BIOL 1002 Study Guide - Midterm Guide: Madreporite, Echinoderm, Body Plan
Document Summary
You should know some of the basic characteristics of the following groups from chapter 33. Phylum porifera (sponges: suspension feeders, trap food with choanocytes, water movement through sponge is through the pore> spongocel>osculum. Class hydrozoa: mostly marine, alternate between polyp and medusa, hydras exist only in polyp form. Class scyphozoa (jelly fish: all marine, free swimming, medusa is predominant in life cycle, up to 2m in diameter. Class cubozoa (box jellies and sea wasps: all marine, box-shaped medusa, complex eyes, strong swimmers, highly toxic/lethal. Class anthozoa (sea anemones and most corals: all marine, most are sessile, many colonial, only as polyps. Light sensitive eyespots: centralized nerve net, gastrovascular cavity with 2 way pharynx. 2: parasites, complex lifecycles with alternating sexual and asexual forms, common in humans and snales. Lacks mouth and gastrovascular cavity: scolex(front end) attaches to host, absorb nutrients across worms body, proglottids are the reproductive structures that break off after fertilization.
