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6 Cards in this Set
- Front
- Back
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Class Amphineura (Chitons)
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-Very prominent ventral foot, reduced head, prominent radula, lack eyes and tentacles
-Mostly marine, crawl across rocks while scraping algae off |
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Class Scaphopoda (Tooth/Tusk Shells)
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-Mostly west coast, marine, buried in mud and sand
-Tentacles for feeding, edible, Native Americans used shells for money |
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Class Gastropoda (Stomach Foot)
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Snails, Slugs, Limpets, Nudibranch
-Prominent head with sense organs and a ventral foot -Many breathe with gills, in land snails gills dissapeared and mantle cavity functions like a lung called a pulmonate -Torsion: intestine twirls up shell and they shit behind their head -Most have very prominent radulas and can drill through shells -Slugs and Nudibranchs are basically snails without shells |
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Class Bivalvia (Pelecypoda)
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Hard/Soft Shelled Clams and Oysters
-Bivalve (2 shells) molluscs, mostly marine few are fresh -Lack a head, prominent mantle, foot for burrowing -Move water over their gills through incurrent (in) and excurrent (out) siphons -Ant/Post adductor: close the valves -Ant/Post retractors: draw in the foot -Ant/Post Protractors: extend the foot |
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Class Cephalopoda
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Squids, Octupus, and Nautili
-Nautili has a secreted shell sorrounding body, other reduced to a "pen" sunken into body -Funnel and tentacles are derived from the foot |
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Phylum Mollusca
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-Body is unsegmented
-Anterior head, ventral foot, dorsal visural mass, mantle: layer of tissue which surrounds body mass -Calcium carbonate shell secreted by mantle -Breathe by gills or lungs -Radule: anterior oral cavity used to scrape away algae |
