Aplysia extraordinaria (Allan, 1932)

Distribution: 

Common in the Solitary Islands Marine Park. Known from the east coast of Australia and New Zealand.

Ecological Notes: 

Frequents bays and estuaries and may be locally common depending on availability of algal food source.

Additional Notes: 

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.

References: 

Gary Cobb, David Mullins, Nudibranchs Encyclopedia, 2nd Edition, 2015. Publishers Thomas Slone, Masalai Press and Tim Hochgrebe, Underwater Australasia. p.50.