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mollusks
Land and aquatic invertebrates (more than 100,000 species) with soft nonsegmented bodies; they usually secrete a calcareous shell.

univalve shell image

univalve shell
Land or aquatic mollusk having a foot and head, which retract into a spiral shell made of a single piece.

snail
Hermaphrodite herbivore land mollusk having a spiral shell; some species of snails are edible.


morphology of a snail	anatomy of a snail

bivalve shell image

bivalve shell
Aquatic mollusk without a defined head but having a foot, which retracts into a shell formed of two interarticulated parts.


morphology of a bivalve shell	anatomy of a bivalve shell

octopus
Carnivorous marine mollusk with a head bearing eight powerful arms covered with suckers; the octopus can change color to camouflage itself. Certain species are edible.


morphology of an octopus	anatomy of an octopus