Basic body plan, 3 major structural components: foot, mantle and visceral mass, not segmented, mantle secretes shell & encloses mantle cavity, ctenidia (gills) in mantle cavity, radula for feeding, foot large and muscular
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Describe gas exchange for marine molluscs
Water flows over ctenidia where oxygen is transported into blood, partly in vessels, partly in haemocoel
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What are the 4 classes in molluscs?
Polyplacophora, gastropoda, bivalvia, cephalopoda
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Polyplacophora
"many shells' overlapping segmented shells and multiple ctenidia, marine herbivores, scraping algae off of rocks with radula, adults spend most of life attached to rocks, separate sexes, fertilisation usually in water but sometimes brood young
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Gastropoda
'Stomach fot', snails, limpets, slugs, torsion (visceral mass turns 180 during development), mantle cavity opens anteriorly, some can swim, radula often a scraper, modified in predatory gastropods, only class to have terrestrial members
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Bivalvia
'Two shells', muscle, clam, scallop, hinged pair of shells extends over sides and top of body, small head and no radula, many use foot to burrow into sand, fertilisation by expelling gametes in open water
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How do bivalvia feed?
Bring water in through one opening or siphon, extracting for from the water using ctenidia and expelling through another siphon, some 'vacuum clean' mud surface with long siphon
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Cephalopoda
Octopus, squid, cuttlefish, 'Head foot', all marine, mantle cavity and siphons arranged for jet propulsion, major active predators, highly developed brain and sense organs (especially eyes), separate sexes, die after breeding
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What type of cell allows Cephalopoda to camouflage?
Chromatophores generate camouflage colour and communicative patterns
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Other cards in this set
Card 2
Front
Describe gas exchange for marine molluscs
Back
Water flows over ctenidia where oxygen is transported into blood, partly in vessels, partly in haemocoel
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