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8 Cards in this Set
- Front
- Back
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Mollusks |
2nd largest phylum in animal Kingdom -2 body parts: head foot and visceral mass -mantle that secretes shell and protects viscera -bilateral symmetry -coelom reduced |
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Mollusk characteristics: open circulatory system |
excpet in cephalopods |
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mollusk characteristics: radula |
used for feeding |
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Class Polyplacophora |
chitons -close to ancestreal design -shell consists of 8 dorsal plates -intertidal |
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Class Gastropoda |
-snails and slugs `shell coiled -undergo torsion -some monoecious (both sex organs) -aquatic and terrestrail |
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Class Bivalvia (pelecypoda) |
-clams, oysters, scallops -body enclosed in a shell of two valves, hinged dorsally -filter feeders: water enter through incurrent siphon -pericardial cavity is all that remains of the coelom -heart pumps blood to dorsal aorta and then to organs -sloshes around in sinuses -described as an open system -lacks caphalization-nervous system consists of ganglia connected by nerves -sexes seperate, fertilization produces a trochophore larva |
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Class Cephalopoda |
octopus, squid, cuttlefish, chambered nautilus -foot modified into a circle of arms and tentacles armed with suckers and/or hooks -shell reduced or absent -predatory-closed circulatory system -high developed ns |
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Cephalod Reproduction |
-male produces spermatophore -male introduces spermataphore inside mantle cavity of female with specialized arm |
