A very ancient crinoid (Crinoidea), or perhaps an ancestor of the crinoids, that lived in the Cambrian seas. It resembled crinoids, having a long stalk, cup-like calyx, and feathery arms with which it combed food from the water.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。