Oct 18 - Animals Lecture #10

O visceral mass portion mantle cavitiy serves as a

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o Visceral mass portion Mantle cavitiy serves as a protective cavity Respiratory organs: ctenidia – ciliated molluscan gills housed in mantle cavity Cillary function: Provide continuous water current into/out of cavity o Respiratory o Sensory detection o Prevent fouling o Waste elimination o Gamete dispersal Modified for filter feeding Polyplacophora – Gastropoda – resembles HAM more
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Bivalvia –
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Radula – firm ribbon of chitinous teeth arranged in rows Odontopore – cartilage like supportive structures o Both of these are part of buccal mass The buccal mass is the first part of digestive system, and consists of the mouth and pharynx.
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Reproduction and Developoment The majority of Molluscs are gonochroistic o i.e. Sexes are separate o Orange mussels are females and white mussels are males Exception to this strategy o Simultaneous hermaphrodites Eggs/sperm produced by single individual Gonad referred too as ovotestis Reciprocal copulation (some species form mating chains) o Protandrous hermpahrodites (e.g Crassostrea virginica) Individual changes sex from male to female Occurs as the organism grows older After changing to female, reversal may occur every few years Gamete exchange: o Internal fertilization Copulation occurs and gametes exchanged in genital ducts o External fertilization Gametes released o surrounding water Results in the development of free-swimming larval stages
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  • Fall '08
  • KELLY
  • mantle cavity, buccal mass, Hypothetical Ancestral Mollusc, Phylum Mollusca CH, Trochophore larval development

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