opisthobranch

[动]n.后鳃目软体动物

后鳃动物（一类无贝壳的海洋软体动物）

名词

1、Opisthobranchs are a group of marine gastropods known for their vibrant colors and unique body shapes.

2、The opisthobranchs have a specialized structure called a rhinophore that helps them detect chemicals in the water.