Molluscs {gastropod} {univalve} {gastropoda} include snail, limpet, abalone, and slug. During development, they twist so anus is above head. They have one heart, one gill, one kidney, one gonad, one valve, and one muscular foot.
Gastropods {abalone} can have large colorful shells.
Tropical gastropods {conch} can have spiral shells.
Small shelled gastropods can stick to tidal rocks {limpet}.
Large gastropods {triton} can have spiral shells.
Marine slugs and marine snails {nudibranch}| have no shells.
Sea snails {cone snail} can make peptide toxin {cone snail venom} {conantokin} that paralyzes fish or molluscs by affecting calcium-ion channels. Cone snails shoot out one tube with poison at end. 500 species have 50,000 different peptides.
Marine gastropods can have no shells {sea slug} {marine slug}.
Marine gastropods {pteropod} {sea snail, mollusc} {marine snail} are small.
Land nudibranchs {slug, mollusc} have no shells.
Nudibranchs {snail, mollusc} can live on land or in water. Land nudibranchs have shells.
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Date Modified: 2022.0225