Onchidium

Onchidium is a genus of air-breathing sea slugs, shell-less marine pulmonate gastropod mollusks in the family Onchidiidae.

Onchidium
Live animals of Onchidium melakense
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Systellommatophora
Family:	Onchidiidae
Genus:	Onchidium Buchannan, 1800[1]
Type species
Onchidium typhae Buchannan, 1800
Synonyms
Elophilus Labbé, 1935 (invalid: junior homonym of Elophilus Meigen, 1803 [Diptera]; Labbella is a replacement name) Labbella Starobogatov, 1970 Oncidium (incorrect subsequent spelling by Agassiz (1846))

Species

Some authors recognize only four species in the genus.^[2][3] The World Register of Marine Species lists six species as accepted.^[4]

• Onchidium melakense Dayrat & Goulding, 2019^[2]
• Onchidium multiradiatum C. Semper, 1882
• Onchidium nebulosum C. Semper, 1880
• Onchidium reevesii (J. E. Gray, 1850)^[3]
• Onchidium stuxbergi (Westerlund, 1883)^[3]
• Onchidium typhae Buchannan, 1800^[3]

Onchidium multinotatum, originally described within the genus in 1883, is regarded as a nomen dubium.^[5]