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Dinichthys
''Dinichthys herzeri'' is an extinct, giant, marine arthrodire placoderm from the Late Devonian (Famennian stage) of Ohio and Tennessee. It was comparable in size, shape, and ecological role to the better-known ''Dunkleosteus''. Originally described in 1868 by John Newberry on the basis of an incomplete skull roof and mandibles (AMNH 81), this species remains imperfectly known to this day.
For much of the 20th century, many unrelated large arthrodires were classified together within this genus, including species now assigned to ''Dunkleosteus'', ''Eastmanosteus'', and ''Titanichthys''. Today, ''Dinichthys'' is considered a monotypic genus, containing only the type species, ''D. herzeri''. Similarly, in a 2010 analysis, the family Dinichthyidae that once held a wide range of arthrodire genera was redefined as comprising only ''Dinichthys''.
The type species of ''Dunkleosteus'' was originally described as ''Dinichthys terrelli'' by Newberry in 1873. After complete exoskeletons of this species were discovered in the early 20th century, ''Din. terrelli'' served as the basis for life reconstructions of the genus as opposed to the fragmentary ''Din. herzeri'', even long after ''terrelli'' was separated into ''Dunkleosteus'' by Jean Pierre Lehman in 1956. As a result, most illustrations captioned as ''Dinichthys'' are actually pictures of ''Dunkleosteus''.〔http://kids.britannica.com/comptons/art-107865/A-reconstructed-head-of-Dinichthys-terrelli-a-species-of-jawed〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Dinichthys」の詳細全文を読む
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