approximations of Hamilton--Jacobi--Bellman equations

Author

Sommer, David, Gruhlke, Robert, Kirstein, Max, Eigel, Martin, and Schillings, Claudia

Subjects
Statistics - Machine Learning, Computer Science - Machine Learning, Mathematics - Statistics Theory, 35F21, 35Q84, 62F15, 65N75, 65C30
Abstract

Sampling from probability densities is a common challenge in fields such as Uncertainty Quantification (UQ) and Generative Modelling (GM). In GM in particular, the use of reverse-time diffusion processes depending on the log-densities of Ornstein-Uhlenbeck forward processes are a popular sampling tool. In Berner et al. [2022] the authors point out that these log-densities can be obtained by solution of a \textit{Hamilton-Jacobi-Bellman} (HJB) equation known from stochastic optimal control. While this HJB equation is usually treated with indirect methods such as policy iteration and unsupervised training of black-box architectures like Neural Networks, we propose instead to solve the HJB equation by direct time integration, using compressed polynomials represented in the Tensor Train (TT) format for spatial discretization. Crucially, this method is sample-free, agnostic to normalization constants and can avoid the curse of dimensionality due to the TT compression. We provide a complete derivation of the HJB equation's action on Tensor Train polynomials and demonstrate the performance of the proposed time-step-, rank- and degree-adaptive integration method on a nonlinear sampling task in 20 dimensions.

Published
2024

3. Machine Learning, Density Functional Theory, and Experiments to Understand the Photocatalytic Reduction of CO$_2$ by CuPt/TiO$_2$

Author

Sumaria, Vaidish, Rawal, Takat B., Li, Young Feng, Sommer, David, Vikoren, Jake, Bondi, Robert J., Rupp, Matthias, Prasad, Amrit, and Prasad, Deeptanshu

Subjects
Condensed Matter - Materials Science, Physics - Chemical Physics
Abstract

The photoconversion of CO$_2$ to hydrocarbons is a sustainable route to its transformation into value-added compounds and, thereby, crucial to mitigating the energy and climate crises. CuPt nanoparticles on TiO$_2$ surfaces have been reported to show promising photoconversion efficiency. For further progress, a mechanistic understanding of the catalytic properties of these CuPt/TiO$_2$ systems is vital. Here, we employ $\textit{ab-initio}$ calculations, machine learning, and photocatalysis experiments to explore their configurational space and examine their reactivity and find that the interface plays a key role in stabilizing *CO$_2$, *CO, and other CH-containing intermediates, facilitating higher activity and selectivity for methane. A bias-corrected machine-learning interatomic potential trained on density functional theory data enables efficient exploration of the potential energy surfaces of numerous CO$_2$@CuPt/TiO$_2$ configurations via basin-hopping Monte Carlo simulations, greatly accelerating the study of these photocatalyst systems. Our simulations show that CO$_2$ preferentially adsorbs at the interface, with C atom bonded to a Pt site and one O atom occupying an O-vacancy site. The interface also promotes the formation of *CH and *CH$_2$ intermediates. For confirmation, we synthesize CuPt/TiO$_2$ samples with a variety of compositions and analyze their morphologies and compositions using scanning electron microscopy and energy-dispersive X-ray spectroscopy, and measure their photocatalytic activity. Our computational and experimental findings qualitatively agree and highlight the importance of interface design for selective conversion of CO$_2$ to hydrocarbons., Comment: Main text: 16 pages and 7 figures; Supporting information: 10 pages and 9 figures; Page 1, affiliation re-ordering; Page 4, typos corrected and abbreviation defined; Page 5, Table 1 caption revised and typos corrected; Page 16 typos corrected

Published
2024

4. Approximating Langevin Monte Carlo with ResNet-like Neural Network architectures

Author

Miranda, Charles, Schütte, Janina, Sommer, David, and Eigel, Martin

Subjects
Computer Science - Machine Learning, Mathematics - Probability, Mathematics - Statistics Theory, Statistics - Machine Learning
Abstract

We sample from a given target distribution by constructing a neural network which maps samples from a simple reference, e.g. the standard normal distribution, to samples from the target. To that end, we propose using a neural network architecture inspired by the Langevin Monte Carlo (LMC) algorithm. Based on LMC perturbation results, we show approximation rates of the proposed architecture for smooth, log-concave target distributions measured in the Wasserstein-$2$ distance. The analysis heavily relies on the notion of sub-Gaussianity of the intermediate measures of the perturbed LMC process. In particular, we derive bounds on the growth of the intermediate variance proxies under different assumptions on the perturbations. Moreover, we propose an architecture similar to deep residual neural networks and derive expressivity results for approximating the sample to target distribution map.

Published
2023

7. Less interaction with forward models in Langevin dynamics

Author

Eigel, Martin, Gruhlke, Robert, and Sommer, David

Subjects
Mathematics - Numerical Analysis, Mathematics - Dynamical Systems, 65N21, 62F15, 65N75, 65C30, 35Q84, 65K10
Abstract

Ensemble methods have become ubiquitous for the solution of Bayesian inference problems. State-of-the-art Langevin samplers such as the Ensemble Kalman Sampler (EKS), Affine Invariant Langevin Dynamics (ALDI) or its extension using weighted covariance estimates rely on successive evaluations of the forward model or its gradient. A main drawback of these methods hence is their vast number of required forward calls as well as their possible lack of convergence in the case of more involved posterior measures such as multimodal distributions. The goal of this paper is to address these challenges to some extend. First, several possible adaptive ensemble enrichment strategies that successively enlarge the number of particles in the underlying Langevin dynamics are discusses that in turn lead to a significant reduction of the total number of forward calls. Second, analytical consistency guarantees of the ensemble enrichment method are provided for linear forward models. Third, to address more involved target distributions, the method is extended by applying adapted Langevin dynamics based on a homotopy formalism for which convergence is proved. Finally, numerical investigations of several benchmark problems illustrates the possible gain of the proposed method, comparing it to state-of-the-art Langevin samplers.

Published
2022

8. Decomposition of Industrial Systems for Energy Efficiency Optimization with OptTopo

Author

Thiele, Gregor, Johanni, Theresa, Sommer, David, and Krüger, Jörg

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

The operation of industrial facilities is a broad field for optimization. Industrial plants are often a) composed of several components, b) linked using network technology, c) physically interconnected and d) complex regarding the effect of set-points and operating points in every entity. This leads to the possibility of overall optimization but also to a high complexity of the emerging optimization problems. The decomposition of complex systems allows the modeling of individual models which can be structured according to the physical topology. A method for energy performance indicators (EnPI) helps to formulate an optimization problem. The optimization algorithm OptTopo achieves efficient set-points by traversing a graph representation of the overall system.

Published
2022

9. Entangling Solid Solutions: Machine Learning of Tensor Networks for Materials Property Prediction

Author

Sommer, David E. and Dunham, Scott T.

