There are two types of mollusc that are actively venomous.

有两种随时释放毒素的软体动。

To avoid sampling bias, they restricted their analysis to one group of animals—the bivalve molluscs—that fossilise well.

为了防止取样的偏颇，他们将分析的对象限制在一化石记录保存完备动——双壳软体动。

Many molluscs have tentacles.

很多软体动有触角。

Snails and octopuses are molluscs.

蜗牛和章鱼是软体动。

Unlike other molluscs, bivalves lack a radula and feature labial palps, which carry food from the gills to the mouth.

与其他软体动不同的是,双壳贝缺乏齿舌,具有唇瓣,可将鳃送到口部.