Onchidium

Onchidium is a genus of air-breathing sea slugs, shell-less marine pulmonate gastropod mollusks in the family Onchidiidae. There are only four species currently recognized in the genus.

Species
The following species with valid names are included within the genus Onchidium : Onchidium multinotatum, originally described within the genus in 1883, is regarded as a nomen dubium.
 * Onchidium melakense Dayrat & Goulding, 2019
 * Onchidium multiradiatum C. Semper, 1882
 * Onchidium nebulosum C. Semper, 1880
 * Onchidium reevesii (J. E. Gray, 1850)
 * Onchidium stuxbergi (Westerlund, 1883)
 * Onchidium typhae Buchannan, 1800