Subjects
Condensed Matter - Materials Science, Physics - Computational Physics
Abstract

Progress in the application of machine learning techniques to the prediction of solid-state and molecular materials properties has been greatly facilitated by the development state-of-the-art feature representations and novel deep learning architectures. A large class of atomic structure representations based on expansions of smoothed atomic densities have been shown to correspond to specific choices of basis sets in an abstract many-body Hilbert space. Concurrently, tensor network structures, conventionally the purview of quantum many-body physics and quantum information, have been successfully applied in supervised and unsupervised learning tasks in computer vision and natural language processing. In this work, we argue that architectures based on tensor networks are well-suited to machine learning on Hilbert-space representations of atomic structures. This is demonstrated on supervised learning tasks involving widely available datasets of density functional theory calculations of metal and semiconductor alloys. In particular, we show that certain standard tensor network topologies exhibit strong generalizability even on small training datasets while being parametrically efficient. We further relate this generalizability to the presence of complex entanglement in the trained tensor networks. We also discuss connections to learning with generalized structural kernels and related strategies for compressing large input feature spaces., Comment: 21 pages, 29 figures

Published
2022

10. Dynamical low-rank approximations of solutions to the Hamilton-Jacobi-Bellman equation

Author

Eigel, Martin, Schneider, Reinhold, and Sommer, David

Subjects
Mathematics - Optimization and Control, 49L20, 49M37, 93-08, 93B52, 15A69
Abstract

We present a novel method to approximate optimal feedback laws for nonlinear optimal control based on low-rank tensor train (TT) decompositions. The approach is based on the Dirac-Frenkel variational principle with the modification that the optimisation uses an empirical risk. Compared to current state-of-the-art TT methods, our approach exhibits a greatly reduced computational burden while achieving comparable results. A rigorous description of the numerical scheme and demonstrations of its performance are provided.

Published
2021

11. Learning Numeric Optimal Differentially Private Truncated Additive Mechanisms

Author

Sommer, David M., Abfalterer, Lukas, Zingg, Sheila, and Mohammadi, Esfandiar

Subjects
Computer Science - Cryptography and Security, Computer Science - Machine Learning
Abstract

Differentially private (DP) mechanisms face the challenge of providing accurate results while protecting their inputs: the privacy-utility trade-off. A simple but powerful technique for DP adds noise to sensitivity-bounded query outputs to blur the exact query output: additive mechanisms. While a vast body of work considers infinitely wide noise distributions, some applications (e.g., real-time operating systems) require hard bounds on the deviations from the real query, and only limited work on such mechanisms exist. An additive mechanism with truncated noise (i.e., with bounded range) can offer such hard bounds. We introduce a gradient-descent-based tool to learn truncated noise for additive mechanisms with strong utility bounds while simultaneously optimizing for differential privacy under sequential composition, i.e., scenarios where multiple noisy queries on the same data are revealed. Our method can learn discrete noise patterns and not only hyper-parameters of a predefined probability distribution. For sensitivity bounded mechanisms, we show that it is sufficient to consider symmetric and that\new{, for from the mean monotonically falling noise,} ensuring privacy for a pair of representative query outputs guarantees privacy for all pairs of inputs (that differ in one element). We find that the utility-privacy trade-off curves of our generated noise are remarkably close to truncated Gaussians and even replicate their shape for $l_2$ utility-loss. For a low number of compositions, we also improved DP-SGD (sub-sampling). Moreover, we extend Moments Accountant to truncated distributions, allowing to incorporate mechanism output events with varying input-dependent zero occurrence probability., Comment: Code is available at https://github.com/teuron/optimal_truncated_noise

Published
2021

12. System identification of a hysteresis-controlled pump system using SINDy

Author

Thiele, Gregor, Fey, Arne, Sommer, David, and Krüger, Jörg

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

Hysteresis-controlled devices are widely used in industrial applications. For example, cooling devices usually contain a two-point controller, resulting in a nonlinear hybrid system with two discrete states. Dynamic models of systems are essential for optimizing such industrial supply technology. However, conventional system identification approaches can hardly handle hysteresis-controlled devices. Thus, the new identification method Sparse Identification of Nonlinear Dynamics (SINDy) is extended to consider hybrid systems. SINDy composes models from basis functions out of a customized library in a data-driven manner. For modeling systems that behave dependent on their own past as in the case of natural hysteresis, Ferenc Preisach introduced the relay hysteron as an elementary mathematical description. In this new method (SINDyHybrid), tailored basis functions in form of relay hysterons are added to the library which is used by SINDy. Experiments with a hysteresis controlled water basin show that this approach correctly identifies state transitions of hybrid systems and also succeeds in modeling the dynamics of the discrete system states. A novel proximity hysteron achieves the robustness of this method. The impacts of the sampling rate and the signal noise ratio of the measurement data are examined accordingly.

Published
2020

13. Towards Probabilistic Verification of Machine Unlearning

Author

Sommer, David Marco, Song, Liwei, Wagh, Sameer, and Mittal, Prateek

Subjects
Computer Science - Cryptography and Security, Computer Science - Machine Learning, Statistics - Machine Learning
Abstract

The right to be forgotten, also known as the right to erasure, is the right of individuals to have their data erased from an entity storing it. The status of this long held notion was legally solidified recently by the General Data Protection Regulation (GDPR) in the European Union. Consequently, there is a need for mechanisms whereby users can verify if service providers comply with their deletion requests. In this work, we take the first step in proposing a formal framework to study the design of such verification mechanisms for data deletion requests -- also known as machine unlearning -- in the context of systems that provide machine learning as a service (MLaaS). Our framework allows the rigorous quantification of any verification mechanism based on standard hypothesis testing. Furthermore, we propose a novel backdoor-based verification mechanism and demonstrate its effectiveness in certifying data deletion with high confidence, thus providing a basis for quantitatively inferring machine unlearning. We evaluate our approach over a range of network architectures such as multi-layer perceptrons (MLP), convolutional neural networks (CNN), residual networks (ResNet), and long short-term memory (LSTM), as well as over 5 different datasets. We demonstrate that our approach has minimal effect on the ML service's accuracy but provides high confidence verification of unlearning. Our proposed mechanism works even if only a handful of users employ our system to ascertain compliance with data deletion requests. In particular, with just 5% of users participating, modifying half their data with a backdoor, and with merely 30 test queries, our verification mechanism has both false positive and false negative ratios below $10^{-3}$. We also show the effectiveness of our approach by testing it against an adaptive adversary that uses a state-of-the-art backdoor defense method., Comment: code is available at https://github.com/inspire-group/unlearning-verification

