BIO 2135 Quiz: Bryozoan Keywords
21 Oct 2015
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Ancestrula: the founding zooid that undergoes asexual budding to form a bryozoan colony. Bryozoan colonies, called zoaria, increase in size by asexual budding and start with a single zooid, the ancestrula. Bryozoa: the moss animals, a major phylum of sessile aquatic invertebrates occurring in colonies with hardened exoskeleton. Unlike the other lophophorates, bryozoans can extend and retract their lophophore through an opening, in some species protected by an operculum. Bryozoans are sessile and form colonies of varied sizes and shapes and composed of anywhere from a handful to millions of asexually produced zooids all related to the founding organism, the ancestrula. Cilia on the surface of the tentacles create a water current that pulls water into the lohophore, and they trap food contained in the water, passing it down the length of the tentacle into the mouth. Unique colonies that grow by budding; body divided into polypide and cystid; introvert and funicular system.
