A chroniosuchid from the Triassic of Kyrgyzstan and analysis of chroniosuchian relationships

A chroniosuchid from the Triassic of Kyrgyzstan and analysis of chroniosuchian relationships
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吉尔吉斯斯坦三叠纪的计时鳄及计时鳄关系分析

DOI:
10.1111/j.1096-3642.2009.00613.x
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发表时间:
2010
影响因子:
2.8
通讯作者:
Buchwitz
Buchwitz
中科院分区:
生物学2区
文献类型:
--
作者:
Schoch;Buchwitz

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A nearly complete skull and associated osteoderms from the Middle/Upper Triassic Madygen Formation of Kyrgyzstan are referred to a new chroniosuchid genus and species. The new taxon is characterized by a parabolic skull outline, pustular ornamentation, tabular-squamosal contact, marked postparietal embayments, and the lack of an antorbital fontanelle. The palate is only preserved in part, showing broad palatines and ectopterygoids. Presence of a preorbital fenestra and characteristic osteoderm morphology are synapomorphies shared with all other chroniosuchids. According to the phylogenetic analysis performed, the new chroniosuchid nests withChroniosaurus, with which it shares the wide, transversely extended osteoderms and pustular ornamentation. The chroniosuchians are robustly supported as a natural group, but their position within the reptiliomorph (stem-amniote) clade is not adequately understood. Whereas the parasphenoid is similar to that of anthracosaurs, most other characters support a higher nesting of chroniosuchians within the stem-amniotes.
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