Onchidium
Onchidium is a genus of air-breathing sea slugs, shell-less marine pulmonate gastropod mollusks in the family Onchidiidae.
Species
Some authors recognize only four species in the genus. The World Register of Marine Species lists six species as accepted. Onchidium melakense Dayrat & Goulding, 2019Onchidium multiradiatum C. Semper, 1882Onchidium nebulosum C. Semper, 1880Onchidium reevesii Onchidium stuxbergi Onchidium typhae Buchannan, 1800Onchidium multinotatum, originally described within the genus in 1883, is regarded as a nomen dubium.