Neritina spinosa G. B. Sowerby I, 1825 (original combination) Clithon spinosus [sic] (incorrect gender ending) Neritina undata Lamarck, 1822 Neritina inermis Martens, 1878 Clithon spinosum is a species of brackish water and freshwater snail with an operculum, a nerite.

[7] Clithon spinosum is a dioecious (it has two separate sexes) and amphidromous snail.

[3] Adults prefer boulders and cobbles over granules as a substrate.

[6] They can reach densities up to 57.0 ± 17.3 snails per square meter of a stream.

[6] Adults can survive 8 hours in seawater (longer exposure was not tested).