BIO 2135 Study Guide - Final Guide: Hydrostatic Skeleton, Lophophore, Polypide
Document Summary
They are also referred to as the phylum. Ectoprocta: 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. In the lophophorate animals, the mesosome becomes the lophophore, the metasome the main body cavity, and the prosome is usually reduced to a small flap covering the oral opening or it is missing. Lophophore: the mesocoel extends into each tentacle held erect by hydrostatic pressure and moved by muscles inside. In bryozoans, lateral cilia create the current; when they contact particulate food, these cilia pass it down and toward the frontal cilia that pass it back to the lateral cilia. They continue to bat the particle of food back and forth until it reaches the mouth. coelomic fluid is the main circulatory fluid.
