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Phylum Mollusca

Phylum Mollusca. The Mollusks. More than 110,000 described species Very diverse, including snails, clams, squid, etc Found in all environments and range in size from microscopic to huge. Mantle : thick epidermal sheet covering the dorsal side of the body, makes the shell

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Phylum Mollusca

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  1. Phylum Mollusca The Mollusks

  2. More than 110,000 described species • Very diverse, including snails, clams, squid, etc • Found in all environments and range in size from microscopic to huge

  3. Mantle: thick epidermal sheet covering the dorsal side of the body, makes the shell • Foot: used for locomotion • Radula: rasping, tongue-like structure used for feeding The Mollusk body plan is complex and varied

  4. Gas Exchange: Most have gills, terrestrial species have primative lung • Circulation: 3-chambered heart with open circulation, closed circulation (veins and arteries) in Cephalopods • Excretion: Nephridia • Digestion/feeding: diverse with a radula, beak, or a siphon and filter. Digestive system is complete • Reproduction: sexual, some species are hermaphroditic. Many have a larval stage • Response to environment: Adapted to wide variety of habitats and feeding strategies, Cephalopods can shoot a cloud of ink to startle predators • Movement: muscular foot in most, jet propulsion in Cephalopods

  5. Class Gastropoda: Snails and Slugs (“stomach-footed”) Kevin Lee http://imamook.wordpress.com www.kent.edu www.takingoff.org

  6. Class Gastropoda: Snails and Slugs

  7. Class Gastropoda: Snails and Slugs

  8. Class Gastropoda: Snails and Slugs www.photec.co.uk

  9. Class Bivalvia: Clams, mussels, and cockles (“two-valves”)

  10. Class Bivalvia: Clams, mussels, and cockles (“two-valves”) www.nano-reef.com

  11. Class Bivalvia: Clams, mussels, and cockles (“two-valves”) Unknown source

  12. Class Cephalopoda: Squid, Octopuses, Cuttlefishes, and Nautiluses • “head-footed” Unknown source

  13. Class Cephalopoda: Squid, Octopuses, Cuttlefishes, and Nautiluses Wallpaperden.com

  14. Class Cephalopoda: Squid, Octopuses, Cuttlefishes, and Nautiluses David Harasti

  15. Class Cephalopoda: Squid, Octopuses, Cuttlefishes, and Nautiluses Ingrid Taylar

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