Ocnus lacteus

Ocnus lacteus are gonochoric and each individual has only one gonad. Spawning and fertilization are external; some exhibit brooding. Embryos develop into planktotrophic larvae (auricularia) then into doliolaria (barrel-shaped) which later metamorphose into juvenile sea cucumbers.^[1]

It is found in western Ireland.^[5] It lives in northerly waters from the Arctic to the Mediterranean.^[2] It lives at depths up to 200 m (660 ft), living on the seafloor and crawling over algae and seaweed.^[6]