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首页> 外文期刊>Journal of Paleontology >A juvenile Koskinonodon perfectus (Temnospondyli, Metoposauridae) from the Upper Triassic of Arizona and its implications for the taxonomy of North American metoposaurids
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A juvenile Koskinonodon perfectus (Temnospondyli, Metoposauridae) from the Upper Triassic of Arizona and its implications for the taxonomy of North American metoposaurids

机译：来自亚利桑那州上三叠系的少年Koskinonodon Perfect（Temnospontyli，Metoposauridae）及其对北美摩托车龙龙的分类的影响

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Metoposaurids are temnospondyl amphibians that are well known from Upper Triassic deposits in North America, Europe, India, and Africa. Two species of metoposaurids, Koskinonodon perfectus and Apachesaurus gregorii, are among the most common fossils found in the Petrified Forest National Park (PEFO) of the southwestern United States. The two are distinguished on the basis of several cranial traits and the morphology of their intercentra, and are more informally distinguished by their overall size and biostratigraphic range. While material of adult metoposaurids is extremely common in Upper Triassic deposits, described material of juveniles is very rare, which limits the study of ontogenetic trajectories that would assist in assessing whether diagnostic traits of the smaller A. gregorii are also ontogenetically influenced traits in juveniles of K. perfectus. Here we report on material from a juvenile specimen of K. perfectus from the Petrified Forest Member (Norian) of the Chinle Formation in the PEFO. This specimen is significant because it represents the highest known occurrence of the species within the PEFO, documents a rare occurrence of a juvenile specimen of a North American metoposaurid, and records a rare North American metoposaurid specimen that includes associated cranial and postcranial material. Additionally, the combination of cranial features diagnostic of K. perfectus and intercentra of proportions intermediate between K. perfectus and A. gregorii in this specimen raises questions about the utility of several characters for species discrimination in North American metoposaurids.
机译：Metoposaurids是北美，欧洲，印度和非洲的上三叠系沉积物中众所周知的温度龙骨两栖动物。两种媒体龙骨，KoskinOnodon Presentus和Apachesaurus Gregorii，是美国西南部石化森林国家公园（PEFO）的最常见的化石之一。这两者在几个颅骨特征的基础上区分和它们的晶片的形态，并且更加非正式地区分了它们的整体大小和生物数据库范围。虽然成人饲料的材料在上三叠纪沉积物中非常常见，但是描述的少年材料是非常罕见的，这限制了对细胞发生轨迹的研究，这些轨迹可以有助于评估较小A. Gregorii的诊断特性是否也是在幼年的植物中的植物影响K. Perfectus。在这里，我们从PEFO中石油林成员（诺里安）的少年标本从K. Perfectus的少年标本报告。该样本是显着的，因为它代表了PEFO内的物种的最高出现，文件是北美摩托车的少年标本的罕见发生，并记录了包括相关的颅骨和颅期材料的罕见北美梅普龙标本。此外，颅骨特征诊断的组合诊断为K. Perfectus和A. Gregorii的比例中间的比例在本标本中的初始化提出了关于北美摩托车龙属于物种歧视的若干人物的效用的问题。

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