Function and attachment of the stem in Isocrinidae and Pentacrinitidae: review and interpretation
Function and attachment of the stem in Isocrinidae and Pentacrinitidae: review and interpretation
复制标题
Isocrinidae 和 Pentacrinitidae 茎的功能和附着：回顾和解释
DOI：
10.1111/j.1502-3931.1977.tb00591.x
复制
发表时间：
1977
期刊：
影响因子：
--
通讯作者：
H. W. Rasmussen
中科院分区：
文献类型：
--
作者：
H. W. Rasmussen
本文综述了对等海百合目中附着物的观察和解释。结果表明，等海百合成虫均丢弃其柱状体的末端，以末端纤毛附着于水底或水底物体上而存活。有时候，纤毛柱会在结下断裂，等纤毛柱会沿着底部漂移，直到它重新与纤毛连接。在不受干扰的环境中，柱的锥形远端部分的相当长的长度可以保持，并且几个样品可以通过位于底部的柱的缠绕远端部分连接。在德国霍尔茨马登的下侏罗纪Posidonia页岩中，附着在树干上的Seirocrinus subangularis标本被解释为假白垩纪。这些都是成年标本，在它们附着在树干上之前，它们的脊柱的远端部分被丢弃了。此外，由于成年标本不能游到水面，它们必须附着在位于底部的沉没树干上。
A review is given of observations and interpretations of the attachment in Isocrinida. It is concluded that all adult Isocrinida discard distal parts of their column and live attached by distal cirri to the bottom or to objects lying on the bottom. From time to time the column may break below a nodal and the isocrinid drift along the bottom until it regains attachment with the cirri. In undisturbed environments a considerable length of the tapering distal part of the column may be maintained, and several specimens may be connected by the entangled distal parts of the columns lying on the bottom. Specimens of Seirocrinus subangularis attached to tree trunks in the Lower Jurassic Posidonia shale of Holzmaden, Germany, have been interpreted as pseudoplanktic. These are all adult specimens with distal parts of their column discarded before they attached themselves to the trunks. Furthermore, since adult specimens cannot swim to the surface, they must have attached themselves to sunken trunks lying on the bottom.