Nematodes are round with a body cavity. They have one way guts with a mouth at one end and an anus at the other. They have a pseudocoelom that is lined on one side with mesoderm and on the other side with endoderm.

Is nematoda a Pseudocoelomate?

The pseudocoelomates include the nematodes, rotifers, gastrotrichs, and introverts. Some members of some other phyla are also, strictly speaking, pseudocoelomate.

Why do nematodes have a pseudocoelom?

Handbook - Pericellular Structures. Some structures with less well-demarcated anatomical features exist outside and around nematode tissues. ... This body cavity is called a “pseudocoelom” because it is not fully lined by mesodermal cells as in the true “coelomic cavity” of vertebrates.