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Chengyuchelyidae (disused)
Taxonomy
Chengyuchelyidae was named by Yeh (1990).
It was assigned to Cryptodira by Yeh (1990); to Cryptodira by Brinkman et al. (2008); and to Testudinata by Anquetin (2012).
It was assigned to Cryptodira by Yeh (1990); to Cryptodira by Brinkman et al. (2008); and to Testudinata by Anquetin (2012).
Synonymy list
Year | Name and author |
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1990 | Chengyuchelyidae Yeh |
2008 | Chengyuchelyidae Brinkman et al. p. 35 |
2012 | Chengyuchelyidae Anquetin p. 34 fig. 10 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Fm. †Chengyuchelyidae Yeh 1990
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Diagnosis
Reference | Diagnosis | |
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H. -K. Yeh 1990 | [Paracyrptodires are moderate to large in size and found predominantly in the Middle Jurassic. The carapace is oval and lacks conspicuous surface ornamentation. Eight neurals are present, the majority of which are hexagonal with shortened anterior lateral margins. Breadth of vertebral scales is normal or transversely expanded. Xinjiangchelys from the upper Middle Jurassic of the Xinjiang Autonomous Region displays only a single large posteriorly expanded suprapygal plate that differs from Chengyuchelys in which the suprapygal is either absent or inconspicuously preserved. Anterior and posterior margins of the plastron are both shorter than the carapace with the posterior margin slightly crescentic but not deeply embayed anteriorly. A mesoplastron is situated either within the abdominal scale or between the pectoral and abdominal scales, and joined at the midline of the plastron. Chengyuchelys possesses a broad bony bridge with at least three inframarginal scales at each margin. The center of the anal scale penetrates the hypoplastron anteriorly. These latter two characters are not observed in Xinjiangchelys, but axillary and inguinal buttresses in addition to a portion of its axial skeleton are preserved in this genus. The two buttresses are extended anteriorly and posteriorly, but unlike the common testudinian condition are not dorsally extended. The angle of the scapular body to the anterior coracoid process exceeds 90°. The lateral process of the pubis is robust, while the pubic symphysis is large and projects strong to the anterior. The ilium is primarily extended posteriorly and does not hang perpendicularly, a condition which resembles several baenids. Humerus and femur are robust, flattened dorsoventral and maintain uncurved shafts.] |
Measurements
No measurements are available
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Source: c = class, subp = subphylum, uc = unranked clade | |||||
References: Carroll 1988, Hendy et al. 2009 |
Collections
No collection or age range data are available