Iocrinid crinoids from the Ordovician of the Baltic Region, Estonia

被引：4

作者：

Ausich, W. I. ^{[1
]}

Rozhnov, S. V. ^{[2
]}

Kammer, T. W. ^{[3
]}

机构：

[1] Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA

[2] Russian Acad Sci, Borissiak Paleontol Inst, Moscow 117997, Russia

[3] W Virginia Univ, Dept Geol & Geog, Morgantown, WV 26506 USA

来源：

PALEONTOLOGICAL JOURNAL | 2015年 / 49卷 / 02期

基金：

美国国家科学基金会; 俄罗斯基础研究基金会;

关键词：

Disparid; crinoids; Ordovician; Baltic; ECHINODERMATA;

D O I：

10.1134/S0031030115020069

中图分类号：

Q91 [古生物学];

学科分类号：

0709 ; 070903 ;

摘要：

A new crinoid species, Ristnacrinus oepiki sp. nov., from the Upper Ordovician (Katian Stage, Keila Regional Stage) of northern Estonia (Vasalemma) is described. The morphology and taxonomic position of the genus Ristnacrinus are discussed. Ristnacrinus previously referred to eustenocrinids based on the presence of compound radials in each of five rays is transferred to the Iocrinidae, because in a new interpretation, only one ray (C) has a superradial plate. At present, nine genera from the Early Ordovician to Early Silurian are included in the family Iocrinidae. In addition, Schaldichocrinus Rozhnov, 1997 is designated as the correct spelling of the replacement name for Pariocrinus Rozhnov, 1988 (non Eckert, 1984).

引用

页码：145 / 152

页数：8

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