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Mollusca

Mollusca. Squids, and slugs, and snails, oh my. Includes:. Slugs Snails Squids Clams Oysters Scallops Albalones Conches Periwinkles Whelks Limpets Cowries Cones Octopi Cuttlefish Nautili Marine animals Freshwater living animals Terrestrial animals Sessile animals

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Mollusca

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  1. Mollusca Squids, and slugs, and snails, oh my...

  2. Includes: • Slugs • Snails • Squids • Clams • Oysters • Scallops • Albalones • Conches • Periwinkles • Whelks • Limpets • Cowries • Cones • Octopi • Cuttlefish • Nautili • Marine animals • Freshwater living animals • Terrestrial animals • Sessile animals • Mobile animals

  3. Um... What do all these have in common? • All have BILATERAL SYMMETRY • All are COELOMATES • All have TUBE-IN-TUBE digestive systems • All have a MUSCULAR “FOOT” – Used for mobility and/or grabbing hold of food • All have a MANTLE – An outside membrane that protects the mollusk. May secrete a shell.

  4. Classes of Mollusca • Gastropods – Snails, Slugs, Abalones, Conches, Periwinkles, Whelks, Limpets, Cowries, Cones • Bivalves – Clams, Oysters, Mussels, Scallops • Cephalopods – Octopus, Squid, Cuttlefish, Nautilus

  5. Gastropods • Largest class of Mollusks! Contains 80,000 species! • Use their muscular foot to move around • Feed by using their teethed tongue-like radulato drill into an dismantle food • Can be herbivores, predators, scavengers, parasites • Marine are usually separate sexes, terrestrial species are often hermaphrodites • In land species, often use “Love Darts” to get in the mood!

  6. Gastropod Systems • Nervous system: Ganglia, eyes, and advanced olfactory (smell) organs • Circulatory system: Open circulatory system with a small heart which pumps around hemolymph • Respiratory system: Gills in marine species, primitive lung in the mantle of terrestrial species • Excretory system: Contain Nephridia, which filter wastes from the coelom and excrete out the mantle

  7. Bivalves • Have two shells, made of calcium carbonate, held together by a ligament and controlled by muscles. • No developed head, do not use a radula. • Filter feeders! Push water through gills, which use cilia to sort out food and push it too the mouth. • Most have separate sexes (some are hermaphrodites) and expel sperm/eggs into the water  external fertilization

  8. Bivalve Systems • Nervous System: Very simple, basically a nerve net but with a few scattered ganglia, have light detectors • Circulatory System: Open, a three chambered heart pumps hemolymph around the body cavity • Respiratory System: Use Gills • Excretory System: Use Nephridia

  9. Cephalopods • Foot has evolved into tentacles which can capture and hold prey • Food is then bitten apart with a beak, and torn to digestible pieces by the radula • Move about using a “jet ski” like ability to shoot water out of their siphons • Some can also expel a dark fluid when threatened • Reproduce with separate sexes, often die afterwards • Live (grow) fast, die young

  10. Cephalopod Systems • Nervous System: Most intelligent invertebrates! Large brains and sophisticated nerve fibers. Very acute vision and hearing. • Circulatory System: Closed circulatory system, with one heart for the body and two for the gills • Respiratory System: Use Gills • Excretory System: Use Large Nephridia

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