摘要
Here we revise a fossil cobitid species ■Cobitis longipectoralis Zhou, 1992, based mainly on a well-preserved specimen collected recently from the taxon’s type locality of the late early Miocene of Shanwang, Shandong Province, East China. The new specimen, along with those collected by Zhou, enables us to provide an emended diagnosis and more detailed description of the species by focusing on the characters such as the structures of the suborbital spine and the presence and shape of the lamina circularis at the base of the second pectoral fin ray in adult males, the presence of a frontoparietal fontanelle, and a quad- rate-metapterygoid fenestra, etc. The long pectoral fin, initially considered by Zhou as the most important character of the spe- cies, however, turns out to be not diagnostic for the species. ■Cobitis longipectoralis Zhou, 1992 is not only the most informative and best-preserved early cobitid fossil known thus far but also the only and earliest cobitid fossil from East Asia.
Here we revise a fossil cobitid species ■Cobitis longipectoralis Zhou, 1992, based mainly on a well-preserved specimen collected recently from the taxon’s type locality of the late early Miocene of Shanwang, Shandong Province, East China. The new specimen, along with those collected by Zhou, enables us to provide an emended diagnosis and more detailed description of the species by focusing on the characters such as the structures of the suborbital spine and the presence and shape of the lamina circularis at the base of the second pectoral fin ray in adult males, the presence of a frontoparietal fontanelle, and a quad- rate-metapterygoid fenestra, etc. The long pectoral fin, initially considered by Zhou as the most important character of the spe- cies, however, turns out to be not diagnostic for the species. ■Cobitis longipectoralis Zhou, 1992 is not only the most informative and best-preserved early cobitid fossil known thus far but also the only and earliest cobitid fossil from East Asia.
基金
supported by National Natural Science Foundation of China (Grant Nos. 40432003 and 40662001)
State Key Laboratory of Palaeobiology and Stratigraphy (Grant No. 063106)
Cypriniformes Tree of Life under the U.S. National Science Foundation to R. Mayden (Grant No. EF0431326)