Published
2020

15. Cyber-Risks in Paper Voting

Author

Sommer, David M., Schneider, Moritz, Gut, Jannik, and Capkun, Srdjan

Subjects
Computer Science - Cryptography and Security
Abstract

Paper ballot voting with its fully-reviewable paper-trail is usually considered as more secure than their e-voting counterparts, given the large number of recent incidents. In this work, we explore the security of paper voting and show that paper voting, as it is implemented today, is surprisingly vulnerable to cyber-attacks. In particular, the aggregation methods of preliminary voting results of various countries rely on insecure communication channels like telephone, fax or non-secure e-mail. Furthermore, regulations typically do not mandate the use of secure channels for the transmission of preliminary results. We illustrate that preliminary results, despite their temporary nature, may have a severe impact on real-world decisions during the 3 to 30 days window until the final results are declared. An attacker exploiting this discrepancy can, e.g., benefit from stock market manipulation or call into question the legitimacy of the elections. This work investigates the cyber-risks in paper voting in a systematic manner by reviewing procedures in several countries (Estonia, France, Germany, the United Kingdom, and the United States of America) and through a comprehensive case-study of Switzerland. We examine the transmission systems currently in use through inquires from election officials. Moreover, we illustrate the feasibility of attacks by analyzing the frequent historical discrepancies between preliminary and final results. Considering our results and recent reports about easily modifiable preliminary results in Germany and the Netherlands, we conjecture similar weaknesses in other countries as well.

Published
2019

18. Earnings management before mergers and acquisitions: Evidence from the U.S. property‐casualty insurance industry.

Author

Che, Xin, He, Enya, Sommer, David W., and Xie, Xiaoying

Subjects
MERGERS & acquisitions, INSURANCE reserves, EARNINGS management, TARGET acquisition, DUE diligence, CONSERVATISM (Accounting)
Abstract

This paper examines the earnings management behavior of target insurers before mergers and acquisitions by investigating their reserving conservatism compared to control insurers. Contrary to the expectation that acquisition targets would manipulate their earnings to increase acquisition premiums, we find that target insurers are generally more conservative in their loss reserving practices before acquisitions than control firms. This finding provides support for the effectiveness of due diligence and the contractual risk shifting arguments, and the result holds regardless of whether acquirers are insurers or non‐insurers. Furthermore, we discover that target loss reserve conservatism is negatively associated with target CEO turnover post‐acquisition. In line with existing literature, we also find evidence suggesting that targets involved in stock acquisitions tend to adopt a less conservative reserving strategy than in deals that do not include stock payments. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Atomistic models of In and Ga diffusion in Cu(In,Ga)Se2.

Author

Gehrke, Aaron S., Sommer, David E., and Dunham, Scott T.

Subjects
*COPPER, *MONTE Carlo method, *DENSITY functional theory, *GALLIUM alloys, *BINDING energy, *ACTIVATION energy
Abstract

To improve the performance of Cu(In,Ga)Se2 thin-film photovoltaic devices, a robust understanding of the dominant diffusion pathways of the alloy species In and Ga is needed. Here, the most probable defect complexes and mechanisms for In and Ga diffusion are identified with the aid of density functional theory. The binding energies and migration barriers for these complexes are calculated in bulk CuInSe2 and CuGaSe2. Analytic models and kinetic lattice Monte Carlo simulations are employed to predict the diffusivity of In and Ga under variations in composition and temperature. We find that a model based on coulombic interactions between group III antisites and vacancies on the Cu-sublattice produces results that match well with experiment. [ABSTRACT FROM AUTHOR]

Published
2023
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21. Atomistic models of In and Ga diffusion in Cu(In,Ga)Se2.

Author

Gehrke, Aaron S., Sommer, David E., and Dunham, Scott T.

Subjects
COPPER, MONTE Carlo method, DENSITY functional theory, GALLIUM alloys, BINDING energy, ACTIVATION energy
Abstract

To improve the performance of Cu(In,Ga)Se2 thin-film photovoltaic devices, a robust understanding of the dominant diffusion pathways of the alloy species In and Ga is needed. Here, the most probable defect complexes and mechanisms for In and Ga diffusion are identified with the aid of density functional theory. The binding energies and migration barriers for these complexes are calculated in bulk CuInSe2 and CuGaSe2. Analytic models and kinetic lattice Monte Carlo simulations are employed to predict the diffusivity of In and Ga under variations in composition and temperature. We find that a model based on coulombic interactions between group III antisites and vacancies on the Cu-sublattice produces results that match well with experiment. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Hacking in the Blind: (Almost) Invisible Runtime UI Attacks on Safety-Critical Terminals

Author

Malisa, Luka, Kostiainen, Kari, Knell, Thomas, Sommer, David, and Capkun, Srdjan

Subjects
Computer Science - Cryptography and Security
Abstract

Many terminals are used in safety-critical operations in which humans, through terminal user interfaces, become a part of the system control loop (e.g., medical and industrial systems). These terminals are typically embedded, single-purpose devices with restricted functionality, sometimes air-gapped and increasingly hardened. We describe a new way of attacking such terminals in which an adversary has only temporary, non-invasive, physical access to the terminal. In this attack, the adversary attaches a small device to the interface that connects user input peripherals to the terminal. The device executes the attack when the authorized user is performing safety-critical operations, by modifying or blocking user input, or injecting new input events. Given that the attacker has access to user input, the execution of this attack might seem trivial. However, to succeed, the attacker needs to overcome a number of challenges including the inability to directly observe the user interface and avoid being detected by the users. We present techniques that allow user interface state and input tracking. We evaluate these techniques and show that they can be implemented efficiently. We further evaluate the effectiveness of our attack through an online user study and find input modification attacks that are hard for the users to detect and would therefore lead to serious violations of the input integrity.

Published
2016

25. Charged black holes in Horava gravity

Author

Janiszewski, Stefan, Karch, Andreas, Robinson, Brandon, and Sommer, David

Subjects
High Energy Physics - Theory
Abstract

We explore static spherically symmetric black hole solutions allowing a bulk U(1) vector field in the khronometric formulation of Horava gravity by way of Einstein-Aether. We examine analytic solutions and study numerical results in the limit that the khronon does not backreact on the metric., Comment: 16 pages, 4 figures

Published
2014
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28. Less Interaction with Forward Models in Langevin Dynamics: Enrichment and Homotopy.

Author

Eigel, Martin, Gruhlke, Robert, and Sommer, David

Subjects
BAYESIAN field theory, BENCHMARK problems (Computer science), EQUATIONS
Abstract

Ensemble methods have become ubiquitous for the solution of Bayesian inference problems. State-of-the-art Langevin samplers such as the ensemble Kalman sampler (EKS) or the affine invariant Langevin dynamics (ALDI) rely on successive evaluations of the forward model or its gradient. A main drawback of these methods hence is their vast number of required forward calls as well as their possible lack of convergence in the case of more involved posterior measures such as multimodal distributions. The goal of this paper is to address these challenges to some extent. First, several possible adaptive ensemble enrichment strategies that successively enlarge the number of particles in the underlying Langevin dynamics are discussed that in turn lead to a significant reduction of the total number of forward calls. Second, analytical consistency guarantees of the ensemble enrichment method are provided for linear forward models. Third, to address more involved target distributions, the method is extended by applying adapted Langevin dynamics based on a homotopy formalism for which convergence is proved. Finally, numerical investigations of several benchmark problems illustrate the possible gain of the proposed method, comparing it to state-of-the-art Langevin samplers. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Hacking in the Blind: (Almost) Invisible Runtime User Interface Attacks

Author

Malisa, Luka, Kostiainen, Kari, Knell, Thomas, Sommer, David, Capkun, Srdjan, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Fischer, Wieland, editor, and Homma, Naofumi, editor

Published
2017
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38. Understanding copper diffusion in CuInSe2 with first-principles based atomistic and continuum models.

