Applied to shells that possess two grooves or depressions; the ventral valves of brachiopods (Brachiopoda) are commonly bisulcate. The term is also applied to the venter, which has twin grooves, in some ammonoids (Ammonoidea).
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。