Morphology and systematics of the Pennsylvanian amphibian Platyrhinops lyelli (Amphibia: Temnospondyli)
Morphology and systematics of the Pennsylvanian amphibian Platyrhinops lyelli (Amphibia: Temnospondyli)
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宾夕法尼亚两栖动物 Platyrhinops lyelli（两栖类：Temnospondyli）的形态学和系统学
DOI：
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发表时间：
2009
影响因子：
1.2
通讯作者：
A. Milner
中科院分区：
文献类型：
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作者：
J. Clack;A. Milner
摘要对产于俄亥俄州林顿中宾夕法尼亚阶的两栖类扁头龙属的形态进行了重新评价。新报道或新的重要特征包括双尖牙边缘齿、前部增宽的额部、细长的软骨、宽的菱形蝶筛骨和一对扁平的刀片状角舌。其中一个标本显示，沿着前颌骨的牙齿大小分布不寻常。没有发现任何衍生的特征来证明把lyelli种归为以其模式种A为代表的Amphibamus属。但扁头龙属属于两栖纲的“两栖分支”。
ABSTRACT The morphology of the amphibamid temnospondyl amphibian Platyrhinops lyelli from the Middle Pennsylvanian of Linton, Ohio is reassessed from previously described and undescribed specimens. Newly reported or newly significant features include the presence of bicuspid marginal teeth, anteriorly widened frontals, elongate choanae, a broad rhomboidal sphenethmoid and a pair of flattened blade-like ceratohyals. One specimen shows an unusual distribution of tooth sizes along the premaxillaries. No derived characters can be found to justify reference of the species lyelli to the genus Amphibamus as represented by its type species A. grandiceps, but Platyrhinops does belong to the ‘Amphibamus branch’ of the Amphibamidae.