10 Name five characteristics of phylum Mollusca 11 Match the mollusc with the correct class of the phylum Mollusca Gastropoda A. Nautilun, octopus, squid, cuttlefish Bivalvia B. Whelks, limpets, nudibranchs Cephalopoda - C. Tusk shells D. Clams, scallops, oysters Polyplicophora Scaphopoda E. Chitons F. Slugs, snails, abalone 12 Identify which of the following are found in gastropods only, bivalves, only or both groups of molluscs, using the following key: G- Gastropods One-piece univalve B- Bivalves G/B Both gastropods and bivalves Two-piece shell (bivalve) Apex; as the animal grows, the successive whorls increase in size Muscular foot for locomotion Hump, or umbo, on the anterior end of the dorsal side of each shell valve Head, characterized by presence of two tentacles, each with an eye and radula for rasping Presence of adductor muscles hold shell together No head and radula 13 Why are cephalopods considered advanced molluscs? 14 This mollusc structure is a protrusible, tonguelike organ with "teeth" used for rasping of algae or drilling through shells. (Circle the correct answer.) a. Operculum. b. Umbo. c. Labial palp. d. Radula. e. Girdle. 575 C 29 Animal Planet Understanding the Lophotrochozoans the com Ceder