Author

Sommer, David E. and Dunham, Scott T.

Subjects
*DIFFUSION, *COPPER, *DENSITY functional theory, *POINT defects, *DEPTH profiling, *DIFFUSION coefficients, *PHASE diagrams
Abstract

We investigate the diffusion of copper in CuInSe 2 using thermodynamic and kinetic models based on density functional theory calculations, attempting to reconcile large differences in reported experimental diffusivities. We find that observations of rapid chemical diffusion can be explained by large thermodynamic factors, which we calculate using a compositionally constrained model of intrinsic point defect formation. We further characterize how copper diffusion coefficients depend on material synthesis conditions and exhibit their variation across the CuInSe 2 secondary phase diagram. In doing so, we identify stable off-stoichiometries that are dominated by either vacancy- or interstitial-mediated diffusion mechanisms. These results are employed in the development of a continuum reaction–diffusion model, which we use to simulate experimental depth profiles. [ABSTRACT FROM AUTHOR]

Published
2021
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39. EOG feature relevance determination for microsleep detection

Author

Golz Martin, Wollner Sebastian, Sommer David, and Schnieder Sebastian

Subjects
automatic relevance determination, microsleep, electrooculography, support-vector machines, Medicine
Abstract

Automatic relevance determination (ARD) was applied to two-channel EOG recordings for microsleep event (MSE) recognition. 10 s immediately before MSE and also before counterexamples of fatigued, but attentive driving were analysed. Two type of signal features were extracted: the maximum cross correlation (MaxCC) and logarithmic power spectral densities (PSD) averaged in spectral bands of 0.5 Hz width ranging between 0 and 8 Hz. Generalised learn-ing vector quantisation (GRLVQ) was used as ARD method to show the potential of feature reduction. This is compared to support-vector machines (SVM), in which the feature reduction plays a much smaller role. Cross validation yielded mean normalised relevancies of PSD features in the range of 1.6 – 4.9 % and 1.9 – 10.4 % for horizontal and vertical EOG, respectively. MaxCC relevancies were 0.002 – 0.006 % and 0.002 – 0.06 %, respectively. This shows that PSD features of vertical EOG are indispensable, whereas MaxCC can be neglected. Mean classification accuracies were estimated at 86.6±b 1.3 % and 92.3±b 0.2 % for GRLVQ and SVM, respectively. GRLVQ permits objective feature reduction by inclusion of all processing stages, but is not as accurate as SVM.

Published
2017
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44. Oxythyrea dulcis Reitter 1899

Author

Král, David, Šípek, Petr, Sommer, David, and Vondráček, Dominik

Subjects
Coleoptera, Insecta, Arthropoda, Oxythyrea, Animalia, Biodiversity, Cetoniidae, Oxythyrea dulcis, Taxonomy
Abstract

