Bryozoan fauna from the Samnuuruul Formation (Upper Devonian, Famennian) of the Hushoot Shiveetiin gol section, southwestern Mongolia

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Abstract

The bryozoan fauna from the Samnuuruul Formation (Upper Devonian, Famennian) of the Hushoot Shiveetiin gol section, southwestern Mongolia comprises nine species including two cystoporates, two trepostomes, two cryptostomes, and three fenestrates. One fenestrate species is new: Hemitrypa lui n. sp. The majority of species show palaeobiogeographic connections to the Middle Devonian to Upper Devonian successions from China, Russia and Kazakhstan. The studied fauna is numerically dominated by the cystoporates Cyclotrypa subtilis (Nekhoroshev, 1977) and Sulcoretepora hextolgayensis Xia, 1997, whereas other species are relatively rare. The bryozoans develop exclusively arborescent growth forms implying a low energy setting of the outer shelf.

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