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Family PAGUROPSIDAE n. fam. urn:lsid:zoobank.org:act: 88399E62-3864-4B66-8D89-FC32C562F5A9 TYPE GENUS. ��� Paguropsis Henderson, 1888. OTHER GENERA INCLUDED. ��� Eopaguropsis Fraaije, Krzemiński, Van Bakel. Krzemińska & Jagt, 2012 and Paguropsina Lemaitre, Rahayu & Komai, 2018 (Fig. 11). ETYMOLOGY. ��� The name is derived from the type genus. DIAGNOSIS. ��� Prominent subtriangular rostrum, considerably exceeding lateral projections.Cervical and branchial grooves subparallel, encompassing small branchial regions (= lateral lobes) or forming broad, sinuous groove. Shield well calcified, subtriangular or subrectangular; dorsal surface slightly vaulted with incomplete midline crest; welldelineated massetic region covered with numerous setal pits; posterior carapace less calcified, delineated cardiac region; uropods and telson symmetrical. Chelipeds subequal, similar in armature and setation., Published as part of Fraaije, Ren�� H. B., Van Bakel, Barry W. M., Jagt, John W. M., Charbonnier, Sylvain, Schweigert, Guenter, Garcia, G��raldine & Valentin, Xavier, 2022, The evolution of hermit crabs (Crustacea, Decapoda, Anomura, Paguroidea) on the basis of carapace morphology: a state-of-the-art-report, pp. 1-16 in Geodiversitas 44 (1) on page 12, DOI: 10.5252/geodiversitas2022v44a1, http://zenodo.org/record/5834191, {"references":["HENDERSON J. R. 1888. - Scientific results of the exploratory voyage of HMS Challenger (Zoology), in Report on the Anomura collected by H. M. S. Challenger during the years 1873 - 1876 27: 1 - 221. HMSO, Edinburgh. https: // www. biodiversitylibrary. org / page / 2007958","LEMAITRE R., RAHAYU D. L. & KOMAI T. 2018. - A revision of \" blanket-hermit crabs \" of the genus Paguropsis Henderson, 1888, with the description of a new genus and five new species (Crustacea, Anomura, Diogenidae). ZooKeys 752: 17 - 97. https: // doi. org / 10.3897 / zookeys. 752.23712"]}

Family PROBEEBEIDAE Boone, 1926, emended herein Probeebeidae Boone, 1926b: 73. TYPE GENUS. ��� Probeebei (Boone, 1926) by monotypy. OTHER GENERA INCLUDED. ��� Labidochirus Benedict, 1892, Tisea Morgan & Forest, 1991 and Tylaspis Henderson, 1885. DIAGNOSIS. ��� Shield (excluding rostrum) strongly convex, well calcified, width equal to length or width exceeding length, with distinct bulges (i.e., keraial and massetic regions) laterally, strong to weaker spinose ornament. Rostrum well developed, exceeding lateral projections. Cervical and branchial grooves subparallel, encompassing small branchial regions. Posterolateral margins spinose. Posterior carapace well calcified, broadly inflated, with dense spinose ornamentation. Well-developed cardiac grooves encompassing cardiac region. REMARKS. ��� The bulges on the shield of extant probeebeids (Fig. 10) are quite similar to those of the most basal paguropsid, Eopaguropsis nidiaquilae (see Fraaije et al. 2012c: figs 2c; 3), which also has a spinose ornamentation on the gastric and lateral parts of the shield., Published as part of Fraaije, Ren�� H. B., Van Bakel, Barry W. M., Jagt, John W. M., Charbonnier, Sylvain, Schweigert, Guenter, Garcia, G��raldine & Valentin, Xavier, 2022, The evolution of hermit crabs (Crustacea, Decapoda, Anomura, Paguroidea) on the basis of carapace morphology: a state-of-the-art-report, pp. 1-16 in Geodiversitas 44 (1) on page 11, DOI: 10.5252/geodiversitas2022v44a1, http://zenodo.org/record/5834191, {"references":["BOONE L. 1926 b. - A new family of Crustacea. Preliminary technical description. New York Zoological Society Bulletin 29: 73.","BENEDICT J. E. 1892. - Preliminary descriptions of thirty-seven new species of hermit crabs of the genus Eupagurus in the U. S. National Museum. Proceedings of the United States National Museum 15: 1 - 26. https: // doi. org / 10.5479 / si. 00963801.15 - 887.1","MORGAN G. J. & FOREST J. 1991. - A new genus and species of hermit crab (Crustacea, Anomura, Diogenidae) from the Timor Sea, north Australia. Bulletin du Museum national d'histoire naturelle, 4 eme serie, Section A: Zoologie, biologie et ecologie animales 13 (1 - 2). https: // www. biodiversitylibrary. org / page / 59053247","HENDERSON J. R. 1885. - Diagnoses of new species of Galatheidae collected during the \" Challenger \" expedition. Annals and Magazine of Natural History (ser. 5) 16: 407 - 421.","FRAAIJE R. H. B., KRZEMINSKI W., VAN BAKEL B. W. M., KRZEMINSKA E. & JAGT J. W. M. 2012 c. - The earliest record of a diogenid hermit crab from the Late Jurassic of the southern Polish Uplands, with notes on paguroid carapace terminology. Acta Palaeontologica Polonica 57: 655 - 660. https: // doi. org / 10.4202 / app. 2011.0052"]}

