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Since 2010, when 129 Odonata species were known from the Delmarva Peninsula, the authors and others have continued annual field surveys to update faunal records. Discovery of nine previously unrecorded species brings the total to 138 (44 Zygoptera, 94 Anisoptera). In this update we provide a more detailed status of the newly observed and rarer species of the Delmarva Peninsula. Included are the distributions of many of the more common species with additional information about rare, uncommon, and vagrant species that have been vetted from photographic observations submitted to iNaturalist, Odonata Central, and the Maryland Biodiversity Project. Here we report the species currently known from the Delmarva Peninsula and summarize notable records, with observations and expected species up to the end of the 2023 field season. [ABSTRACT FROM AUTHOR]

Colombian odonatological history was scarce until two decades ago. Here, we present an updated, thoroughly vetted, and refined checklist of taxonomic and geographical records of Colombian odonates, built upon the previous publication in 2011. To achieve this, we conducted an extensive literature review, and curated the most representative biological collections of odonates in the country. Our goal was to integrate new records and recently described species, while excluding misidentifications or doubtful identifications due to a lack of support from taxonomic revisions and specimens in collections. We report a total of 536 species, reflecting a 38% increase in odonate richness since the last published checklist in 2011. This number positions Colombia among the top ten countries with the highest number of odonates worldwide. We include important taxonomic details for each species in the checklist, the availability of female and/or larva description(s), and the IUCN species assessment. We also highlight rare or puzzling species, which records for the country are controversial. It is noteworthy that the majority of these contributions stem from local Colombian research efforts that have enriched our national reference collections, including ANDES-E, CEUA, and UARC. Geographically, the department with the highest diversity is Meta with 205 species followed by Antioquia with 170 species. The latter holds the highest number of endemics across the country. We anticipate that this effort will be the basis and inspiration to future research on Colombian odonatofauna, especially in underexplored areas, and will encourage conservation initiatives for freshwater ecosystems across the country. [ABSTRACT FROM AUTHOR]

Último estadio larvario de Neocordulia volxemi (Selys, 1874) (Odonata, Libelluloidea) del sureste del Brasil. Neocordulia es un género neotropical que comprende 16 especies distribuidas en América del Sur y América Central. Hasta la fecha, solo se han descrito siete larvas de este género. En este artículo describimos el último estadio larvario de Neocordulia volxemi (Selys, 1874), recogida en la zona de protección ambiental de la cuenca del río Uberaba en el estado de Minas Gerais, en el Brasil. Se encontraron adultos de color verde metálico volando en una zona forestal de una unidad de conservación, mientras que la larva se encontró en una cascada rodeada de paredes rocosas. La zona, que es un vestigio de Cerrado, se encuentra actualmente amenazada por pastos degradados y el aumento de los monocultivos.

During summer 2019, I searched for Tanypteryx hageni (Black Petaltail) populations in the upper Umpqua River Basin of western Oregon, USA. In particular, I wanted to find exuviae and nymph burrows to confirm successful reproduction at particular locations. During the course of the summer, I learned to interpret likely burrow habitat from Google satellite imagery, which helped me more efficiently locate breeding sites. Presence of narrow bands of surface water and associated wetland plants created subtle, often somewhat sinuous patterns discernible in satellite imagery. I present a series of photos to illustrate the patterns in satellite imagery as well as ground-level images of habitat at four study locations. [ABSTRACT FROM AUTHOR]

The final-instar larva of Psaironeura tenuissima is described based on reared specimens from Amazonas and Pará states in the Brazilian Amazon. Psaironeura larvae are grouped with Neoneura and Protoneura larvae by having nodated caudal lamellae, however, they can be differentiated by the number of labial palp setae. Psaironeura tenuissima are morphologically compared with P. angeloi larvae as well as those of Neoneura kiautai and Protoneura aurantiaca. The P. tenuissima larva can be distinguished from that of P. angeloi by the shape of the superior margin of prementum, projections on the prothorax, caudal lamellae apex shape, and the number of setae in the paraproct ventral margin setae. [ABSTRACT FROM AUTHOR]

RESUMO As denominações atribuídas à libélula, – inseto de corpo comprido e fino, com quatro asas transparentes, que voa e bate a traseira na água – Questão 85 do QSL do Atlas Linguístico do Brasil, representam exemplarmente o complexo sistema variacional do léxico do português brasileiro (PB), refletindo fatos da sócio-história de cada região e, até mesmo, de cada localidade e de cada indivíduo. As variantes registradas no ALiB, publicado em 2014, com os dados das capitais, sugerem que a denominação do inseto é, em geral, de base metafórica, motivada pelo seu aspecto físico, som, movimentos e, igualmente, por associações mentais/analogias com outros semelhantes, resultando, na maioria dos casos, em signos transparentes. A fim de ratificar ou, talvez, retificar os resultados das capitais, analisamos, neste trabalho, os dados coletados no interior do país junto a 900 informantes, perfazendo o total de 225 localidades. Com o apoio desse corpus, norteadas pelos princípios teórico-metodológicos da Lexicografia e da Semântica, objetivamos: (i) verificar a dicionarização das formas obtidas; (ii) descrever as variantes quanto aos aspectos morfológicos; e (iii) analisar essas denominações sob a ótica da semântica motivacional.

Progomphus integer es una de las cuatro especies de Gomphidae endémicas de las Antillas Mayores, reportada para República Dominicana en referencias del siglo pasado. Más recientemente, se sugirió que su presencia en La Hispaniola era dudosa, debido a que no se reportaban localidades específicas. En este trabajo, se confirma la presencia de la especie para el país. Además, se aportan las primeras citas de localidades, con algunas notas de los hábitats donde fue colectada.

