Abstract—

Based on examination of the collection of stemmed echinoderm holdfasts from the Ordovician of the Leningrad Region (Russia), all holdfasts are divided in two large groups: “unbranched” and “branched”. In total, 11 morphotypes of unbranched holdfasts are identified and described in detail.

中文翻译：

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列宁格勒地区奥陶纪的茎棘皮动物的直支

摘要—

基于对列宁格勒地区（俄罗斯）奥陶纪的棘皮棘皮动物固定物的收集检查，将所有固定物分为两大类：“未分支”和“分支”。总共确定并详细描述了11种非支化固着型。