We study distinguishing information in the context of quantum interference involving more than one parametric downconversion (PDC) source and in the context of polarization-entangled photon pairs based on PDC. We arrive at specific design criteria for two-photon sources so that when used as part of complex optical systems, such as photon-based quantum information processing schemes, distinguishing information between the photons is eliminated guaranteeing high visibility interference. We propose practical techniques which lead to suitably engineered two-photon states that can be realistically implemented with available technology. Finally, we study an implementation of the nonlinear-sign shift (NS) logic gate with PDC sources and show the effect of distinguishing information on the performance of the gate., 23 pages, 13 figures. submitted to Quantum Information & Computation

Paguristes liwinskii n. sp. (Fig. 1 C) Diagnosis. Cross section of right cheliped transversely oval; dorsal and ventral sides convex, with regular, dense cover of forwardly directed, fine tubercles, largest arranged in row along dorsal outer side and along central proximal inner side; fixed finger short, stout and triangular; dactylus short and triangular, about twice length of fixed finger. Etymology. Named in honour of the mayor of Annopol, Mr Wiesław Liwiński, who facilitated large-scale excavations conducted in this area in recent years by a team led by the last author (for details, see Machalski & Kennedy 2013 and Popov & Machalski 2014). Type. The holotype, and sole specimen known (ZPAL Cr. 9 / 43), is a near-complete right palm with fixed finger and dactylus, measuring 10 mm in length, and 7 mm in greatest width. Locality and stratigraphy. Kopiec near Annopol, lower part of unit 3 (Fig. 1 A), upper upper Albian. Unit 3, c. 50 cm thick, is composed of quartz sand with abundant glauconite, passing gradually upwards into quartzglauconitic marl. A distinct bed of phosphatic clasts and fossils occurs in the upper part of unit 3. Its upper boundary is sharp, whereas the lower boundary is diffuse due to bioturbation (Marcinowski & Walaszczyk 1985). The phosphatic clasts are c. 10 mm in diameter, but in the upper part of the layer they commonly form larger aggregates, up to 120 mm in diameter. Unit 3 of the Annopol succession is dated on the basis of specifically indeterminate specimens of the ammonite Mortoniceras (Subschloenbachia), preserved as attachment scars on the left valves of some oysters (Machalski and Kennedy 2013). These specimens are closest to Mortoniceras (Subschloenbachia) that characterise the upper upper Albian Mortoniceras perinflatum Zone. Description. Globose right cheliped, cross section transversely oval; convex dorsal and ventral sides; all sides with regular, dense cover of forwardly directed, fine tubercles, largest in a row along dorsal outer and along central proximal inner sides. Fixed finger short, stout, curved, with a row of about four large setal pores on the inner and outer cutting edge and numerous irregular, longitudinal rows of finer pores on central and ventral parts; tip spatulate; cutting edge near-straight with concave central part. Dactylus short, triangular, curved, about twice the length of fixed finger; covered with irregular rows of setal pores smallest in dorsal half; tip pointed; strongly concave dorsal side here considered to be a preservational artefact, possibly resulting from unsuccessful predatory attack as some regeneration cuticle is visible on the proximal dorsal part of dactylus and the distal part of dorsal palm. Discussion. The