Abstract

A new species and genus of Choristitinae, Adventochoristites abavus gen. et sp. nov., is described from the Upper Serpukhovian of the Donets Basin and is considered as an ancestor of the Middle-Late Carboniferous Choristites linage. The characteristic features differing Alphachoristites from Choristites and Trautscholdia are specified. New species Alphachoristites berestovensis sp. nov. and Quizhouspirifer tshaikensis sp. nov. are established.

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