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Erythemis Hagen, 1861 shows a considerable variation in genitalic characters, body coloration and wing venation. Since it is known that these traits are affected by different kinds of selection that probably blur their phylogenetic signal, we chose the genus Erythemis as a model taxon to analyze and compare the phylogenetic signal of these and other morphologic characters. A cladistic analysis was performed using ten species of the genus plus another seventeen species of Libellulidae as outgroup. Characters were defined following standard criteria and were managed using the software DELTA. Tree search was performed with the software NONA. Partitioned and combined analyses were conducted. Character tracking of characters with ri=100 was used to identify synapomorphies. In agreement with the literature, color characters provided strong phylogenetic signal, meanwhile, genitalia characters offered no synapomorphies. We did not find any character that could support the monophyly of Erythemis. The only clade that has strong support from the morphologic set of characters is (E. vesiculosa, (E. simplicicollis, E. collocata)). Contrary to the results found in other Odonata, wing characters offered synapomorphies for some Erythemis clades.

En los trabajos de campo para la elaboración del Plan de Conservación del Lugar de Importancia Comunitaria Ríos Ega-Urederra (ES ES2200024) se localizó una hembra joven de Gomphus vulgatissimus L., 1758 en la población de Ancín (Navarra, N Península Ibérica).

Navicordulia aemulatrix sp. nov. (holotype male deposited in MZSP: Brazil, Santa Catarina State, [São Bento do Sul municipality, 26°14'58"S, 49°22'59"W], [railroad station] Rio Vermelho, II.1952) is described and illustrated based on three males. The long cercus (2.9-3.2 mm) places this species in the longistyla-group together with N. kiautai, N. longistyla and N. nitens but it differs from them mainly by the shape of cercus, with carinated part occupying 0.33 of cercus total length, and also by dorsal, ventro-medial and ventro-lateral tubercles developed. An unusual process on tergal portion of prothorax is reported for the first time in Navicordulia. The rate of description of new species of South American 'Corduliidae' is discussed. A map with records of Atlantic Forest Navicordulia species and a list of Brazilian corduliids by state are also presented.

Várias estações de piscicultura que trabalham com a produção de alevinos ou peixes ornamentais têm apresentado problemas relacionados à predação de larvas, pós-larvas e alevinos por ninfas de insetos da Ordem Odonata. Dessa forma, objetivou-se fazer um levantamento de espécies de odonatos presentes em tanques de criação de peixes em dois municípios da região centro-oeste de Minas Gerais, assim como avaliar o efeito de Bacillus thuringiensis var. israelensis de Barjac sobre ninfas de Pantala flavescens (Fabricius, 1798) (Odonata: Libellulidae). Durante um período de três meses, foram realizadas coletas quinzenais, sendo os insetos adultos capturados com o auxílio de redes entomológicas e as ninfas, através de peneiras de malha fina, acopladas a cabos de madeira. As ninfas capturadas foram levadas para o laboratório onde foram individualizadas em caixas de isopor com capacidade para 2L, vedadas em sua extremidade superior com filó. Logo após a emergência dos adultos, esses foram mortos, acondicionados em envelopes e enviados para serem identificados. Os experimentos laboratoriais foram conduzidos em sala climatizada à 25 ± 2°C, UR de 70 ± 10% e fotofase de 12 horas. Ninfas de segundo ínstar de P. flavescens foram individualmente acondicionadas em caixas de isopor contendo cada uma 500mL de água livre de cloro e, estando essas no terceiro, quinto e sétimo ínstares, foram tratadas com B. thuringiensis var. israelensis, através do produto microbiano Vectobac®, em formulação granulada. O produto foi aplicado diretamente na água do recipiente de criação, em concentração indicada para o controle de larvas de culicídeos, duas concentrações superiores e duas inferiores a essa, além da testemunha, na qual não se aplicou o produto. As avaliações foram realizadas a 24, 48 e 72 horas após a aplicação do produto, registrando-se o número de insetos mortos em cada tratamento. Em ambos os experimentos, as ninfas foram alimentadas com larvas de mosquito da Família Culicidae e peixes recém-nascidos da espécie Poecilia cf. vivípara (Schneider, 1801). Foram identificadas as seguintes espécies: Ischnura fluvialis Selys, 1876; Aphylla theodorina (Navas, 1933); Brachymesia furcata (Hagen, 1861); Erythrodiplax fusca (Rambur, 1842); Miathyria marcella (Selys, 1857); Micrathyria almeidai Santos, 1945; Micrathyria hesperis Ris, 1911; Orthemis discolor (Burmeister, 1839); Perithemis mooma Kirby, 1889 e P. flavescens. Não houve efeito significativo do produto microbiano sobre a espécie estudada

Copyright of Caldasia is the property of Universidad Nacional de Colombia 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.)

Copyright of Biota Neotropica is the property of Biota Neotropica 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.)

Understanding the risk of extinction of a single population is an important problem in both theoretical and applied ecology. Local extinction risk depends on several factors, including population size, demographic or environmental stochasticity, natural catastrophe, or the loss of genetic diversity. The probability of local extinction may also be higher in low-quality sink habitats than in high-quality source habitats. We tested this hypothesis by comparing local extinction rates of 15 species of Odonata (dragonflies and damselflies) between 1930–1975 and 1995–2003 in central Finland. Local extinction rates were higher in low-quality than in high-quality habitats. Nevertheless, for the three most common species there were no differences in extinction rates between low- and high-quality habitats. Our results suggest that a good understanding of habitat quality is crucial for the conservation of species in heterogeneous landscapes. [ABSTRACT FROM AUTHOR]

Copyright of Biota Neotropica is the property of Biota Neotropica 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.)

Copyright of Biota Neotropica is the property of Biota Neotropica 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.)