generic placement of fossil paguroid chelae is difficult in that claws and, occasionally, meri and carpi are all that is preserved. The specimen studied has been assigned to Paguristes because the claws of Paguristes santamartaensis are remarkably similar and members of Paguristes tend to be isochelous, whereas most other diogenid genera comprise species that are predominantly heterochelous with the left chela considerably larger. We have to keep in mind that the lefthandedness of most diogenids probably is the result of gastropod shell inhabitation, the great majority of marine snails being dextral. Fraaije (2003) noted a shift in molluscan inhabitation from ammonites to gastropods during the Cretaceous Period; this affected the morphology of hermit claws that ���blocked��� the aperture. It is also highly probable that Cretaceous species of Paguristes had isochelous chelae and that left heterochely mainly occurred subsequent to the Cretaceous/Paleogene boundary in relation to this shift in inhabitation. To date, about 120 extant species of Paguristes are on record (McLaughlin et al. 2010; Komai et al. 2015), illustrating that this genus is the most successful member of the Diogenidae by far. From the fossil record, Schweitzer et al. (2010) recorded a total of 15 species. Here, we list 17 species (Tab. 1), inclusive of the new form, which extends the stratigraphic range of Paguristes downwards into the late Albian by about 25 myr. Four of the listed species (P. santamartaensis, P. ouachitensis, P. whitteni and P. florae) are of late Late Cretaceous, eight (P. baldoensis, P. extentus, P. prealpinus, P. wheeleri, P. mexicanus, P. johnsoni, P. hokoensis and P. lineatuberculatus) of Paleogene, two (P. oligotuberculata and P. cserhatensis) of Neogene and two (P. cf. lymani and P. cf. syrtensis) of Quaternary age. Only one of these records, i.e., that of P. cf. syrtensis, is based on a fragmentary dorsal shield (see Garassino et al. 2014). Species Stratigraphic/geographic occurrence P. liwinskii sp. nov. upper Albian, Poland P. santamartaensis Feldmann, Tshudy & Thomson, 1993 upper Santonian/lower Campanian, Antarctica P. ouachitensis Rathbun, 1935 upper Campanian, USA P. whitteni Bishop, 1983 Maastrichtian, USA P. florae Collins, Fraaye & Jagt, 1995 upper Maastrichtian, the Netherlands ��� Belgium P. baldoensis Garassino, De Angeli & Pasini, 2009 Lower Eocene, Italy P. extentus Beschin, Busulini, De Angeli & Tessier, 2007 Lower Eocene, Italy P. prealpinus Beschin, De Angeli, Checchi & Zarantonello, 2005 Middle Eocene, Italy P. wheeleri Blow & Manning, 1996 Middle Eocene, USA P. mexicanus Vega, Cosma, Couti��o, Feldmann, Nyborg, Schweitzer & Waugh, 2001 Middle Eocene, Mexico P. johnsoni Rathbun, 1935 Eocene, USA P. hokoensis Schweitzer & Feldmann, 2001 Upper Eocene, USA P. oligotuberculatus M��ller & Collins, 1991 Upper Eocene, Hungary P. lineatuberculatus Beschin, De Angeli, Checchi & Mietto, 2006 Upper Eocene���Oligocene, Italy P. cserhatensis M��ller, 1984 Miocene, Hungary P. cf. lymani A. Milne-Edwards & Bouvier, 1893 Pleistocene, Jamaica P. cf. syrtensis de Saint Laurent, 1971 Pleistocene, Italy In overall shape and dense uniform ornamentation, Paguristes liwinskii sp. nov. most closely resembles P. santamartaensis, although the latter differs in having a smooth inner surface, a flattened dorsal surface and coarser tuberculation. The new species can be differentiated from P. ouachitaensis in that the palm has a convex inner side and transverse rows of tubercles are lacking. Paguristes whitteni has a much coarser ornament and a longer, strongly deflected fixed finger, while P. f l or a e is less globose, has fingers with a lesser curvature and the ornamentation is more subdued. Paguristes baldoensis and P. extensus are less convex, have straighter dorsal and ventral sides and much longer fingers, whereas P. prealpinus has a smoother inner surface and a much longer and downturned fixed finger. Paguristes lineatuberculatus has a different ornamentation and the distal tip of the fixed finger is directed downwards, whereas P. wheeleri shows a strongly curved occlusal surface and much