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Lecture 48

BIOL 1010 Lecture 48: Lecture 48

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University of Manitoba
Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

o78P Bio 1010 Terrestrial snails lack gills typical of aquatic Molluscs; instead the lining of the mantle cavity functions as a lung, exchanges gases with air. o Most are marine. Slugs are unusual Molluscs which lost their shell during evolution. Long, colourful projections act as gills. Garden Snail Bivalves (bi – double, valve – leaf of a folding door) Include clams, oysters, mussels, & scallops. Have shells divided into 2 halves that are hinged together. Are suspension feeders. Mantle cavity contains gills used for feeding & gas exchange. The mucus covered gills trap fine food particles in water, & cilia sweep the particles to the mouth. Most are sedentary living in mud/sand. May use muscular foot for digging & anchoring. Mussels are sessile, secreting strong threads attaching them to rocks, docks & boats. Scallop can skidder across by snapping its shell ------------------ - Bluish eyes peer out between 2 halves of hinged shell. They are set into fringed edges of animal’s mantle. Cephalopods (kephale – head, pod – foot) o Differ from Gastropods & Bivalves in being adapted to the lifestyle of fast, agile predators. Chambered nautiles are d
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