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标题：Osteohistology of hyperodapedontine rhynchosaurs from the Upper Triassic of Southern Brazil
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作者：FÁBIO HIRATSUKA VEIGA ; MARINA BENTO SOARES ; JULIANA MANSO SAYÃO 等
期刊名称：Acta Palaeontologica Polonica
印刷版ISSN：0567-7920
电子版ISSN：1732-2421
出版年度：2015
卷号：60
期号：4
页码：829-836
DOI：10.4202/app.00074.2014
语种：English
出版社：Institute of Paleobiology PAS
摘要：The first osteohistological study focused exclusively on rhynchosaurs (non-archosauriform archosauromorphs), based on the hyperodapedontines Teyumbaita sulcognathus and Hyperodapedon sp., from the Upper Triassic of Southern Brazil, indicates a relatively rapid growth rate in early ontogeny shown by the fibrolamellar complex, with a change to slow intermittent growth during late ontogeny represented by parallel-fibred bone with several growth marks. Contrary to previous studies, which described a typical non-archosaur reptilian bone tissue pattern for rhynchosaurs, with growth marks extending across the entire cortex, we demonstrate that, in both studied taxa, the initial growth rate was faster in comparison to the later. This suggests that the ability of rapid growth at high rates was already present in basal non-archosauriform archosauromorphs.
关键词：Diapsida;Archosauromorpha;Rhynchosauria;Hyperodapedontinae;bone histology;growth pattern;Triassic;Brazil