SCB 202 Lab Exam 2 Review SheetAnimals (Introduction to Animals, LM pp. 77-80)Multicellular heterotrophic eukaryotic organisms that obtain nutrition by ingestion and typically have contractile cells or true muscle tissue and neurons or a nervous system. For each phylumcheck: symmetry(asymmetry/radial/bilateral), number of tissue layers(none/diploblastic/ triploblastic), coelom(acoelomate/pseudocoelomate/coelomate), digestive tract (single opening/mouth & anus), presence of tissues/organs/organ systems, special types of cells(e.g. choanocytes in Porifera, cnidocytes in Cnidaria) & special features(metameric segmentationin Annelida & Arthropoda, exoskeleton & jointed legs in Arthropoda, mantle, shell & radula in Mollusca), basic life cycle, dioecious(sexes separate) or monoecious (hermaphrodite), sessile(attached) or free-swimming, free-livingor parasitic, cephalization, type of development (protostomeor deuterostome), classification within phylum (main classes), key features of classes within each phylum, examples. Be able to label main features of organisms you examinedor dissected in lab. See animal phyla handout and Powerpoint slides (on Blackboard) and Lab Manual for descriptions and illustrations. You will also find good photographs in your Photo Atlas and can find additional pictures on the web. You must know the key features of all the animal phylaand for some large phyla be familiar with the main classeswe discussed (e.g. within Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, Chordata).Phylum Porifera (Sponges) (LM pp. 80-83)No distinct symmetry, choanocytes (collar cells) line interior spongocoel, spicules and spongin fibers provide support; sessile (attached). Aquatic, mostly marine, some freshwater.Phylum Cnidaria (Hydra, Jellyfish, Sea Anemones, etc) (LM pp. 83-87)Radial symmetry, diploblastic (epidermis & gastrodermis) with jelly-like mesoglea between, stinging cells (cnidocytes), life cycle often involves polyp (sessile stage, asexual) & medusa (freeswimming, sexual), gastrovascular cavity (no anus). Mostly marine.