an internal body cavity of animals which is only partially surrounded by mesoderm as found in the Nematoda (cf. coelom)

A body cavity not surrounded by a peritoneum. Characteristic of nematodes and rotifers.

a body cavity that is lined by mesoderm on the outer side and endoderm on the inner side

a body cavity that surrounds the tissue of the endoderm layer of the cell

an internal space that does not develop from a space surrounded by mesoderm

In nematodes, a closed þuid-containing cavity that acts as a hydrostatic skeleton to maintain body shape, circulate nutrients, and hold the major body organs.