coarser tubercles and spines on both sides. The ornamentation in P. mexicanus is less uniform, with a reticulate outer surface near the upper margin. Paguristes johnsoni can be differentiated in having a less globose palm, a longer fixed finger, and less dense and coarser ornamentation, while P. hokoensis has a significantly longer, downturned fixed finger and fewer, yet larger tubercles, arranged in longitudinal rows on the outer side of the manus. Paguristes cserhatensis is less globose, and has fewer, yet much larger tubercles arranged in longitudinal rows; in addition, the fixed finger has a lesser curvature. The outer surface of the palm in P. oligotuberculatus has only few rows of coarse tubercles and the dorsal margin is straight and spinose, while P. cf. lymani differs in showing a smoother inner surface, straighter dorsal and ventral margins. Moreover, it does not have a uniform ornamentation. Rathbun (1926: 101) described the preservation of the type and only known specimen of P. subequalis as follows, ��� [.....] so crumbly that no more can be uncovered without destroying it. Only the form of the fingers is seen, and in the case of the propodal finger, nothing but the impression.��� Paguristes chipolensis was erected by Rathbun (1935) on the basis of a single, incomplete dactylus and propodus. The preservation of both P. subequalis and P. chipolensis is so poor that a detailed comparison is impossible; we propose that they are best regarded as nomina dubia and recommend removal from decapod crustacean species lists., Published as part of Fraaije, Ren�� H. B., Van Bakel, Barry W. M., Jagt, John W. M. & Machalski, Marcin, 2015, A new hermit crab (Anomura, Paguroidea) from the upper Albian (Cretaceous) of Annopol, Poland, pp. 588-594 in Zootaxa 3955 (4) on pages 589-592, DOI: 10.11646/zootaxa.3955.4.9, http://zenodo.org/record/239809, {"references":["Machalski, M. & Kennedy, W. J. (2013) Oyster-bioimmured ammonites from the Upper Albian of Annopol, Poland: stratigraphic and palaeobiogeographic implications. Acta Geologica Polonica, 63, 545 - 554. http: // dx. doi. org / 10.2478 / agp- 2013 - 0024","Popov, E. V. & Machalski, M. (2014) Late Albian chimeroid fishes (Chimaeroidei) from Annopol, Poland. Cretaceous Research, 47, 1 - 18. http: // dx. doi. org / 10.1016 / j. cretres. 2013.09.011","Marcinowski, R. & Walaszczyk, I. (1985) Middle Cretaceous deposits and biostratigraphy of the Annopol section, Central Polish Uplands. Osterreichische Akademie der Wissenschaften, Schriftenreiche der Erdwissenschaftlichen Komisssionen, 7, 27 - 41.","McLaughlin, P. A., Komai, T., Lemaitre, R. & Rahayu, D. L. (2010) Annotated checklist of anomuran decapod crustaceans of the world (exclusive of the Kiwaoidea and families Chirostylidae and Galatheidae of the Galatheoidea). Part I - Lithodoidea, Lomisoidea and Paguroidea. The Raffles Bulletin of Zoology, 23 (Supplement), 5 - 107.","Komai, T., Reshmi, R. & Kumar, A. B. (2015) A new species of the hermit crab genus Paguristes Dana, 1851 (Crustacea: Decapoda: Anomura: Diogenidae) from southwestern India. Zootaxa, 3937 (3), 517 - 532. http: // dx. doi. org / 10.11646 / zootaxa. 3937.3.5","Schweitzer, C. E., Feldmann, R. M., Garassino, A., Karasawa, H. & Schweigert, G. (2010) Systematic list of fossil decapod crustacean species. Crustaceana Monographs, 10, i - viii + 1 - 221. http: // dx. doi. org / 10.1163 / ej. 9789004178915. i- 222","Garassino, A., Pasini, G., De Angeli, A. & Hyzny, M. (2014) The decapod fauna (Axiidea, Anomura, Brachyura) from the Late Pleistocene of Trumbaca, Reggio Calabria (Calabria, southern Italy). Natural History Sciences, Atti della Societa italiana di Scienze naturali del Museo civico di Storia naturale di Milano, 1 (2), 119 - 130. http: // dx. doi. org / 10.4081 / nhs. 2014.60","Feldmann, R. M., Tshudy, D. M. & Thomson, M R. A. (1993) Late Cretaceous and Paleocene decapod crustaceans from James Ross Basin, Antarctic Peninsula. The Paleontological Society Memoir, 28, 1 - 41.","Rathbun, M. J. (1935) Fossil Crustacea of the Atlantic and Gulf Coastal Plain. Geological Society of America, Special Paper, 2, 1 - 160. http: // dx. doi. org / 10.1130 / SPE 2 - p 1","Bishop, G. (1983) Fossil decapod Crustacea from the Late Cretaceous Coon Creek Formation, Union County, Mississippi. Journal of Crustacean Biology, 3, 417 - 430. http: // dx. doi. org / 10.2307 / 1548142","Collins, J. S. H., Fraaye, R. H. B. & Jagt, J. W. M. (1995) Late Cretaceous anomurans and brachyurans from the Maastrichtian type area. Acta Palaeontologica Polonica, 40, 165 - 210.","Garassino, A., De Angeli, A. & Pasini, G. (2009) In situ hermit crab (Crustacea, Anomura, Paguroidea from the Early Eocene (Ypresian) of NE Italy. Atti della Societa italiana di Scienze naturali del Museo civico di Storia naturale di Milano, 150 (II), 229 - 238.","Beschin, C., Busulini, A., De Angeli, A. & Tessier G. (2007) I decapodi dell'Eocene inferiore di Contrada Gecchelina (Vicenza - Italia settentrionale) (Anomura e Brachiura). Museo di Archeologia e Scienze Naturali ' G. Zannato ', Montecchio Maggiore (Vicenza), 2007, 9 - 76.","Beschin, C., De Angeli, A., Checchi, A. & Zarantonello, G. (2005) Crostacei eocenici di Grola di Cornedo Vicentino presso Spagnago (Vicenza, Italia settentrionale). Studi e Ricerche - Associazione Amici Museo civico ' G. Zannato', Montecchio Maggiore (Vicenza), 12, 5 - 35.","Blow, W. C. & Manning, R. B. (1996) Preliminary descriptions of 25 new decapod crustaceans from the Middle Eocene of the Carolinas, U. S. A. Tulane Studies in Geology and Paleontology, 29, 1 - 26.","Vega, F. J., Cosma, T., Coutino, M. A., Feldmann, R. M., Nyborg, T. G., Schweitzer, C. E. & Waugh, D. A. (2001) New Middle Eocene decapods (Crustacea) from Chiapas, Mexico. Journal of Paleontology, 75, 929 - 946. http: // dx. doi. org / 10.1666 / 0022 - 3360 (2001) 075 % 3 C 0929: NMEDCF % 3 E 2.0. CO; 2","Muller, P. & Collins, J. S. H. (1991) Late Eocene coral-associated decapods (Crustacea) from Hungary. Contributions to Tertiary and Quaternary Geology, 28, 47 - 92.","Beschin, C., De Angeli, A., Checchi, A. & Mietto, P. (2006) Crostacei del Priaboniano di Priabona (Vicenza - Italia settentrionale). Lavori - Societa Veneziana di Scienze Naturali, Venezia, 31, 95 - 112.","Muller, P. (1984) Decapod Crustacea of the Badenian. Geologica Hungarica, Series Palaeontologica, 42, 1 - 317.","Milne-Edwards, A. & Bouvier, E. L. (1893) Description des Crustaces de la famille des Paguriens recueillis pendant l'expedition. Reports of the results of dredging under the supervision of Alexander Agassiz in the Gulf of Mexico (1877 - 78) and along the Atlantic coast of the United States (1880) by the U. S. Survey steamer \" Blake, \" Lieut. - Com. S. D. Sigsbee and Commander J. R. Bartlett commanding. Memoirs of the Museum of Comparative Zoology, 14, 1 - 172. [Harvard]","Saint Laurent, M. de (1971) Paguristes syrtensis, espece nouvelle de cotes tunisiennes (Crustacea Decapoda Diogenidae). Bulletin du Museum national d'Histoire naturelle de Paris, Series 2, 42 (for 1970), 1009 - 1107.","Rathbun, M. J. (1926) The fossil stalk-eyed Crustacea of the Pacific Slope of North America. United States National Museum Bulletin, 138, i - vii + 1 - 155. http: // dx. doi. org / 10.5479 / si. 03629236.138. i"]}

In this paper a quaternionic sharp version of the Carath��odory theorem is established for slice regular functions with positive real part, which strengthes a weaken version recently established by D. Alpay et. al. using the Herglotz integral formula. Moreover, the restriction of positive real part can be relaxed so that the theorem becomes the quaternionic version of the Borel-Carath��odory theorem. It turns out that the two theorems are equivalent., arXiv admin note: text overlap with arXiv:1404.3117 by other authors

In the article the class of slice regular functions is shown to be closed under a new regular composition. The new regular composition turns out to be globally defined in contrast to the locally defined version by Vlacci. Its advantage over Vlacci's is demonstrated by its associated theory of composition operators and dynamical systems for slice regular functions. Especially, the corresponding Littlewood subordination principle and the Denjoy-Wolff type theorem can be established.

