《Table 3 Measurements of astragali of Teleolophus medius》
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《内蒙古二连盆地沙拉木伦地区中始新世全脊貘(Teleolophus)(奇蹄目:貘超科)头后骨骼研究(英文)》
a) Approximate measurements.
Astragalus Three right astragali are preserved.One left astragalus is articulated with the tibia in position(IVPP V 23887)(Fig.3) ,and two isolated left astragali are also preserved(IVPP V 23890.4–5)(Fig.5A–E;Table 3) .The height of the trochlea is about equal to its width(Fig.5A).The median groove is relatively wide and moderately deep.The trochlea is asymmetrical with a lateral part wider and more gradual than a medial one.The ridges of the trochlea are blunt,and the medial ridge is separated from the navicular facet by a short distance as in Heptodon and Helaletes.However,the medial ridge of the trochlea either contacts the navicular facet or is separated from the latter by a short distance in Deperetella(AMNH FM81817).The ridges of trochlea are sharper with the medial ridge contacting the navicular facet in Lophialetes.The astragalus of Helaletes is high and narrow,having relatively sharper ridges of the trochlea and a longer neck than that of the Teleolophus(Peterson,1919:pl.42,fi g.8).The astragalus of Colodon has a relatively lower and wider trochlea than that of Teleolophus with a medial ridge joining the navicular facet(Scott,1941).The lateral surface of the trochlea for the fi bula is slightly concave and lacks a laterally projected process on the distal end as in Deperetella(Fig.5A,D),whereas the laterally projected process is present in other compared taxa.The medial surface of the trochlea for the medial malleolus is slightly convex without a proximal,medially projected process as that of Deperetella(Fig.5A,C),whereas the proximal process is present in Lophialetes.Distomedial to the medial ridge of the trochlea there is a moderately deep fossa.The neck is relatively short.
图表编号 | XD0020742100 严禁用于非法目的 |
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绘制时间 | 2018.07.01 |
作者 | 白滨、王元青、孟津 |
绘制单位 | 中国科学院古脊椎动物与古人类研究所中国科学院脊椎动物演化与人类起源重点实验室、中国科学院生物演化与环境卓越创新中心、中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室、中国科学院古脊椎动物与古人类研究所中国科学院脊椎动物演化与人类起源重点实验室、中国科学院生物演化与环境卓越创新中心、中国科学院大学地球科学学院、中国科学院古脊椎动物与古人类研究所中国科学院脊椎动物演化与人类起源重点实验室、美国自然历史博物馆古生物学部 |
更多格式 | 高清、无水印(增值服务) |
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