Possibly common in the Solitary Island Marine Park. Widespread distribution throughout the Indo-Pacific region including Izu Peninsular in Japan, Philippines, Reunion and Christmas Islands in the Indian Ocean.
Found on algae, depth to at least 16 m.
Easily overlooked due to very small size, these animals have a fragile shell which is completely covered by the mantle. Specimen pictured around 3 mm in length, most records indicate this is approximate maximum size.
Australian Museum, Sea Slug Forum. http://www.seaslugforum.net/factsheet/colpthom. Accessed 21/07/18.
Gary Cobb, David Mullins, Nudibranchs Encyclopedia, 2nd Edition, 2015. Publishers Thomas Slone, Masalai Press and Tim Hochgrebe, Underwater Australasia. p.56.