Nanaimo Dorid

Acanthodoris nanaimoensis

Acanthodoris nanaimoensis is a small nudibranch that typically reaches a maximum length of 2.5 cm. This shell-less marine gastropod features a distinct body shape associated with the family Acanthodorididae, which allows it to blend into its surroundings. It is often found in the eastern Pacific region, ranging from Alaska to California, specifically from Halibut Point, Baranof Island, to Purisima Point, Santa Barbara. The species inhabits benthic environments, often residing in lagoons and rocky substrates, where it can be observed at various depths, although specific depth ranges are not documented. Divers may encounter this nudibranch at various dive sites along its range.  The Nanaimo Dorid primarily feeds on compound tunicates, utilizing its specialized feeding apparatus to graze on these organisms. As a simultaneous hermaphrodite, it engages in unique mating behaviors, where individuals exchange roles as male and female, leading to fertilization. Eggs are laid on the substrate, developing into a planktonic larval stage before maturing into adults. Divers may find this species resting on the ocean floor or slowly moving across the substrate, often camouflaged against the rocky backdrop.  Currently, Acanthodoris nanaimoensis has not been evaluated by the IUCN, leaving its conservation status uncertain. However, divers should be mindful of their surroundings to help protect this and other marine species in their habitats.