Gaudipluma n. gen. Type species. Gaudipluma bacamortensis n. gen., n. sp. Diagnosis. Carapace large; subrectangular, wider than long, maximum width posteriorly; carapace strongly compressed dorso-ventrally; orbits large, supraorbital margins markedly sinuous; front narrow, relatively long; lateral margins arched, with 2 marked raised lateral nodes; posterior margin convex, wider than orbitofrontal margin; dorsal surface flat in both directions, with 3 subtle, low ridges; thoracic sternum with sternites 3, 4 trapezoidal, sternites 5���7 subrectangular, sternites 6, 7 with prominent median line; sternite 8 inclined, reduced; vulvae subcircular, at extremities of sutures 5 / 6; male, female abdomens weakly differentiated, narrow; chelipeds subequal; P 2 ���P 4 long, with numerous spines; P 5 conspicuously reduced; dorsal surface with numerous large pits. Etymology. In honour of the Catalan architect Antoni Gaud�� (1852���1926), in allusion to the shape and ornament of the new taxon which is defined by sinuous lines, reminiscent of his works, plus the ending - pluma, which refers to the main character of the family. Remarks. The new genus can be differentiated from all others genera in the family Retroplumidae (see De Grave et al. 2009: 44) by a few unique dorsal and ventral characters. The dorsal ridges are fairly attenuated, lateral margins have two conspicuous lateral nodes, male and female abdomens are particularly narrow, the male abdominal segment 6 is long, sternite 7 is unusually large for the family, and distinctly long. Distinguishing features also include a dorsal surface which is densely covered by large pits and P 2 ���P 4 with numerous spines, characters never seen in any other retroplumid genera. Gaudipluma bacamortensis n. sp. (Figs. 3���4) Diagnosis. As for genus. Etymology. From Bacamorta, the name of the village from where the material originates. Material examined. MGSB 75283, holotype; MGSB 75284, 75285 a, b and 75286 a, b, paratypes; MAB k. 3282���3283, paratypes, all from the vicinity of Bacamorta (Huesca), of early Eocene (Ypresian) age. In the holotype, the maximum carapace width and length (in millimetres) are 39 and 30, respectively. Description. Carapace large (maximum carapace width about 40 mm); subrectangular in outline; wider than long, widest posteriorly, at level of metabranchial region. Dorsal surface flat in both directions, densely covered by large pits. Orbits large, supraorbital margins sinuous, median sinus projected anteriorly; supraorbital margins terminating in long outer-orbital spines. Front slender, directed anteriorly, relatively long. Lateral carapace margins broadly arched, with 2 conspicuously raised nodes, the first at level of epibranchial region, the second at metabranchial region; posterior margin convex, wider than orbitofrontal margin. Dorsal carapace surface crossed by 3 subtle ridges; anterior ridge continuous, sinuous; median ridge inclined (oblique), interrupted by gastric grooves; posterior ridge continuous. Mesobranchial region subcircular, bounded by subtle grooves. Epibranchial regions slightly swollen, inclined (oblique), interrupted by shallow gastric grooves. Cardiac region weakly defined, slightly raised, forming continuous faint ridge with swollen metabranchial region. Intestinal region depressed. Buccal frame large, subrectangular, mxp 3 with large, robust endopodite, narrow exopodite. Thoracic sternum wider than long, sternites 1, 2 subtriangular, small, sternites 3, 4 subtrapezoidal; strong, notable notch between sternites 3, 4; sternite 4 with conspicuous lateral projection; sternites 5���7 subrectangular, wide; sternite 7 longer than 5, 6; sternites 6, 7 with prominent median line; sternite 8 inclined, conspicuously reduced; vulvae subcircular, at extremities of sutures 5 / 6. Male, female abdomens narrow, sexual dimorphism weak, telson short, small in both sexes; female abdomen subelliptical to subtriangular, with rounded lateral margins, all segments separated; male abdomen subtriangular, with straight, inclined lateral margins; abdominal segment 6 conspicuously long, with clear lateral extensions; male abdominal segments 3���5 fused. Abdominal holding mechanism clearly indicated by lateral projections in sternite 5, lateral extensions of abdominal segment 6. Female vulvae at extremity of suture 5 / 6 (Fig. 4 F). P 5 subequal, dactyli with numerous small denticles. P 2 ���P 4 long, flattened dorso-ventrally, lateral sides with numerous spines. P 5 conspicuously reduced (Fig. 34 D, E). Dorsal carapace surface densely covered by large pits. Remarks. The main features of Gaudipluma bacamortensis n. gen., n. sp. match those attributed to other retroplumids (de Saint Laurent 1989: 111���112). Diagnostic features of the new taxon include the general shape of the carapace, large orbits with sinuous margins, narrow front, general shape of the thoracic sternum, with subtrapezoidal sternites 3, 4, rectangular sternites 5���7, an inclined and reduced sternite 8, female vulvae at the extremity of sutures 5 / 6, P 2 ���P 4 long and flattened; P 5 conspicuously reduced (Fig. 4 D, E). The similarly sized Retrocypoda almelai has a different dorsal surface, with more numerous and