原口动物类群包括软体动物和环节动物。

The protostome group includes mollusks and annelids.

土壤动物有节肢动物门 、 软体动物门 、 环节动物门等12个目或类.

The results indicated that there were twelve groups of soil fauna, Arthropoda, Mollusca, Annelida etc.

如果它真的属于不同的门类，那么这个种群又如何连接软体动物、环节动物和节肢动物呢？

If, indeed, it did belong to a different phylum, how did that group connect to the molluscs, annelids and arthropods?

如果它真的属于不同的门类，那么这个种群又如何连接软体动物、环节动物和节肢动物呢？

If, indeed, it did belong to a different phylum, how did that group connect to the molluscs , annelids and arthropods?

浅谈环节动物身体的分节现象及其优点.

Discuss the metamerism of annelids and its advantages briefly.

前肠节肢动物或环节动物的消化道的第一部分，包括口腔、食管、嗉囊和砂囊。

The first part of the alimentary canal of an arthropod or annelid which includes the buccal cavity esophagus crop and gizzard .

前肠节肢动物或环节动物的消化道的第一部分，包括口腔、食管、嗉囊和砂囊。

The first part of the alimentary canal of an arthropod or annelid which includes the buccal cavity esophagus crop and gizzard.

二种环节动物皆具有闭锁循环系，包括管状的心脏及背血管，腹血管。用大头针标示二标本的下列构造：。

Both annelids possess a closed circulatory system with tubular hearts and a dorsal and ventral blood vessel. In both specimens, pin the following.