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Phylum Mollusca (Mullusks)

Phylum Mollusca (Mullusks). Soft-bodied animals that usually have an internal or external shell. Gastropods (snails & slugs). Bivalves ( 2 shells – clams, oysters, mussels, scallops ). Cephalopods (octopi, squid, nautilus). Food Source

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Phylum Mollusca (Mullusks)

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  1. Phylum Mollusca (Mullusks) Soft-bodied animals that usually have an internal or external shell

  2. Gastropods (snails & slugs)

  3. Bivalves (2 shells – clams, oysters, mussels, scallops)

  4. Cephalopods (octopi, squid, nautilus)

  5. Food Source • Herbivores, carnivores, filter feeders, detritivores or parasites Environment Some are aquatic, some terrestrial Some form symbiotic relationships with algae Some are parasitic

  6. Maintaining Homeostasis - Internal (Circulation, Respiration, Excretion) • Aquatic have gills • Terrestrial have no gills • Open circulatory system (does not mean that it goes to the outside) • Release nitrogen-containing waste in the blood in the form of ammonia Maintaining Homeostasis - External (Response) • Two-shelled mollusks have inactive nervous systems • Octopus and their relatives are active and intelligent predators that have the most highly developed nervous system of all invertebrates.

  7. Reproduction • Snails- external fertilization • Tentacled mollusks – internal fertilization • Some are hermaphrodites • Evolutionary Milestone • Coelom – body cavity located between intestinal canal and body wall Movement Snails- very slow by secreting mucus Octopus- very fast use a form of jet propulsion

  8. Vocabulary: mantle (702), shell (702), and siphon (703)Picture on page 703 figure 27-23

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