better defined dorsal ridges, much wider abdomens, with marked sexual dimorphism, a shorter abdominal segment 6 and longer telson (Via 1969: fig. 41). The female abdomen in Retrocypoda is conspicuously large, occupying a large portion of the ventral surface (Via 1969: pl. 38, fig. 4 b). Similar features are seen in Retropluma (see Beschin et al. 1996) as far as male and female abdomens are concerned. The dorsal carapace surface in Retropluma has more strongly marked, acute ridges. The male and female abdomens of Gaudipluma n. gen. are markedly narrow, and sexual dimorphism is weak. The male abdominal segment 6 is unusually long. The male and female telsons are short in the new genus. Serrablopluma n. gen., Loerentheya and Loerenthopluma all differ mainly in carapace size (smaller), general outline, the construction of the orbits, and all the specific features indicated in the discussion of Serrablopluma n. gen. The female abdomen in Serrablopluma n. gen., Loerenthopluma and Retrocypoda is fairly broad, with distinct sexual dimorphism (see Beschin et al. 1996). Costacopluma is characterised by a wide geographical distribution (America, Africa) and a long stratigraphic range (Coniacian���Eocene; see Beschin et al. 1996; Schweitzer et al. 2010). The ten species currently assigned to this genus exhibit a wide range of morphological features, with variable carapace sizes and shapes (subcircular to subelliptical to widely sub-rectangular or elongate). The main distinguishing features of Costacopluma are the stronger dorsal carapace areolation, shorter orbitofrontal margins, wider abdomens and more accentuated sexual dimorphism. The dorsal surfaces of the carapace are more convex and marginal angles are more rounded. The dorsal carapace regions are clearly separated; moreover, the front is much wider and the orbitofrontal margins much shorter (Schweitzer et al. 2003: fig. 16)., Published as part of Artal, Pedro, Van Bakel, Barry W. M., Fraaije, Ren�� H. B. & Jagt, John W. M., 2013, New retroplumid crabs (Crustacea, Brachyura, Retroplumidae Gill, 1894) from the Eocene of Huesca (Arag��n, Spain), pp. 343-352 in Zootaxa 3652 (3) on pages 348-351, DOI: 10.11646/zootaxa.3652.3.3, http://zenodo.org/record/221749

Serrablopluma n. gen. Type species. Serrablopluma diminuta n. sp. Diagnosis. Small size carapace, subtrapezoidal in outline, much wider than long, widest anteriorly, maximum width at position of lateral spines; anterior margin wide, broadly sinuous, terminating in fairly widely projecting lateral spines; front conspicuously reduced, narrow; orbits wide, with sub-orbital spine; lateral margins straight, inclined, converging posteriorly; posterior margin wide, broadly convex; dorsal carapace surface flat in both directions, with 3 strongly marked ridges; anterior ridge continuous, intersecting anterior margin; medium ridge interrupted only by gastric grooves; posterior ridge continuous, straight. Thoracic sternum broad; sternites 3, 4 trapezoidal, sternites 5���7 subrectangular; vulvae large, subcircular, situated below extremity of sutures 5 / 6; abdomen subtriangular in both sexes; female abdomen much broader than males; thoracic sternites, abdominal somites notably ridged; thoracic sternite 5, abdominal somite 6 with distinct abdominal holding mechanism; chelipeds equal, robust, relatively large; P 2 ���P 4 long, flattened; P 5 conspicuously reduced. Etymology. From Serrablo, the mediaeval name of the area (Pyrenees, Huesca) and the ending pluma, which refers to the main character of the family. Remarks. The new genus differs from all others currently included in the Retroplumidae (see De Grave et al. 2009: 41) in having a wide, broadly arched anterior margin, a conspicuously reduced front and an anterior dorsal ridge that intersects the anterior margin at the position of long, fairly projecting lateral spines. Serrablopluma diminuta n. sp. (Figs. 1���2) Diagnosis. As for genus. Etymology. From the Latin diminutus, in allusion to the rather reduced size. Material examined. MGSB 75287, holotype; MGSB 75289, MGSB 75290 a, b, MGSB 78334 a, b, and MGSB 78335 a, b, c, paratypes; MAB k. 3279���3281, MAB k. 3293, MAB k. 3295, paratypes, all from Fanlillo, municipality of Yebra de Basa, Huesca, and of late Eocene (Priabonian) age. In the holotype, the maximum carapace width and length (in millimetres) are 12 and 9, respectively. Description. Carapace small (maximum carapace width 12 mm); subtrapezoidal in outline; wider than long, widest anteriorly at level of lateral spines; dorsal surface flat in both directions. Anterior margin sinuous, broadly arched, with projecting lateral spines. Front conspicuously reduced, narrow, directed forwards; orbits wide, with sub-orbital spine. Lateral margins straight, inclined, converging posteriorly. Posterior margin convex, wide, only slightly shorter than orbitofrontal margin. Dorsal surface with 3 ridges; anteriormost intersecting anterior margins laterally; median ridge defined by epibranchial swellings, interrupted by gastric grooves; posterior ridge straight, continuous, interrupted only by small indentations of subtle branchiocardiac grooves. Dorsal surface smooth except for horizontal ridges, shallow