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Kenichthys
''Kenichthys'' is a genus of sarcopterygian fish from the Devonian period, and a member of the clade tetrapodomorpha. The only known species of the genus is ''Kenichthys campbelli'' (named for the Australian palaeontologist K.S.W. Campbell), the first remains of which were found in China in 1993.〔Chang, M. and Zhu, M. (1993) A new Middle Devonian osteolepidid from Qujing, Yunnan. ''Mem. Assoc. Australas. Palaeontol.'' 15 183-198〕 The genus is important to the study of the evolution of tetrapods due to the unique nature of its nostrils, which provide vital evidence regarding the evolutionary transition of fish-like nostrils to the vertebrate choanae.〔Zhu, M. and Ahlberg, P. (2004) The origin of the internal nostril of tetrapods. ''Nature'' 432 94-97 〕
==Description==
''Kenichthys'' was a small tetrapodomorph, with a skull about 2 cm long.〔 While only areas of the front of the body are known, it seems likely that ''Kenichthys'' would have been similar in general body form other basal sarcopterygians, with two dorsal fins, paired pectoral and pelvic fins and an anal fin.
An important way in which ''Kenichthys'' differed from other tetropodomorphs however is in the positioning of its posterior nostril. Whilst in other tetropodomorphs this nostril is positioned in the roof of the mouth (the palate), in Kenichthys it is found at the jaw margin, between the premaxilla and maxilla.〔
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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