Mollusks Phylum Mollusca Bottled specimens. Kingdom: Animalia Phylum: Mollusca Class :

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Presentation transcript:

Mollusks Phylum Mollusca Bottled specimens

Kingdom: Animalia Phylum: Mollusca Class :

Phylum Mollusca

Snails, clams, squid, octopus, and nudibranchs (sea slugs). Soft body, which is protected by a calcium carbonate shell in gastropods and bivalves, internal “pen” in squid. Octopus, are all soft bodied. Body covered by mantle which produces shell. Bilateral symmetry Muscular foot Gills for O 2 absorption

Kingdom: Animalia Phylum: Mollusca Class : Gastropods

Class Gastropods: “stomach-foot” Single shell or no shell - can retract body and cover with operculum. Snails, limpets, abalone, cone shells, nudibranchs (sea slugs) which has no shell. Sea hare has small shell surrounded by tissue.

Many are herbivores with rasping radula Some carnivorous, drill hole in clam with radula. Cone shells have toxin in radula, harpooning small fish; this toxin may make a good painkiller. Reproduction: Many hermaphroditic / fertilization internal / development external, some produce egg cases

Kingdom: Animalia Phylum: Mollusca Class : Bivalvia

Bivalves : two shells Clams, mussels, and oysters Their bodies are compressed between two shells. They are filter feeders, drawing water in through their siphon. Two Adductor muscles close hinged shells. Scallops have one big muscle. Mantle contains glands that secrete CaCO3 shells. Oysters secrete cement for attachment also covers sand grain to make pearl. Mussels attach by byssal thread.

Each line on clamshell represents about one year of growth. Wide bands may represent favorable growing conditions. Giant clams grow 60 years and can weigh 500 kg or 1000 lbs. Movement: Scallops open/close to make current “swim”. Clams dig with muscular foot; some can burrow through wood. Reproduction: Separate sexes release eggs and sperm, external fertilization and development.