grooves. Mesogastric region defined by 2 faint swellings, bounded by weak posterior grooves. Cardiac region large, gently swollen, sub-rhomboidal in shape. Intestinal region flat. Thoracic sternum much broader than long, sternites with subtle ridges; sternites 1,2 fused, small, subtriangular; sternites 3, 4 subtrapezoidal; sternite 4 with pronounced lateral extensions; small, weak indentation between sternites 3, 4; sternites 5���7 subrectangular, with subtle inclined ridges; sternite 8 conspicuously reduced, oblique; vulvae large, subcircular, situated below extremity of suture 5 / 6. Male abdomen subtriangular, with segments 3���5 fused, all segments with pronounced horizontal ridge; female abdomen much broader, all segments separated, with marked ridges. Abdominal holding mechanism with press-button on sternite 5, and lateral extensions of abdominal segment 6. P 1 subequal, robust, relatively large, strong, inner portion of dactyli with numerous denticles. P 2 ���P 4 long, flattened. P 5 conspicuously reduced. Remarks. Serrablopluma diminuta n. gen., n. sp. shows the plesiomorphic characters of Retroplumidae (de Saint Laurent 1989: 111���112), namely a sinuous anterior margin and a narrow front; a set of dorsal transverse ridges; a thoracic sternum that is much broader than long; subtrapezoidal sternites 3, 4, with pronounced lateral extensions in sternite 4 behind a distinct notch in sternite 3; distinctly wide, sub-rectangular sternites 5���7; a conspicuously reduced, oblique sternite 8; distinct sexual dimorphism for abdomen; P 2 ���P 4 long, flattened; P 5 conspicuously reduced, sub-dorsal. The thoracic sternum is typical of Retroplumidae (see Guinot & Quenette 2005: fig. 29 A). Genera that resemble Serrablopluma n. gen. are Loerentheya (see Glaessner 1969: fig. 338, 5) and Loerenthopluma, both of which have a sub-trapezoidal carapace, with the maximum width anteriorly and a wide anterior margin. Serrablopluma n. gen., however, shows distinct characters such as the anterior carapace ridge that intersects the anterior margin, a markedly long lateral spine and lateral margins that are uniformly straight. The extinct genera Retropluma and Retrocypoda differ (see Beschin et al. 1996: figs 4, 5) in having a subrectangular carapace outline, a much narrower anterior margin, lateral margins broadly arched, not diverging posteriorly and an anterior dorsal carapace ridge without lateral spines. The carapace outline is sub-trapezoidal in Serrablopluma n. gen., the anterior margin conspicuously wide, clearly broader than the posterior margin;moreover, the anterior margins terminate in a long lateral spine intersecting the first anterior dorsal ridge, while lateral margins are straight and continuous and converge posteriorly. Species of Costacopluma and Archaeopus, which were included in the Retroplumidae by De Grave et al. (2009: 41), exhibit much more inflated carapaces, with markedly convex dorsal surfaces. The dorsal surface in Archaeopus has in addition swollen regions (Rathbun 1908: pl. 47, fig. 5), rather than the thin ridges that define Serrablopluma n. gen., Published as part of Artal, Pedro, Van Bakel, Barry W. M., Fraaije, Ren�� H. B. & Jagt, John W. M., 2013, New retroplumid crabs (Crustacea, Brachyura, Retroplumidae Gill, 1894) from the Eocene of Huesca (Arag��n, Spain), pp. 343-352 in Zootaxa 3652 (3) on pages 344-348, DOI: 10.11646/zootaxa.3652.3.3, http://zenodo.org/record/221749

One of the most important parameters in characterization of integrated optical devices is precise determination of the effective cut-off wavelength of the fundamental and first-order modes, since this sets the exact region of single-mode operation. This paper describes an experimental set-up for determination of cut-off wavelengths of integrated optical waveguides, using the technique of spectral light transmission. Measurement results obtained with Ti:LiNbO3 channel waveguides are presented for straight waveguides, bent waveguides and polarizers.

We study the conditional preparation of single photons based on parametric downconversion, where the detection of one photon from a given pair heralds the existence of a single photon in the conjugate mode. We derive conditions on the modal characteristics of the photon pairs, which ensure that the conditionally prepared single photons are quantum-mechanically pure. We propose specific experimental techniques that yield photon pairs ideally suited for single-photon conditional preparation., Comment: 14 pages, 6 figures

One of the most important parameters in the characterization of integrated optical waveguides is the precise determination of the effective cut-off wavelength of the fundamental and the first order mode, since it sets the exact region of single-mode operation. This paper describes an experimental set-up for the measurement of the cut-off wavelengths of integrated optical waveguides, using the technique of spectral light transmission. Measurement results obtained with Ti:LiNbO3 channel waveguides are presented. The effect of different geometrical parameters and fabrication conditions on the cut-off wavelengths of the channel waveguides for both TE and TM mode excitation will be discussed.