Oxythyrea dulcis Reitter, 1899 (Figs. 2C–D, 3B, 3D, 4D–F) Oxythyrea dulcis Reitter, 1899: 48 (original description). Oxythyrea dulcis: Schenkling 1921: 200 (catalogue); Winkler 1929: 1121 (catalogue); Petrovitz 1958: 96 (distribution, biology), 1959: 129 (distribution); Medvedev 1964: 115 (monograph, key); Tauzin 2000: 85 (distribution); Smetana 2006: 298 (catalogue); Keith & Makris 2008: 27 (distribution); Bezděk 2016: 389 (catalogue); Vondráček et al. 2018: 417 (larval morphology, biology); Vondráček et al. 2023: 2 (diversity, habitat preferences, conservation); Schoolmeesters 2023 (online catalogue). Oxythyrea dulcis dulcis: Mikšić 1978: 69 (diagnosis, distribution); Sabatinelli 1981: 56 (review, key, biology); Mikšić 1982a: 67 (key distribution); Mikšić 1982b: 36 (monograph, key); Baraud 1992: 820 (monograph, key); Krajcik 1998: 69 (catalogue); Keith 2001: 95 (distribution, biology); Tauzin 2015: 118 (review, distribution). Oxythyrea borchmanni Schein, 1958: 93 (original description). Type locality: “Asteri und Elos bei Skala, Marathea bei Gythion [=Asteri, ca 36°49’54”N 22°41’55”E and Elos, ca 36°49’49”N 22°41’52”E nr. Skala; Marathea, ca 36°44’03”N 22°29’21”E nr. Gythion”; synonymized by Mikšić 1982a: 67). Oxythyrea goetzi Muche, 1962: 33 (original description). Type locality: “In de Nähe des Ortes Manavgat am Golf von Anatayla (Adalia) [= Turkey, Manavgat env., ca 36°45’54”N 31°23’57”E]”; synonymized by Mikšić 1982a: 67. Type locality. “ Olymp [= Greece, Mount Olympus, ca 40°05’19”N 22°21’32”E]”. Published records. Greece: Schenkling (1921): “Olymp”; Winkler (1929): “Olymp”; Schein (1958): “Asteri and Elos nr. Skala, Marathea nr. Gythion”; Petrovitz (1958): “Gythion, Kreta, Olymp, Rhodos (Lindos)”; Petrovitz (1959): “Rhodos”; Medvedev (1964): “ Peloponnesos, Rhodos”; Sabatinelli (1981): “ Peloponeso, Creta, Rodi”; Mikšić (1982a): “Olymp, Asteri bei Skala-Elos, Gythion-Lakonia, Kreta, Rhodos-Lindos”; Mikšić (1982b): “Asteri bei Skala-Elos; Peloponesos: Gythion, Laconia; Kreta; Rhodos: Lindos”; Baraud (1992): “Grèce (Olympe, loc type); Crète; Rhodes”; Keith & Makris (2008): “Andros Island, Chora”; Krajcik (1998): “Olymp”; Tauzin (2000): “Mont Olympe, Peloponnese (Elos, Gythra [= Gythion], Crète, Rhodes”; Keith (2001): “Mont Olympe, Litohoron, Rhodes, Crète ”; Smetana (2006): “Greece”; Tauzin (2015): “Gréce continental, de l’Ile de Rhodes, de l’Ile de Crete, de l’Ile d’Andros”; Bezděk (2016): “Greece”; Vondráček et al. (2018): “ Thessaly, Mount Ossa, village Stomio, N°39.867, E°22.733; Stomio, Beach, at sea level, N°39.8761111, E°22.7313889”; Byk et al. (2022): “Greece”; Vondráček et al. (2023): “Asteri bei Skala; Elos; Marathea bei Gytheion; West Kreta; Nordküste, Georgioupoli; Saloniki; Stomio, beach, ca sea level; Limnos isl., Gomati sand dunes, sea shore, ca 5 m; Crete, Phalasarna (seashore), 10m; Creta, Kasteh (Kissamu), 10 m; Creta, Khania, 20 m; Rhodos, Lindos”; Schoolmeesters (2023): “Greece”. Asian part of Turkey: Petrovitz (1958): “ Mersina ”; Muche (1962): “Manavgat”; Medvedev (1964): “ Mersin ”; Sabatinelli (1981): “Turchia del villaiet di Mersin ”; Mikšić (1982a): “Kleinasien”; Mikšić (1982b): “Manavgat, Erdemli”; Baraud (1992): “Anatolie”; Tauzin (2000): “Ephèse, Selçuk (Izmir)”; Keith (2001): “ Mersin, Izmir; Izmir: plage de Pamuçak, plage de Gümüldür, Antalya: plage de Patara)”; Smetana (2006): “Asian part of Turkey”; Tauzin (2015): “Turquie d’Anatolie”; Bezděk (2016): “Asian part of Turkey”; Byk et al. (2022): “Turkey”; Vondráček et al. (2023): “Erdemli; Izmir, Ozbere”; Schoolmeesters (2023): “Turkey”. Syria [?]: Mikšić (1982b): “?Syrien”. Type material examined. Oxythyrea borchmanni Schein, 1958: Holotypus (♁) (ZFMK), “ Griechenland 1956 | Asteri bei Skala—| Elos 23.–25.4.|| Fr. Borchmann leg. | Eingang Nr. 8, 1956 [p] || Paratypus [p] | Oxyth. dulcis Rtt. | v. Borchmanni n.v. [hw] | H. Schein 1955 [p.] || Oxythyrea | dulcis | Reitter, 1899 | David Král det. 2023”; Paratypus (♁) (ZFMK),“ Griechenland 1956 | Marathea bei | Gythion 21.–22.4 || Fr. Borchmann leg. | Eingang Nr. 8,1956 || MUSEUM KOENIG BONN [p] || Paratypus [p] | Oxyth. dulcis R. | v. Borchmanni n. v. [hw] | H. Schein 1955 [p]” (see Fig. 7). Additional material examined. Greece: 1 ♁ (NMPC), Crete, Prevelikloster bei Südküste, 400 m, 26.iv.1992, auf Blüten, J. Burtscher lgt.; 1 ♁ (NMPC), Crete, Agios Nikolaos, 23.iv.1971, Wewalka lgt.; 1 ♀ (NMPC), Macedonia, Asprovalta env., Nea Kerdilia, litoral-seaside, 11.v.2011, Z. Malinka lgt.; 1 ♁, 5 ♀♀ (NMPC), Crete, Phalasarna (seashore), 35°30ʼ18”N 23°34ʼ34”E, ca. 10m, 18.–19.iv.2018, L. Hrůzová, D. Král & D. Sommer lgt.; 1 ♁ (NMPC), N Crete, Petras riv., 23.v.2002, Z. Kletečka lgt.; 2 ♁♁, 1 ♀ (NMPC), Thessaloniki pr., Aspróvalta, 12.v.2001, D. Král lgt.; 2 ♁♁ (NMPC), Limnos, Gomati sand dunes, 39°59.3’N 25°09.1’E, ca. 5 m, sea shore, 24.iv.2007, J. Hájek lgt.; 4 ♁♁, 5 ♀♀ (NMPC), Thessaly, Mount Ossa, village Stomio, N °39.867, E°22.733, Stomio, beach, at sea level, 13.–20.vi.2014, H. Podskalská & P. Šípek lgt.; 12 ♁♁, 52 ♀♀ (CUPC, LHCP, NMPC, DSCP, SJCP), Stomio beach, 39°52ʼ34”N 22°43ʼ53”E, ca. sea level, O. Kouklík, D. Král, P. Šípek & D. Vondráček lgt.; 4 ♁♁, 6 ♀♀ (ZFMK), Asteri bei Skala—Elos, 23.–25.iv.1956, Fr. Borchmann lgt.; 1 ♀ (ZFMK), Marathea bei Gythion, 21.–22.iv.1956, Fr. Borchmann lgt.; 1 ♀ (ZFMK), Westkreta, Ostküste, Georgiopouli, 28.iv.1992, E. Rössner lgt.; 1 ♁ (ZFMK), Saloniki, 24.iv.1968, H. Roer lgt.; 2 unsexed spec. (OHCB), Githio Strand, 21.iv.2004, D. Keith lgt.; 2 unsexed spec. (OHCB), Crete, W Chania, Dramia Strand, 14.v.2014, Heise lgt. Asian part of Turkey: 4 ♁♁, 4 ♀♀ (ZFMK), Anatolie, Erdemli, Petrovitz & Ressl lgt. Diagnosis. Body (Figs. 2C–D, 3B) remarkable robust, enlarged, and rounded; dorsal surface sparsely but distinctly setaceous; dorsal surface totally black without metallic lustre. Pronotum (Figs. 2C, 3B) remarkably setaceous with 4–6 (rarely only with basal pair) whitish spots in two longitudinal rows; lateral margin as a rule with narrow whitish stripe, in some specimens this stripe broken into three irregularly shaped spots. Scutellum surface (Fig. 3D) completely smooth, very rarely finely microscultured basally. Elytra with several rounded whitish spots, more or less equal in size, not