Phylum comprising the priapus worms, known from Cambrian times (e.g. Ottoia from the Burgess Shale, Canada), and ranging up to the present.
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。