Rose-Pink Cuthona

Cuthona divae

Cuthona divae is a small sea slug characterized by its rose-pink coloration. This aeolid nudibranch can reach a maximum length of 1.8 cm. It is often found on the Pacific Ocean coast of North America, ranging from Vancouver Island in Canada to Point Loma in San Diego, California. The species inhabits benthic environments and is typically encountered at depths shallower than 40 meters, with most records occurring under 30 meters. Divers may spot this nudibranch on rocky substrates or among hydroids, its primary food source. The diet of Cuthona divae consists mainly of hydroids, particularly Hydractinia and Clavactinia milleri. As a simultaneous hermaphrodite, this species engages in unique mating behaviors where individuals may alternate roles as male and female during reproduction. They lay eggs on a suitable substrate, which hatch into a planktonic larval stage before developing into adults. Encounters with Cuthona divae during dives can be interesting, as divers may find them camouflaged among hydroids. Their small size and coloration make them a notable sight. While the conservation status of this species has not been evaluated by the IUCN, it is recorded at several dive sites, suggesting it may be relatively common in its habitat.