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Steindachneridion
''Steindachneridion'' is a genus of South American pimelodid catfish (order Siluriformes).
==Taxonomy==
The first species of the genus, ''S. parahybae'', was described in 1877 by Franz Steindachner under the name ''Platystoma parahybae''. Later, Carl H. Eigenmann and Rosa Smith Eigenmann described ''Steindachneridia'', named for Steindachner, for this species and for ''S. amblyurum'' (designated as the type species) in 1888. The next year, Eigenmann and Eigenmann described ''S. doceanum''. In 1918, Miranda Ribeiro described ''S. scriptum'' and ''S. scriptum punctatum''; later, ''S. punctatum'' was studied and considered to be a species of its own. However, because ''Steindachneria'' was already being used, these fish were transferred to ''Steindachneridion'' in 1919.〔 The most recent species, ''S. melanodermatum'', was described by Garavello in 2005.〔 This genus currently includes six extant species.〔
Two fossil species of ''Steindachneridion'' have been found. The first to be described, ''S. iherengi'' (Woodward, 1898) was first described to ''Arius'', but subsequently moved to ''Steindachneridion''; though originally considered to be of Pleistocene age, it was later found to be actually of Oligocene age.〔 The second fossil species to be described was ''S. silvasantosi'' Figueiredo & Costa-Carvalho, 1999.〔
The phylogenetic placement of ''Steindachneridion'' and its relationship to other pimelodid genera is unresolved.〔 These fish have been classified with ''Sorubim''-like fish such as ''Brachyplatystoma'' and ''Pseudoplatystoma''.〔〔 They have also been classified as being more closely related to ''Phractocephalus'' and ''Leiarius''.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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