BIO 2135 Chapter Notes - Chapter DigiDiv: Zooid, Lophophore, Hydrostatic Skeleton
9 Feb 2017
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Sessile, form colonies, millions of asexually produced zooids. Make colonial mats that looks like moss. Zoarium = colony, zoecium = outer casing. Tripartite coelom with a prosoma, epistome, mesosome, lophophore, metasome. Can extend and retract their lophophore fluid filled cavity acts as a hydrostatic zoecium and living tissues that produce it lophophore and other moveable tissues skeleton for extending it, retractor muscles pull it back in. Funiculus: cord connecting the digestive system and wall of zooid in some bryozoan colonies exchange of materials between individuals in colony. Increase in size by asexual budding, from an original ancestrula. Cystid is the epidermis of the metasoma, which produces the zooecium (exoskeleton) Polypid and cystid which may be flexible or rigid. Polypid is the remainder of living tissues and organs lophophore, digestive tract, funiculus, reproductive organs, musculature. Mouth at the tip of the extended introvert. Lophophore surrounds the mouth of the extended introvert.
