BSC 2011C Chapter Notes - Chapter 33: Gastrovascular Cavity, Mesohyl, Diploblasty
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Choanocytes line the interior of the spongeocoel and engulf bacteria and other food particles by phagocytosis h. ii. Concept 33. 2: cnidarians are an ancient phylum of eumetazoans: phylum cnidaria corals and jellyfish, gastrovascular cavity sac with a central digestive compartment b. i. Single opening functions as both mouth and anus b. ii. Polyps cylindrical forms that adhere to the substrate by aboral end of their body and extend their tentacles, waiting for prey (sessile) c. ii. Medusa moves freely in the water by a combination of passive drifting and contractions of its bell-shaped body c. iii. Muscle-like structures c. v. cnidocytes cells unique to cnidarians that function in defense and prey capture c. vi. Nematocytes specialized cnidae that contains a stinging thread that can penetrate the body wall of cnidarian"s prey. Concept 33. 3: lophotrochozoans, a clade identified by molecular data, have the widest range of animal body forms: flatworms in phylum platyhelminthes a. i. Cephalization evolutionary trend towards concentration of sensory and neural structure at one end a. ii.
