Neritopsina
The gastropod radiation... in miniature
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# of Described Species: around 400 First Appearance: Habitats: Marine, Freshwater, Brackish, and Terrestrial Shapes: Limpets, Slugs, highly spiraled Feeding Types: |
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# of Described Species: around 400 First Appearance: Habitats: Marine, Freshwater, Brackish, and Terrestrial Shapes: Limpets, Slugs, highly spiraled Feeding Types: |
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| Neritopsina contains several families which have marine, freshwater and terrestrial members. The largest family, Neritidae, includes many marine, brackish, and freshwater lineages. This family alone has probably invaded freshwater habitats at least 6 times (Holthuis 1996). The two terrestrial families, Helicinidae and Hydrocenidae, can be found as far back as the Devonian. | Neritopsines come in all shapes and sizes and can anything have coiled to limpet-shaped shells, with one species (Titiscania) being a slug. This group was previously included within the "Archaeogastropoda". The shell is never nacreous and an operculum is present in adults. The radula has many teeth in each row. |
