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The first Triassic vertebrate fossils from Myanmar: Pachypleurosaurs in a marine limestone

100%

San K. K., Fraser N. C., Foffa D., Rieppel O., Brusatte S. L.

Acta Palaeontologica Polonica

2019

tom 64

nr 2

As ecosystems recovered from the end-Permian extinction, many new animal groups proliferated in the ensuing Triassic. Among these were the sauropterygians, reptiles that evolved from terrestrial ancestors and transitioned to a marine environment. The first sauropterygians were small, marine-adapted taxa such as pachypleurosaurs, which are known from Middle–Late Triassic deposits, particularly in the Tethyan realm of Europe, and more recently from Lagerstätten in southwestern China. Here we report two pachypleurosaurs from Myanmar, the first Triassic vertebrate fossils from the country. These specimens demonstrate that their entombing rocks in northern Shan State, which have received less study than terrestrial sediments in southern Shan State and whose ages have long been uncertain, are Triassic. The specimens may be among the oldest pachypleurosaurs globally, potentially corroborating biogeographic scenarios that posit an eastern Tethyan origin for pachypleurosaurs, and raise the potential for future discoveries of well-preserved Triassic reptiles in Myanmar.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Brusatte S. L.

1 Foffa D.

1 Fraser N. C.

1 Rieppel O.

1 San K. K.

1 2019

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The first Triassic vertebrate fossils from Myanmar: Pachypleurosaurs in a marine limestone