(zoology) An animal in one of its inferior or early stages of development, as one of the intermediate forms in alternate generation.
(zoology) One of the individual animals in a composite group, as of Anthozoa, Hydrozoa, and Bryozoa; "” sometimes restricted to those individuals in which the mouth and digestive organs are not developed.
In Rhabdopleura each zooid forms its own delicate tube composed of a characteristic series of distinct rings.
In correspondence with the fundamental constitution of the zooid, each of the three segments has its own body-cavity separated from the others.
- Zooid of tinued by its progeny, and thus gives Plumatella, with exrise to the mature colony.
In other Entoprocta the buds on a horseshoe retain a high degree of individuality, a shaped l o p h o - thread-like stolon giving off the cylindrical phore; stalks, each of which dilates at its end i, Ectocyst; into the body of a zooid.
On the degeneration of the polypide, its nutritive material is apparently absorbed for the benefit of the zooid, while the pig mented substances assume a spheroidal form, which either remains as an inert "brown body" in the body-cavity or is discharged to the exterior by the alimentary canal of the new polypide.