connected to each other (Figs. 2C, 3B). Pygidium with six whitish spots. Male with triangular whitish spots on the middle of visible abdominal ventrite 1 and 2 and rarely with additional one whitish spot on visible abdominal ventrites 3 and 4 (Fig. 2D). These spots absent in females. Abdomen ventrally on each side with three short whitish lines and more distally with two longer whitish lines in male (Fig. 2D), one such longer line in female. Lamina exterior of parameres relatively stout in lateral aspect (Fig. 4D–F); lamina interior of parameres relatively wide, tip at less sharp angle in dorsofrontal aspect (Fig. 4D–F). Distribution. Greece (Aegean coast of Greece, includig islands Andros, Crete, Limnos, and Rhodes), Asian part of Turkey and an unverified occurrence in “ Syria ” without precise data based on Mikšić (1982b). For details see Fig. 6., Published as part of Král, David, Šípek, Petr, Sommer, David & Vondráček, Dominik, 2023, Resurrection of Oxythyrea abigailoides Mikšić, 1978 (Coleoptera: Scarabaeidae: Cetoniinae) based on new morphological, morphometrical and molecular data, pp. 561-574 in Zootaxa 5301 (5) on pages 566-570, DOI: 10.11646/zootaxa.5301.5.3, http://zenodo.org/record/8036225, {"references":["Reitter, E. (1899) Bestimmungs-Tabelle der Melolonthidae aus der europaischen Fauna und den angrenzenden Landern, enthaltend die Gruppen der Dynastini, Euchirini, Pachypodini, Cetonini, Valgini und Trichiini. Verhandlungen des Naturforschenden Vereins in Brunn, 37, 21 - 111. [1898]","Schenkling, S. (1921) Scarabaeidae: Cetoniinae. In: Junk, W. & Schenkling, S. (Eds.), Coleopterorum Catalogus. Pars 72. W. Junk Publishers, The Hague, 47 pp.","Winkler, A. (1929) s. n. In: Lamellicornia. Catalogus Coleopterorum regionis palaearcticae, Pars 9. A. Winkler, Wien, pp. 1009 - 1136. [1924 - 1929]","Petrovitz, R. (1958) Oxythyrea dulcis Reitter, eine strandbewohnende Cetonide. Deutsche Entomologische Zeitschrift, Neue Folge, 5, 96 - 97.","Medvedev, S. I. (1964) Plastinchatousyie (Scarabaeidae). Podsem. Cetoniinae, Valginae. Fauna SSSR. Zhestkokrylye. Tom X. Vyp. 5. [Lamellicornia (Scarabaeidae). Subfam. Cetoniinae, Valginae. Fauna SSSR. Beetles. Vol. X. Part 5]. Nauka, Moskva, Leningrad, 374 + 2 (unpaginated) pp. [in Russian]","Tauzin, P. (2000) Coleopteres Scarabaeoidea de Turquie: Premiere note. Le Coleopteriste, 39, 81 - 86.","Smetana, A. (2006) Subfamily Cetoniinae. In: Lobl, I. & Smetana, A. (Eds.), Catalogue of Palaearctic Coleoptera. Vol. 3. Scarabaeoidea - Scirtoidea - Dasciloidea - Buprestoidea - Byrrhoidea. Brill E. J., Leiden, pp. 283 - 313.","Keith, D. & Makris, C. (2008) Confirmation of Oxythyrea abigail Reiche & Saulcy from Cyprus Island and record of O. dulcis from Andros Island (Coleoptera: Scarabaeidae: Cetoniinae). Kogane, 9, 27 - 28.","Bezdek, A. (2016) Subfamily Cetoniinae. In: Lobl, I. & Lobl, D. (Eds.), Catalogue of Palaearctic Coleoptera. Vol. 3. Scarabaeoidea - Scirtoidea - Dasciloidea - Buprestoidea - Byrrhoidea. Revised and Updated edition. Brill E. J., Leiden, pp. 367 - 412.","Vondracek, D., Hadjiconstantis, M. & Sipek, P. (2018) Immature stages of the genus Oxythyrea (Coleoptera: Scarabaeidae: Cetoniinae) with a key to third instar larvae, and notes on the biology of the genus. Zootaxa, 4486 (4), 401 - 434. https: // doi. org / 10.11646 / zootaxa. 4486.4.1","Vondracek, D., Kral, D. & Sipek, P. (2023) Cryptic diversity of Oxythyrea flower chafers and its implication for conservation of non-forest biotopes in the Balkans. Insect Conservation and Diversity, 16, 133 - 146. https: // doi. org / 10.1111 / icad. 12612","Schoolmeesters, P. (2023) World Scarabaeidae Database. In: Banki, O., Roskov, Y., Doring, M., Ower, G., Vandepitte, L., Hobern, D., Remsen, D., Schalk, P., DeWalt, R. E., Keping, M., Miller, J., Orrell, T., Aalbu, R., Abbott, J., Adlard, R., Adriaenssens, E. M., Aedo, C., Aescht, E., Akkari, N. et al., Catalogue of Life Checklist. Version 6 February 2023. https: // doi. org / 10.48580 / dfrq- 38 g","Miksic, R. (1978) Eine weiterer Beitrag zur Kenntnis der jugoslawischen Oxythyrea - Arten (Coleoptera, Scarabaridae, Cetoniinae). Acta Entomologica Jugoslavica, 14, 69 - 71.","Sabatinelli, G. (1981) Le Oxythyrea Muls. del Mediterraneo: Studi morfologici sistematici (Coleoptera, Scarabaeoidea). Fragmenta Entomologica, 16, 45 - 60.","Miksic, R. (1982 a) Eine vorlaufige Ubersicht und Bestimmungstabelle der Cetoniinae der Balkanlander (Coleoptera, Lamellicornia, Scarabaeidae). Entomologische Abhandlungen des Staatliches Museum fur Tierkunde in Dresden, 45, 65 - 89.","Miksic, R. (1982 b) Monographie der Cetoniinae der Palaarktischen und Orientalischen Region. Coleoptera, Lamellicornia. Band 3. Systematischer Teil. Cetoniini I Teil. Forstinstitut in Sarajevo, Sarajevo, 530 pp., 14 pls.","Baraud, J. (1992) Coleopteres Scarabaeoidea d'Europe. Faune de France 78. Federation Francaise des Societes de Sciences Naturelles & Societe Linneenne de Lyon, Lyon, 856 pp. https: // doi. org / 10.3406 / linly. 1992.11007","Krajcik, M. (1998) Cetoniidae of the World. Catalogue - Part I. (Coleoptera: Cetoniidae). Typos Studio Most, Most, 132 pp.","Keith, D. (2001) Contribution a la connaissance des Scarabaeoidea du Proche et du Moyen Orient (7 e note). Observations sur Oxythyrea dulcis Reitter, 1898 (Col. Cetoniidae). Cetoniimania, 1, 95 - 97.","Tauzin, P. (2015) Liste synonymique des especes palearctiques du genre Oxythyrea Mulsant, 1842 et precision sur Oxythyrea albopicta (Motschulsky, 1845) (Coleoptera, Cetoniinae, Leucocelina). Le Coleopteriste, 18, 114 - 124.","Schein, H. (1958) Cetoniiden aus der Sammelreise des Museums Alexander Koenig in Bonn nach Griechenland 1956 (Coleoptera). Deutsche Entomologische Zeitschrift, Neue Folge, 5, 91 - 95.","Muche, W. H. (1962) Oxythyrea gotzi nov. spec. (Coleopt., Cetoninae). Reichenbachia, 1, 33 - 35.","Petrovitz, R. (1959) Beitrag zur Scarabaeidae-Fauna der Insel Rhodos. Bolletino del Laboratorio di Enomologia Agraria \" Filippo Silvestri \" Portici, 17, 124 - 130.","Byk, A., Bidas, M., Gazurek, T., Marczak, D., Minkina, L. & Tylkowski, S. (2022) New data on the occurrence of Sacarabaeoid beetles (Coleoptera: Scarabaeoidea) in Montenegro. Insects, 13, 352. https: // doi. org / 10.3390 / insects 13040352"]}

