A New Material of Thalattosauria (Reptilia: Diapsida) from the Middle Triassic of Luoping, Yunnan Province
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摘要: 海龙类前肢化石标本(YIGM SPC V 0832-2)采自于云南省罗平县新寨一带中三叠统安尼阶(Pelsonian亚阶)关岭组二段顶部.其不仅为海龙类在罗平生物群中的首次发现, 而且为长颈型海龙的最早记录.该海龙类新材料虽然保存不全, 但是仍具有一些独特的特征: 桡骨远端两侧边缘平行; 尺骨远端扩展; 11个硬骨化腕骨; 第三掌骨近端内侧缘发育横突; 指式为2-3-4-4-4(?).虽然上述特征尚不足以建立一海龙类新属种, 但是仍然反映了部分海龙类单元在向海洋适应辐射的过程保留有原始爬行类的特征.这些原始特征暗示着部分海龙类可能以营陆生生活为主.Abstract: A thalattosaur forelimb specimen described here, was collected from the second member of Guanling Formation (the Middle Triassic Anisian Pelsonian) of Xinzai village, Luoping County, Yunnan Province. It is not only the first appearance of Thalattosauria from Luoping Biota, but also the oldest record of long-necked taxon (Askeptosauridea). The incomplete skeleton of zeugopodium and autopodium is featured with the following special characters such as paralleled distolateral margins, expanded distal end of ulna, 11 ossified carpal elements, a transverse process in the proximal end of the third metacarpal and the phalangeal formula 2-3-4-4-4 (?). These characters are not enough to define a new taxon in Thalattosauria, but they show that some thalattosaur taxa preserved some primitive characters when they were divergent to water. Furthermore, these primitive characters indicate that some thalattosaur taxa could have lived on seashore.
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Key words:
- Thalattosauria /
- Triassic /
- stratigraphy /
- Yunnan Province
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图 1 安顺龙(相似属)部分前肢(YIGM SPC V 0832-2)
a.照片；b.素描图；简写说明：c2-c3.中央骨；dc1-dc5.第一至第五远端腕骨；in.间中骨；p.豌豆骨；ra.桡骨；rad.桡侧腕骨；ul.尺侧；uln.尺侧腕骨；Ⅰ-Ⅴ.第一至第五掌骨
Fig. 1. Partial forelimb of cf. Anshunsaurus (YIGM SPC V 0832-2)
图 2 腕部发育对比
a.原始的两栖类腕部；b.原始的爬行类腕部；c.安顺龙(相似属)；a和b据Romer(1956)修改，简写说明见图 1
Fig. 2. Comparison of carpals of primitive amphibian condition (a), primitive reptilian condition (b) and cf. Anshunsaurus condition (c)
表 1 安顺龙(相似属)的测量结果(mm)
Table 1. Measurements of cf. Anshunsaurus
mc1 mc2 mc3 mc4 mc5 1st prm 2nd prm 3rd prm 4th prm 5th prm 长度 16.8 28.0 31.3 32.1 26.2 7.5 13.5 17.0 22.4 22.0 近端宽度 18.4 17.3 13.0 13.8 15.2 12.0 15.0 14.0 13.0 12.5 最小宽度 10.6 7.6 6.1 6.7 7.6 8.5 9.5 9.5 6.8 6.0 远端宽度 13.8 13.1 12.5 14.1 13.6 10.0 13.0 12.5 12.5 10.5 rad in uln p c2 c3 1st dc 2nd dc 3rd dc 4th dc 5th dc 最大直径 16.9 26.8 24.1 16.6 21.3 18.9 14.5 13.4 11.1 8.4 14.5 注：mc.掌骨；prm.近端手骨，其余见图 1. 
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