Common in the Solitary Islands Marine Park. Known from the east coast of Australia and New Zealand.
Frequents bays and estuaries and may be locally common depending on availability of algal food source.
Recognised by the reddish orange colouration and dark vein-like markings. It is an active swimmer, and if disturbed produces a cloud of reddish purple ink. Large numbers may be washed ashore after storm events. Grows to 400 mm in length but more commonly 150 - 200 mm. Specimen in top photo approximately 220 mm, discovered in intertidal rock pool.
Gary Cobb, David Mullins, Nudibranchs Encyclopedia, 2nd Edition, 2015. Publishers Thomas Slone, Masalai Press and Tim Hochgrebe, Underwater Australasia. p.50.