BIOL 1202 Chapter : Biology Chapter 33 Learning Objectives
Document Summary
Kingdom animalia there are 24 phylums in this kingdom but we are only studying 9 of them. Sponges are basal animals that lack true tissues . (concept 1) Phylum porifera (sponges) - no tissues; lack true tissues and organs; live in both kinds of water; asymmetrical body plan. Body parts: spongocoel, porocyte, epidermis, choanocyte, mesohyl, amoebocyte, osculum, and spicules. Cnidarians are an ancient phylum of eumetazoans. (concept 2) Phylum cnidaria- two tissues (diploblastic development); have a gastrovascular cavity (one opening that serves as the mouth and the anus). 2 body plans: polyp (the immobile form that"s cylinder-like and mouth up) and medusa (the mobile form that"s flattened version of poyp but mouth down). They have little stingers on them called cnidocytes that defend them and capture prey. Lophotrochozoans, a clade identified by molecular data, have the widest range of animal body forms. (concept 3) Class cubozoa (box jellies and sea wasps) medusa. Class anthozoa (sea anemones and most corals) polyp.
