Freshwater pulmonates are hermaphroditic, which means the egg and sperm are produced in a single gonad but in different parts of the gonad. (Dillon, 2000) The pulmonates mainly reproduce sexually. (Dillon, 2000)

      In the genus Vertigo, the snails have a head with no tentacles. (Pilsbry, 1948) They have genitalia with a well-developed penis and shortened prostate gland. (Pilsbry, 1948) These snails have a hermaphrodite gland of two groups of lobules. (Pilsbry, 1948) They also have a smooth uterus, a long free oviduct, and a long spermathecal duct. (Pilsbry, 1948)