Published
2023
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45. Oxythyrea abigailoides Miksic 1978

Author

Král, David, Šípek, Petr, Sommer, David, and Vondráček, Dominik

Subjects
Coleoptera, Insecta, Arthropoda, Oxythyrea, Animalia, Oxythyrea abigailoides, Biodiversity, Cetoniidae, Taxonomy
Abstract

Oxythyrea abigailoides Mikšić, 1978, resurrected species (Figs. 2A–B, 3A, 3C, 4A–C) Oxythyrea dulcis abigailoides Mikšić, 1978: 69 (original description). Oxythyrea dulcis abigailoides: Sabatinelli 1981: 56 (review, key, biology); Mikšić 1982a: 67 (key, distribution), 1982b: 38 (monograph, key); Baraud 1992: 820 (monograph, key); Keith 2001: 95 (distribution); Nikčević 2010: 46 (distribution, conservation); Tauzin 2015: 118 (review, distribution). Oxythyrea abigail Reiche & Saulcy, 1856: Mikšić 1977: 41 (key, distribution, biology). Oxythyrea abigailoides (as a junior subjective synonym to O. dulcis): Krajcik 1998: 70 (catalogue); Smetana 2006: 298 (catalogue); Bezděk 2016: 389 (catalogue); Vondráček et al. 2018: figs. 15f–h (habitat preferences); Byk et al. 2022: 13 (distribution); Vondráček et al. 2023: 2 (diversity, habitat preferences, conservation); Schoolmeesters 2023 (online catalogue). Type locality. “Vom “ Grossen Sandstrand ” bei Ulcinj an der Küste der Crna Gora [= Montenegro, Ulcinj env., Velika Plaža beach, ca 41°53’55”N 19°17’47”E]”. Published records. Montenegro: Mikšić (1977): “Auf dem “Grossen Sandstrand” gegen 5 km südöstlich von Ulcinj im Küstenland der Crna Gora ”; Sabatinelli (1981): “ Montenegro ”; Mikšić (1982a): “Grosser Sandstrand bei Ulcinj, Crna Gora ”; Mikšić (1982b): “Grosser Sandstrand bei Ulcinj, Crna Gora ”; Baraud (1992): “littoral de Crna Gora (Ulcinj, loc. Type)”; Keith (2001): “ Monténégro ”; Krajcik (1998): “ Crna Gora ”; Smetana (2006): “ Yugoslavia (Crna Gora)”; Tauzin (2015): “ Crna Gora (Monténégro)”; Bezděk (2016): “ Montenegro ”; Vondráček et al. (2018): “ Montenegro ”; Vondráček et al. (2023): “Ulcinj Municip., central part of Velika Plaža near Ulcinj and Doni Štoj, ca sea level”; Byk et al. (2022): “Bojana at Ulcinj”; Schoolmeesters (2023): “ Montenegro ”. Greece: Vondráček et al. (2018): “ Greece: Peloponnese, Phalasarna, Kaiafa”; Vondráček et al. (2023): “NW Zacharo, Kaiafa lake (seashore), 4 m; W of Gialova, Gialova lagoon (sea shore), 4m ”. Type material examined. Montenegro: Holotype (♁) (CNHM) “ MONTENEGRO | ULCINJ | VELIKA PLAŽA | MIKŠIĆ 2. V.[19]77 [hw] || HOLOTYPUS [red, p] || OXYTHYREA | DULCIS RTT. | S. ABIGAILOIDES NOV. [blue, hw, Mikšić’s hand] | | Miksic det., 19 [p] 79 [blue, hw, Mikšić’s hand] | 600:ZAG;ZEC1 | 1590. | coll. Mikšić [p]” (see Fig. 5). Allotype ♀ and 27 unsexed paratypes (CNHM), same data as in holotype. Additional material examined. Montenegro: 5 ♁♁, 2 ♀♀ (CUPC, NMPC), Ulcinj Municipality, central part of Velika Plaza near Ulcinj and Doni Štoj, 41°53’37.53”N 19°17’36.87”E, ca. sea level, 17.–18.v.2016, J. Kadlec, P. Šípek & D. Vondráček lgt. Greece: 18 ♁♁, 8 ♀♀ (CUPC, DSCP, LHCP, NMPC, SJCP), NW of Zacharo, Kaiafa lake (seashore), 37°29’59”N 21°36’20”E, 4 m, 15.iv.2018, L. Hrůzová, D. Král & D. Sommer lgt.; 34 unsexed spec. (ZSMC, ex. coll. Hillert), the same data but O. Hillert lgt.; 3 ♁♁ (NMPC), W of Gialova, Gialova lagoon (seashore), 36°57’25”N 21°40’21”E, 10 m, 15.iv.2018, L. Hrůzová, D. Král & D. Sommer lgt. Diagnosis. Body (Figs. 2A–B, 3A) remarkable robust, enlarged, and rounded; dorsal surface sparsely but distinctly setaceous; dorsal surface totally black without metallic lustre. Pronotum (Figs. 2A, 3A) remarkably setaceous with 4–6 (rarely only with basal pair) whitish spots in two longitudinal rows; lateral margin as a rule with three distinctly separated spots from each other on each side, rarely with interrupted white lines consisting of three semicontiguous spots. Scutellum surface (Fig. 3C) finely shallowly microsculptured. Elytra with several rounded whitish spots, more or less equal in size, not connected to each other (Figs. 2A, 3A). Pygidium with six whitish spots. Male with triangular whitish spots at middle of visible abdominal ventrite 1 and 2 and rarely with additional one whitish spot on visible abdominal ventrites 3 and 4 (Fig. 2B). These spots absent in females.Abdomen ventrally on each side with three short whitish lines and more distally with two longer whitish lines in male (Fig. 2B), one such longer line in female. Lamina exterior of parameres relatively tinny in lateral aspect (Fig. 4A–C); lamina interior relatively narrow, tip at sharper angle in dorsofrontal aspect (Fig. 4A–C). Differential diagnosis. Based on our examination of adult beetles a morphological differential diagnosis of O. abigailoides, resurrected species, from O. dulcis is summarized below in Table 1. Distribution. Greece (Ionian coast of Peloponnesos) and Montenegro. For details see Fig. 6., Published as part of Král, David, Šípek, Petr, Sommer, David & Vondráček, Dominik, 2023, Resurrection of Oxythyrea abigailoides Mikšić, 1978 (Coleoptera: Scarabaeidae: Cetoniinae) based on new morphological, morphometrical and molecular data, pp. 561-574 in Zootaxa 5301 (5) on pages 563-566, DOI: 10.11646/zootaxa.5301.5.3, http://zenodo.org/record/8036225, {"references":["Miksic, R. (1978) Eine weiterer Beitrag zur Kenntnis der jugoslawischen Oxythyrea - Arten (Coleoptera, Scarabaridae, Cetoniinae). Acta Entomologica Jugoslavica, 14, 69 - 71.","Sabatinelli, G. (1981) Le Oxythyrea Muls. del Mediterraneo: Studi morfologici sistematici (Coleoptera, Scarabaeoidea). Fragmenta Entomologica, 16, 45 - 60.","Miksic, R. (1982 a) Eine vorlaufige Ubersicht und Bestimmungstabelle der Cetoniinae der Balkanlander (Coleoptera, Lamellicornia, Scarabaeidae). Entomologische Abhandlungen des Staatliches Museum fur Tierkunde in Dresden, 45, 65 - 89.","Baraud, J. (1992) Coleopteres Scarabaeoidea d'Europe. Faune de France 78. Federation Francaise des Societes de Sciences Naturelles & Societe Linneenne de Lyon, Lyon, 856 pp. https: // doi. org / 10.3406 / linly. 1992.11007","Keith, D. (2001) Contribution a la connaissance des Scarabaeoidea du Proche et du Moyen Orient (7 e note). Observations sur Oxythyrea dulcis Reitter, 1898 (Col. Cetoniidae). Cetoniimania, 1, 95 - 97.","Nikcevic, J. (2010) Some ecological data of Coleoptera in a beach dunes system of long Ulcinj beach in Montenegro. Natura Montenegrina, 10, 41 - 48.","Tauzin, P. (2015) Liste synonymique des especes palearctiques du genre Oxythyrea Mulsant, 1842 et precision sur Oxythyrea albopicta (Motschulsky, 1845) (Coleoptera, Cetoniinae, Leucocelina). Le Coleopteriste, 18, 114 - 124.","Miksic, R. (1977) Oxythyrea abigail Reiche - eine fur Europa und Jugoslawien neue Cetoniinae-Art. Acta Entomologica Jugoslavica, 13, 41 - 44.","Krajcik, M. (1998) Cetoniidae of the World. Catalogue - Part I. (Coleoptera: Cetoniidae). Typos Studio Most, Most, 132 pp.","Smetana, A. (2006) Subfamily Cetoniinae. In: Lobl, I. & Smetana, A. (Eds.), Catalogue of Palaearctic Coleoptera. Vol. 3. Scarabaeoidea - Scirtoidea - Dasciloidea - Buprestoidea - Byrrhoidea. Brill E. J., Leiden, pp. 283 - 313.","Bezdek, A. (2016) Subfamily Cetoniinae. In: Lobl, I. & Lobl, D. (Eds.), Catalogue of Palaearctic Coleoptera. Vol. 3. Scarabaeoidea - Scirtoidea - Dasciloidea - Buprestoidea - Byrrhoidea. Revised and Updated edition. Brill E. J., Leiden, pp. 367 - 412.","Vondracek, D., Hadjiconstantis, M. & Sipek, P. (2018) Immature stages of the genus Oxythyrea (Coleoptera: Scarabaeidae: Cetoniinae) with a key to third instar larvae, and notes on the biology of the genus. Zootaxa, 4486 (4), 401 - 434. https: // doi. org / 10.11646 / zootaxa. 4486.4.1","Byk, A., Bidas, M., Gazurek, T., Marczak, D., Minkina, L. & Tylkowski, S. (2022) New data on the occurrence of Sacarabaeoid beetles (Coleoptera: Scarabaeoidea) in Montenegro. Insects, 13, 352. https: // doi. org / 10.3390 / insects 13040352","Vondracek, D., Kral, D. & Sipek, P. (2023) Cryptic diversity of Oxythyrea flower chafers and its implication for conservation of non-forest biotopes in the Balkans. Insect Conservation and Diversity, 16, 133 - 146. https: // doi. org / 10.1111 / icad. 12612","Schoolmeesters, P. (2023) World Scarabaeidae Database. In: Banki, O., Roskov, Y., Doring, M., Ower, G., Vandepitte, L., Hobern, D., Remsen, D., Schalk, P., DeWalt, R. E., Keping, M., Miller, J., Orrell, T., Aalbu, R., Abbott, J., Adlard, R., Adriaenssens, E. M., Aedo, C., Aescht, E., Akkari, N. et al., Catalogue of Life Checklist. Version 6 February 2023. https: // doi. org / 10.48580 / dfrq- 38 g","Miksic, R. (1982 b) Monographie der Cetoniinae der Palaarktischen und Orientalischen Region. Coleoptera, Lamellicornia. Band 3. Systematischer Teil. Cetoniini I Teil. Forstinstitut in Sarajevo, Sarajevo, 530 pp., 14 pls.","Reitter, E. (1899) Bestimmungs-Tabelle der Melolonthidae aus der europaischen Fauna und den angrenzenden Landern, enthaltend die Gruppen der Dynastini, Euchirini, Pachypodini, Cetonini, Valgini und Trichiini. Verhandlungen des Naturforschenden Vereins in Brunn, 37, 21 - 111. [1898]"]}

