The gastropods old
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The gastropods old

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The gastropods old The gastropods old Presentation Transcript

  • The Gastropods Phylum Mollusca
  • Class Gastropoda – “Stomach Foot” -Extremely diverse and numerous group of animals -Many are snails, but there are species without shells or without coiled shells
  • Examples:• Whelk – can be large, predators• Conch – can be large, wind instruments• Periwinkle – very common snail in our area• Nudibranchs – no external shell (interior one made of protein)• Limpets – not coiled like most snails; conical or relatively flat• Slipper Snail – can change from male to female• Abalone – used for jewelry
  • Anatomy• Most have a spiraling shell surrounding a soft bodied animal• Well defined head, ganglia, no hearing• Excellent sense of smell/taste• Gills to take oxygen from water• Trap door (operculum) to protect animal when withdrawn in its shell• Mantle secretes the shell• Bilateral symmetry
  • Habitat• Benthic – Motile – Epifauna –live on seafloor – Have adapted to almost every marine environment in the world (i.e., rocks, sand, mud, etc.)
  • Feeding-Most are scavengersusing radula toscrape algae off rocksor decaying animalmatter from thebottom-Some are predators Ex: cone snailhttp://www.youtube.com/watch?v=zcBmMPJrrKk
  • Some of Feeding cont.predatorysnails feed bydrilling a holein anotherMolluskExamples:moonsnail, oysterdrill
  • Radula in Action
  • Bivalve Reproduction -Separate sexes -External fertilization and development -Distinct egg cases
  • Nudibranchs - Sea Slugs• Most brightly colored to ward off predators• Many have little outgrowths that are part of their respiratory system
  • Snail Internal Anatomy