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An organic body or cell having locomotion, as a spermatic cell or spermatozooid.

Of or pertaining to a zooid; as, a zooidal form.

One of the mobile male reproductive bodies in the antheridia of cryptogams.

One of the individual members of a compound ascidian. See Ascidioidea.

A kind of zooid of Siphonophora which has an elongated or even vermiform body, with one tentacle, but no mouth. See Siphonophora.

One of the secondary, and usually sexual, zooids produced by budding or fission from the primary zooids, in animals having alternate generations. In the tapeworms, the joints are deuterozooids.

One of the free-swimming sexual zooids of Siphonophora.

A sexual zooid, or medusoid bud of a hydroid; a gonophore. See Hydroidea, and Illust. of Campanularian.

A spermatozoid.

One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells.

A zooid of the third generation in asexual reproduction.

Applied to sexual zooids of hydroids, that have a saclike form and do not become free; -- opposed to phanerocodonic.

Growing with one side adherent to a stem; -- a term applied to the lateral zooids of corals and other compound animals.

ceous sac (Zoöl.), one of the peculiar cavities in the tissues of sponges, containing the zooidal cells.

The structure which unites together the ascidiozooids in a compound ascidian.

A division of Hydroidea in which the zooids are naked, or not inclosed in a capsule. See Tubularian.

In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. See Hydroidea, and Athecata.

An individual zooid of a bryozoan coralline, of which there may be two or more kinds in a single colony. The zooecia usually have a wreath of tentacles around the mouth, and a well developed stomach and intestinal canal; but these parts are lacking in the other zooids (Avicularia, Ooecia, etc.).

f most corals. Each is formed by a polyp. (b) One of the cuplike structures inclosing the zooids of certain hydroids. See Campanularian. [Written also calycle. See Calycle.]

A hydroid of the family ampanularidæ, characterized by having the polyps or zooids inclosed in bell-shaped calicles or hydrothecæ.