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Osteohistology of hyperodapedontine rhynchosaurs from the Upper Triassic of Southern Brazil

100%

Veiga F. H., Soares M. B., Sayao J. M.

Acta Palaeontologica Polonica

2015

tom 60

nr 4

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.

Formation of a stockpile of ova in ovaries of Vertebrates: limited and unlimited oogenesis

80%

Ogielska M.

Acta Biologica Cracoviensia. Series Botanica. Supplement

2014

tom 56

nr 1

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica. Supplement

1 Acta Palaeontologica Polonica

1 Ogielska M.

1 Sayao J. M.

1 Soares M. B.

1 Veiga F. H.

1 2015

1 2014

Wyniki wyszukiwania

Osteohistology of hyperodapedontine rhynchosaurs from the Upper Triassic of Southern Brazil

Formation of a stockpile of ova in ovaries of Vertebrates: limited and unlimited oogenesis