Abstract
The bryozoan fauna from the Samnuuruul Formation (Upper Devonian, Famennian) in southwestern Mongolia contains sixteen species of which nine are described in detail from the Hushoot Shiveetiin gol section. The studied fauna comprises 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.