pseudocoel
pseudocoelom

The body cavity is known as a "pseudocoel", or haemocoel.

The body cavity is reduced to a narrow pseudocoel.

A pseudocoelomate is any invertebrate animal with a three-layered body and a pseudocoel.

There is no circulatory system, although the body cavity (or pseudocoel) is well developed, and includes amoebocytes.

Originally gastrotrichs were thought to have a pseudocoel, but this was an artifact created by preservation methods, and they are now known to be acoelomate.

Unlike a true coelom, a pseudocoel is not fully enclosed by a cell layer derived from the embryonic mesoderm.

Like other nematodes, M. ozzardi is a cylindrical and bilaterally symmetrical worm, with a pseudocoel, or a false body cavity.

The other phyla have a pseudocoel, and share characteristics such as the structure of their jaws and pharynx, although these have been secondarily lost in the parasitic Acanthocephala.

The body cavity lacks a peritoneum, and therefore resembles the pseudocoel of animals such as nematodes, but is divided into one compartment on each side of the trunk, and additional compartments inside the head and tail.