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PHYLUM MOLLUSCA

PHYLUM MOLLUSCA. Phylum characteristics. More species of mollusca than any other group in the ocean, 110,000 living species. Bilateral symmetry Complete digestive tract. Respiration may be surface exchange, gills or lungs. Nervous system is cephalized; ganglia

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PHYLUM MOLLUSCA

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  1. PHYLUM MOLLUSCA

  2. Phylum characteristics • More species of mollusca than any other group in the ocean, 110,000 living species. • Bilateral symmetry • Complete digestive tract. • Respiration may be surface exchange, gills or lungs. • Nervous system is cephalized; ganglia • Soft body protected by a calcium carbonate shell which is secreted by a mantle.

  3. CLASSES Bivalve Gastropoda Cephalopoda

  4. Class Bivalve • EX. Clams, oysters, mussels, scallops • 2 shells joined by a ligament • Anterior & Posterior adductor muscles • Filter feeders • Lack Radula

  5. Class Gastropoda • Largest group of mollusca • Torsion • Larvae start as bilateral but because of torsion become asymmetric. • Many have an operculum • Ganglion and eyes • Dioecious or hermaphroditic. Sperm-darts

  6. Who are they? (conch, abalone, murex, cowrie, cones)

  7. Class Cephalopoda • ‘Head-foot’ • Most complex brain of all invertebrates. • 90+ tentacles • Beak inside buccal cavity • May have internal shell or lack shell entirely. Only 1 in this class has an exterior shell. • Chromatophores

  8. SQUID Dissection

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