bivalve speculum双瓣窥器
bivalve molluse双壳软体动物
bivalve shells双壳类
bivalve ligament双壳纲韧带
fossil bivalve双壳类
freshwater bivalve淡水双壳贝;淡水双壳贝类
Bivalve larvae双壳类幼体
bivalve assemblage双壳类组合
N（名词） any marine or freshwater mollusc of the class Pelecypoda (formerly Bivalvia or Lamellibranchia), having a laterally compressed body, a shell consisting of two hinged valves, and gills for respiration. The group includes clams, cockles, oysters, and mussels 双壳类动物 (See also pelecypod, lamellibranch)
ADJ（形容词） of, relating to, or belonging to the Pelecypoda 软体动物的 (See also pelecypod, lamellibranch)