A clade of annelids proposed on the basis of recent molecular evidence. The sedentarians tend to be burrowing or tube-dwelling forms, in contrast to the more active Errantia, and include the leeches and earthworms. See Annelida.
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。