Helisoma

Helisoma is a genus of freshwater air-breathing snails, a pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.

Synonym: Helisoma snails are an intermediate host of Megalodiscus temperatus.
 *  Carinifex Binney, 1864

Species
Species within the genus Helisoma include:
 * Helisoma anceps, sometimes known as Planorbella anceps
 * Helisoma campanulatum (Say, 1821) : synonym of Planorbella campanulata (Say, 1821)