Published
2023
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46. Entyposis frici (Coleoptera, Scarabaeidae, Melolonthinae), a new species from Somaliland

Author

Bezdek, Ales, Sehnal, Richard, Elmi, Hassan S.A., Sommer, David, and Král, David

Subjects
taxonomy, Ethiopian region, Horn of Africa, Description, Scarabaeoidea, Schizonychini
Abstract

Entyposis frici Bezděk & Sehnal, sp. nov., from Somaliland is described and relevant diagnostic characters are illustrated. The new species is compared with the morphologically closely similar Entyposis Kolbe, 1894 species. An updated checklist and an identification key to northeastern African Entyposis species are provided.

Published
2023

47. Strukturelle Metall-Kunststoff-Direktfügeverbindungen - Einfluss der Oberflächenstrukturierung auf die Verbundfestigkeit.

Author

Hesselbach, Julian, Laugwitz, Christian, Hochleitner, Gernot, Kraus, Eduard, Förster, Benjamin, Langer, Maurice, Sommer, David, and Hellmann, Ralf

Subjects
TENSION loads, SURFACE structure, STRENGTH of materials, BOND strengths, SUBSTRATES (Materials science)
Abstract

Copyright of Joining Plastics / Fügen von Kunststoffen is the property of DVS Media GmbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024

50. Larval morphology of Phaeochroops rattus (Coleoptera Hybosoridae) and historical overview of known preimaginal stages of the family.

Author

HRŮZOVÁ, Lucie, KRÁL, David, SOMMER, David, and ŠÍPEK, Petr

Abstract

Here we report the finding of the immature stages of Phaeochroops rattus Arrow 1909 in a dead fallen tree in Malaysia. A detailed and illustrated description of the last instar larval morphology is provided and their morphology is compared with larval morphology of other genera of the subfamily Hybosorinae. The trilobate labrum of P. rattus larvae is unique among the entire family, as well as the remarkable combination of spindle-form pretarsi and antennae with fused antennomeres III and IV but without the sensorium of antennomere III. The larvae fed on decaying wood, which is the second record of saproxylophagy in the entire family. A complete list of so far described immature stages of the entire family Hybosoridae is provided. [ABSTRACT FROM AUTHOR]

Published
2023

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