期刊
JOURNAL OF VERTEBRATE PALEONTOLOGY
卷 23, 期 4, 页码 869-876出版社
SOC VERTEBRATE PALEONTOLOGY
DOI: 10.1671/2383-11
关键词
-
类别
A reanalysis of the upper and lower molar morphology of the early Paleocene marsupial Roberthoff-stetteria nationalgeographica led to an interpretation of the molar homologies of the Polydolopinae (Polydolopimorphia). Several derived features support the attribution of Roberthoffstetteria to the Polydolopimorphia: thick dentary, molars with thick enamel, upper molars with reduced preparacrista that points to stylar cusp A, open centrocrista (that is, postparacrista not connected to the premetacrista), and metaconule large to very large, forming a hypocone. Other derived features support the monophyly of Roberthoffstetteria + polydolopines: alignment of paraconule, protocone, and metaconule in a lingual row; well-expanded anterior and posterior cingula, which are level with the trigon basin; variable occurrence of accessory cuspules at the labial face of the upper molars; and the labially placed paraconid with respect to the metaconid in the lower molars. Both Roberthoffstetteria and the polydolopines are plesiomorphic in having stylar cusp E, which is absent in most other South American marsupials. Several character complexes may be involved in the evolution of the polydolopine molar pattern.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据