BIOL 1010 Lecture Notes - Lecture 48: Skidder, Scallop, Annelid
14 May 2017
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Document Summary
Terrestrial snails lack gills typical of aquatic molluscs; instead the lining of the mantle cavity functions as a lung, exchanges gases with air: most are marine. Slugs are unusual molluscs which lost their shell during evolution. Bivalves (bi double, valve leaf of a folding door) Have shells divided into 2 halves that are hinged together. 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. 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: differ from gastropods & bivalves in being adapted to the lifestyle of fast, agile predators.
