MORE MOLLUSKS VOCAB RADULA TONGUE covered with teeth

MORE MOLLUSKS VOCAB

RADULA TONGUE covered with teeth unique to mollusks Used to drill OR scrape food off surfaces NO RADULA IN BIVALVES Image from: http: //www. wildsingapore. com/chekjawa/text/i 900. htm#r

CHROMATOPHORES Pigments in the skin that help organisms blend in with their surroundings Image from: http: //www. biosbcc. net/ocean/marinesci/03 ecology/mlimg/mlpop. jpg

COELOM = body cavity In organisms with OPEN CIRCULATION coelom contains circulatory fluid (blood) = HEMOCOEL Blood = HEMOLYMPH Image: http: //fig. cox. miami. edu/Faculty/Dana/ham. gif

CLAMS http: //www. cinderzelda. com/czpics/potato 2. jpg Clams stay in one place = SESSILE Strain food from water = FILTER FEEDERS http: //www. 4 discountcookware. biz/market/15189

MARINE/FRESH WATER MARINE – live in salt water FRESH WATERlive in ponds, lakes, streams, rivers, etc. Image: http: //www. belizeanjourneys. com/grc/mangrove/man 2. jpg

TROCHOPHORE LARVA http: //www. okc. cc. ok. us/biologylabs/Documents/Evolution/Trochophore_larva. htm Found in all AQUATIC mollusks EXCEPT CEPHALOPODS http: //www. mbari. org/seminars/2003/summer 2003/august 4_rouse. html

http: //shells. tricity. wsu. edu/Archerd. Shell. Collection/Illustrations/Torsion. Stages. html TORSION in Gastropods Twisting of body 180° during development

CLASSES of MOLLUSKS Clam from: http: //www. geocities. com/The. Tropics/2428/directory. html BIVALVES http: //seattle. citysearch. com/feature/10243 http: //www. meddybemps. com/shells/2 draw_scallop. html Clams, oysters, scallops

BIVALVES • 2 SHELLS • FILTER FEEDERS • Only mollusks WITHOUT A RADULA • Only mollusks WITHOUT CEPHALIZATION • OPEN CIRCULATION • INDIRECT DEVELOPMENT with a TROCHOPHORE LARVA • SESSILE as ADULTS

CLASSES of MOLLUSKS http: //ippc 2. orst. edu/potato/grayslugs. jpg http: //mysticearth. us/images/conch. JPG http: //www. seaotter. com/marine/research/tritonia/diomedea/pics/pink_nudibranch. jpg Snails, slugs, conchs, nudibranchs

GASTROPODS • MOST HAVE 1 SHELL • MOST SLOW CRAWLING – VEGGIE GRAZERS with RADULA • CEPHALIZATION • OPEN CIRCULATION • Aquatic ones have INDIRECT DEVELOPMENT with a TROCHOPHORE LARVA • TORSION (twisting of body)

CLASSES of MOLLUSKS CEPHALOPODS http: //www. geocities. com/The. Tropics/2428/directory. html http: //www. seasite. niu. edu/indonesian/Themes/Animals/sea/images/cuttlefish. jpg

CEPHALOPODS • • MOST HAVE NO SHELL FAST SWIMMING CARNIVORES (RADULA) CEPHALIZATION Only mollusks with CLOSED CIRCULATION Only group with DIRECT DEVELOPMENT CHROMATOPHORES for camouflage MOST INTELLIGENT of the INVERTEBRATES Many have INK for defense