otter shell
noun
1- a burrowing marine bivalve mollusc with a relatively thin elliptical shell獭蛤。
1.1
- Genus Lutraria, family Mactridae: numerous species, including the common otter shell (L. lutraria).獭蛤属, 蛤蜊科：众多种, 包括普通獭蛤（拉丁名L. lutraria）。