Reisz Robert R, Liu Jun, Li Jin-Ling, Müller Johannes
Department of Biology, University of Toronto Mississauga, 3359 Mississauga Rd. N., Mississauga, Ontario, Canada.
Naturwissenschaften. 2011 May;98(5):435-41. doi: 10.1007/s00114-011-0793-0. Epub 2011 Apr 12.
Captorhinids, a clade of Paleozoic reptiles, are represented by a rich fossil record that extends from the Late Carboniferous into the Late Permian. Representatives of this clade dispersed from the equatorial regions of Laurasia into the temperate regions of Pangea during the Middle and Late Permian. This rich fossil record shows that there was an evolutionary trend from faunivorous to omnivorous and herbivorous feeding habits within this clade. The discovery of well-preserved captorhinid materials in the Middle Permian of China allows us to determine that the new taxon, Gansurhinus qingtoushanensis, gen. et sp. nov, is a member of Moradisaurinae, a clade of captorhinids with multiple tooth rows arranged in parallel. The presence of this moradisaurine in the Middle Permian of south central Asia leads us to suggest that paleogeographic changes during the Permian, with part of what is today China becoming a large peninsula of Pangea, allowed these early reptiles as well as other terrestrial vertebrates to extend their geographic ranges to this region of the Late Paleozoic supercontinent.
杯鼻龙类是一类古生代爬行动物，其丰富的化石记录可追溯到晚石炭世到晚二叠世。在二叠纪中期和晚期，该类群的代表从劳亚大陆的赤道地区扩散到泛大陆的温带地区。这一丰富的化石记录表明，该类群存在从食虫性到杂食性和草食性饮食习惯的进化趋势。在中国中二叠世发现保存完好的杯鼻龙类材料，使我们能够确定新分类单元——青头山甘肃鼻龙（Gansurhinus qingtoushanensis），属及种为新属新种，是多排齿平行排列的杯鼻龙类分支——莫拉恐龙亚科的成员。这种莫拉恐龙亚科动物出现在中亚中二叠世，这使我们推测，二叠纪期间的古地理变化，即如今中国的部分地区成为泛大陆的一个大半岛，使得这些早期爬行动物以及其他陆地脊椎动物能够将其地理范围扩展到晚古生代超级大陆的这一区域。
