Challenging cosmopolitanism in the deep sea: The case of “ Cythere acanthoderma Brady, 1880” (Crustacea, Ostracoda)

摘要: Abstract Cythere acanthoderma Brady was described from Recent sediments collected all world's oceans during the HMS Challenger expedition in 1870s. Subsequently, this species has been recorded at least 27 publications, extending its stratigraphical range back into Upper Eocene, zoogeographical Atlantic, Indian, Pacific, Arctic and Southern oceans, bathymetric continental shelf (> 400 m) to deeper regions of abyss (> 5000 m). Importantly, C. acanthoderma erected type widespread abundant, deep-sea genus Legitimocythere Coles Whatley, 1989 . For present publication, specimens housed Natural History Museum London were re-studied. Based on material previous L. acanthoderma is revised, re-diagnosed re-illustrated with scanning electron microscopy. Twenty-two are, herein, as Henryhowella, Trachyleberididae gen. nov. cf. Legitimocythere. Finally, comparisons based illustrations earlier publications show that only a few over 70 records (i.e., fossil samples) could be confirmed; remaining either involved distinct or genera are dubious. As consequence, revised distribution includes bathyal depths Subantarctic region Ocean, so it can no longer considered cosmopolitan, eurybathic have existed for 30 million years.