准噶尔盆地克拉美丽地区的鸟脚类

ON A SMALL ORNITHOPOD(GONGBUSAURUS WUCAIWANENSIS SP.NOV.)FROM KELAMAILI,JUNGGAR BASIN,XINJIANG,CHINA

本文记述了一个小型鸟脚类——五彩湾工部龙(新种)Gongbusaurus wucaiwanensis sp.nov.,讨论了它们的分类位置和产出地层时代。

A small ornithopodian dinosaur(Gongbusaurus wucaiwangensis sp.nov.)is described in this paper.This is the first report and description of small ornithopod from the Jurassic of Junggar Basin.The materials were collected from Wucaiwan(the field number 83007)which is situated at the southwestern side of the Kelamaili mountian in Junggar Basin.This site was excavated by the field team of IVPP in Summer of 1983. Desrciption Order Ornithischia Seeley,1888 Suborder Ornithopoda Marsh,1871 Family Hypsilophodontidae Dollo,1882 Genus Gongbusaurus Dong Chow et Chang,1983 Diagnosis A small primitive ornithopod,with premaxillary teeth,the teeth point, unsymmetrical with no wear faces on the crown.The crown of the cheek teeth symmetrical,lack- ing wear face.The crown has enamel in both inside and outside.The cheek teeth are similar to that of fabrosaurid. Species Gongbusaurus wucaiwanensis sp.nov. Materials Type A fragmentary left mandable,three caudal vertebrae and an in- complete forelimb.IVPP cat.8302. Paratype Two sacral vertebrae,eight caudal vertebrae and a pair of complete hindlimbs. IVPP cat.8303. Horizon and Locality Wucaiwan,Kelanaili region,Junggar Basin.Xinjianp,China; Shishugou Formation,Early Late Jurassic. Diagnosis A small ornithopod,the whole length is 1.3—1.5 meters.There are 12 alveolus preserved in the fragmentary dentary,with two replacing teeth in the forth and twelveth alveolus in site separatly.But the teeth numbers estimatively should be 12—14 in the lower jaw,so pro- bably there are two teeth were lost from this specimen.The feature of the cheek teeth is similar to that of Gongbusaurus shiyi from Sichuan Basin.But the tooth of the new species is larger and thicker than the form of Sichuan.The blade-like prepubis has an anterior tip process, There are 4 distal tarsal in the tarsal region of hindlimb.The metatarsal III is the longest and stoutest with about two times of the length of metatarsal I.The metatarsal I is shorter and slender.The metatarsal Y is reduced to a rod-like little bone which is lay under metetarsal IV and is fused together with the latter.The digital numbers;2.3.4.5.0. The natures of the hind limb and foot of Gongbusaurus wucaiwanensis indicated that it could be a cursorial form,but not an arboreal one.