环节动物或昆虫的消化道中的类似扩大部分。

A similar enlargement In the digestive tract of annelids and Insects.

环节动物是柔软、黏湿的蠕虫，身体周围有环节。

Annelids are soft, moist worms which have rings around their bodies.

雌雄同体的陆栖和水栖环节动物，只在沿身体部位有鬃毛。

Hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body.

注意每只虫外部特徵的差异，观察环节动物1上众多的感觉构造及其多功能的附肢。

Note the differences in the external features of each worm, namely the increased number of sensory structures and the presence of multifunctional appendages on annelid 1.

共发现大型底栖动物38种，隶属7门8纲23科，主要为软体动物、节肢动物和环节动物多毛类。

We found a total of 38 species, belonging to 23 families, 8 classes and 7 phyla, most of them were arthropods and mollusks.