Osteohistology of hyperodapedontine rhynchosaurs from the Upper Triassic of Southern Brazil

• Autorzy: Veiga F.H. , Soares M.B. , Sayao J.M.
• Języki publikacji: EN

Abstrakty

EN

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-ar-chosauriform archosauromorphs.

Słowa kluczowe

EN

hyperodapedontine rhynchosaur; rhynchosaur; Diapsida; Archosauromorpha; Rhynchosauria; Hyperodapedontinae; bone histology; growth pattern; Triassic; Brazil

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2015
• Tom: 60
• Numer: 4
• Opis fizyczny: p.829-836,fig.,ref.

Twórcy

autor

Veiga F.H.

• Departamento de Paleontologia e Estratigrafia, Universidade Federal do Rio Grande do Sul, Av.Bento Goncalves 9500, 91540-000, Porto Alegre RS, Brazil

autor

Soares M.B.

• Departamento de Paleontologia e Estratigrafia, Universidade Federal do Rio Grande do Sul, Av.Bento Goncalves 9500, 91540-000, Porto Alegre RS, Brazil

autor

Sayao J.M.

• Centro Academico de Vitoria, Nucleo de Biologia, Rua do Alto Reservatorio s/n, Bela Vista, Universidade Federal de Pernambuco, Vitoria de Santo Antao PE, Brazil

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