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Ontogeny of an anchialine ostracod from Western Australia and comments on the origin and distribution of Halocyprididae

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Juvenile instars II, IV, and V of the anchialine halocyprid ostracod Danielopolina kornickeri Danielopol, Baltanas & Humphreys, 2000 (Thaumatocyprididae) are described and illustrated. In addition, a supplementary description of the adult male is presented. Specimens had been collected in Bundera Sinkhole, the type locality of the species in Western Australia. Also, juvenile instars I and II of the deep-sea species Thaumatoconcha radiata Kornicker & Sohn, 1976, which is in the same family as members of the genus Danielopolina, are described and illustrated. It is tentatively concluded that during its ontogeny, D. kornickeri has 6 growth stages; morphological characters useful in identifying the stage and sex of juveniles of D. kornickeri are presented. Finally, the hypothesis is proposed for an anchialine cave ancestor to the present-day planktonic Halocyprididae, now widely spread in the oceans. Les stades juvéniles II, IV et V de l'ostracode anchihalin de la famille des Halocyprididae, Danielopolina kornickeri Danielopol, Baltanas & Humphreys, 2000 sont décrits et illustrés. Une description complémentaire du mâle adulte est également présentée. Les spécimens ont été collectés à Bundera Sinkhole, la localité-type de l'espèce en Australie occidentale. De même, les stades juvéniles I et II de l'espèce d'eaux profondes Thaumatoconcha radiata Kornicker & Sohn, 1976, taxon attribué à la même famille comme membres du genre Danielopolina sont décrits et illustrés. La conclusion provisoire est que, au cours de son ontogénie, D. kornickeri montre 6 stades de croissance; les caractères morphologiques utiles pour l'identification du stade et du sexe des stades juvéniles de D. kornickeri sont présentés. Enfin, l'hypothèse d'un ancêtre vivant dans des grottes anchihalines est proposée pour les Halocyprididae, aujourd'hui planctoniques et largement répandus dans les océans.

Affiliations: 1: Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20013-7012, U.S.A.; 2: Collections and Research Centre, Western Australian Museum, Locked Bag 49, Welshpool D.C., WA 6986, Australia; School of Animal Biology, University of Western Australia, Nedlands, WA 6009, Australia; School of Earth and Environmental Sciences, The University of Adelaide, SA 5005, Australia; 3: Commission for the Stratigraphical & Palaeontological Research of Austria, Austrian Academy of Sciences, c/o Institute of Earth Sciences, University of Graz, Heinrichstrasse 26, A-8010 Graz, Austria

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