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M ollusca

M ollusca. General Structure. Bilaterally Symmetric Coelomates Presence of a body cavity Endothermic Triboblastic Endodermic, ectodermic, and mesodermic tissues Cephalization  is evident Neurons concentrate in a ganglial pattern. General Diagram. Body Systems. Digestive System

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M ollusca

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  1. Mollusca

  2. General Structure • Bilaterally Symmetric • Coelomates • Presence of a body cavity • Endothermic • Triboblastic • Endodermic, ectodermic, and mesodermic tissues • Cephalization is evident • Neurons concentrate in a ganglial pattern.

  3. General Diagram

  4. Body Systems • Digestive System • Special radula - a belt-like chitonous sheath bearing recurved teeth • Stomach, digestive gland branches to digestive tract • Nervous System • Chemosensory organs (gastropods, bivalves), image-forming eyes (cephalopods) • Circulatory & Excretory System • Heart, arterial & venous system • Gills well developed, except for pulmonate snails which have a specialized vascular "lung" (a highly modified mantle cavity) • Functional anus

  5. Digestive System

  6. Nervous System

  7. Circulatory System

  8. Development & Life Cycle • Protostomes • The trochophore larval stage is followed by a free-swimming veliger larva in most species.

  9. Mollusks • Snails • Slugs • Octopus • Cuttlefish • Chitons • Tusk shells • Oysters • Squids.

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