BIOL 112 Study Guide - Final Guide: Lophophore, Trematode Life Cycle Stages, Trochophore
27 Nov 2016
School
Department
Course
Professor
Document Summary
Describe how acoelomate, pseudocoelomate, and coelomate animals differ and give examples. Identify the characters that identify flatworms, lophophorates, molluscs and annelids. Molluscs - no lophophores; calcium carbonate shell. Annelids - segmented worms with septa; trochophore. Sessile vs mobile; depends on whether they burrow or attach. Identify the brachiopod clades and explain how they are adapted to their habitats. Lophophore - crown of ciliated tentacles that surround the mouth and serve a feeding function. Trochophore - larval stage present in annelids and molluscs. Auricles - projections on the side; sensory lobe. Ocelli - pigmented cups lined by sensory cells. Cups shade sensory cells from light in all directions but one. Rostellum - armed with two rings of hooks and a ring of four suckers holds it is place. Proglottid - segment; reproductive unit; formed by mitotic division in the neck area behind.
