The complete exterior of the body is covered in black rings connected by a series of black lines.
Most commonly found in the low intertidal through summer and autumn.
This large Sea Slug feeds primarily on sponges.
If threatened can discharge a dark purple inky "substance." Stringy egg masses can sometimes be seen. This is the most common Sea Hare found in the Northern NZ. It is unable to swim and the shell is flattened and completely internal. It is cosmopolitan in all tropical and subtropical seas.
NZ Molluscs: Powell
NZ Coastal Marine Invertebrates; Vol 1