Abstract

The hybocrinid crinoid Trecrinus schmidti gen. et sp. nov. is described from the Middle Ordovician (Uhaku Regional Stage, Darriwilian) of the lower reaches of the Volkhov River. Three long arms in the A, D and C radii, and a low cup with a flattened base without a stem are the main characteristics of the new genus. Morphology of the new genus emphasizes the similarities and differences in the morphogenetic capabilities of the hybocrinid lineages, which simultaneously developed on the Baltica and Laurentia paleocontinents, separated from each other in Ordovician. In the pronounced tiering of the Valim benthic community, this new genus occupied the lowest bottom stage.

中文翻译：

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来自沃尔多夫河上拉多加·格林特中奥陶纪的新的葫芦属（棘皮纲，crinoidea）

摘要

葫芦状海百合Trecrinus schmidti gen。等 十一月 是从Volkhov河下游的中奥陶纪（Uhaku地区阶段，Darriwilian）描述的。该新属的主要特征是，A，D和C半径的三个长臂以及一个底部平坦且没有茎的低杯。新属的形态学强调了hybrcrinid谱系在形态发生能力上的相似性和差异，hybrcrinid谱系在波罗的海和Laurentia古大陆上同时发展，在奥陶纪中彼此分离。在Valim底栖生物群落的明显分层中，这个新属占据了最低的底层阶段。