BIO 2135 Study Guide - Midterm Guide: Exon, Invagination, Guanine
Document Summary
Ancestrula: the founding zooid that undergoes asexual budding to form a bryozoan colony. 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. Cecum: a blind pouch-like commencement of the colon in the right lower quadrant of the abdomen at the end of the small intestine. The appendix is a diverticulum that extends off the caecum. The cecum marks the beginning of the large intestine and is basically a big pouch that receives waste material from the small intestine. Coleom: a true body cavity completely lined by mesoderm, which forms the peritoneum. Animals with true coeloms are referred to as eucolomates. Cystide: in bryozoan (ectoproct) colonies the cystid consists of the nonliving shell, or casing, and the living part of the animal that secretes the casing.
