Term
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Definition
| gastropoda(snails), bivalvia, cephalopoda, polyplacophora (chitin), scaphopoda (toothshell) |
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Term
| Mollusca embryonic development |
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Definition
| tripoblastic, protostome, schizocoelous, spiral cleavage, determinate cell fate, blastopore becomes mouth, coelom is reduced to paracardial coelom, trocophoric larvae |
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Term
| general parts of Mollusca |
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Definition
| head, mantle(mantle cavity contains gills), foot, visceral mass, rectum, pericardial cavity, valve, siphons, ligaments |
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Term
| Mollusca skeletal support |
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Definition
| soft bodied animals whose mantle sometimes secretes a shell |
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Term
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Definition
| foot/mantle is used for crawling, digging. cephalopods use jet propulsion. foot refractors are the small muscles in bivalves that open and shut the valves. large muscles are called adductors (anterior and posterior ones) |
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Term
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Definition
| paired ventral(enervates the foot) and dorsal(other organs) nerve cord. also have optional eyes, osphradia, statocysts, chemoreceptors, tactile organs |
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Term
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Definition
| muscular and regionalized, anus opens into mantle cavity. sometimes contains a chitinous tooth structure called a radula |
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Term
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Definition
| nephridial kidneys, pericardial coelom collects waste by filtering through heart wall |
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Term
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Definition
| mostly open. except cephalopods have a closed system with a 3 chambered heart |
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Term
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Definition
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Term
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Definition
| snails, limpits, conchs, whelks, nudibranchs; can be univalve; feeding by radula, torsion of body for protection; |
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Term
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Definition
| Prosobranchia - halve shells, opisthobranchia - nudibranchs, pulmonata - terrestrial snails and slugs |
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Term
| Torsion of Gastropoda bodies |
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Definition
| for protection, loss of gill in nudibranchs to prevent soiling, coiling of shell in others |
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Term
| types of coiling of gastropod shells |
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Definition
| planospiral: cinamon buns coiling in single planes, conispiral: tapering affect in 2 planes; coiling is dextral or sinistral; apex is the oldest part of the shell |
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Term
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Definition
| clams, oysters, scallops, muscles; laterally compressed, umbo = oldest part of shell. muscles are called adductor muscles, filter feeders (no head or radula), labial palps move food off gills to mouth, water flow through siphons. so gills are for respiration and feeding |
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Term
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Definition
| in bivalvia. ventral incurrent siphon water enters, then out through dorsal excurrent siphon. papillae are associated with the incurrent siphon |
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Term
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Definition
| closed circulatory system; predacious beak and radula; chromatophores, various shells; squids have spermatophore, no trcophoric larvae; |
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Term
| various shells of cephalopoda |
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Definition
| nautilis: heavy shell with internal chambers, squid: reduced to horny chitinous strip called a pen, cuttlefish: reduced to cuddlefish bone, octopus: lacks shell completely |
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Term
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Definition
| chitons; usually 8 plates for flexibility; dorso-ventrally flat; radula for algae feeders |
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Term
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Definition
| tusk or tooth shell, mostly sedimentary, bury with their foot, cilia and foot pumps water |
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Term
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Definition
| blunt end is anterior. siphons protrude from the posterior |
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Term
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Definition
| connects the two valves in the back of the bivalve |
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Term
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Definition
| move food off gills into mouth |
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