With records from Otago, in the south of the South Island, to Leigh, north of Auckland, this species probably occurs throughout New Zealand. It is very rare intertidally, mainly found subtidally to about 20m where it can be quite common.
Nursery Cove, Poor Knights Islands, New Zealand, 12m, January 1998.
PHOTO:Ross and Diane Armstrong.
Grows to about 60mm long.
• Miller, M.C. (1971). A new genus and species of the nudibranch family Janolidae (Mollusca; Gastropoda, Opisthobranchia) from New Zealand waters. Journal of Natural History, 5: 491-498
Rudman, W.B., 1998 (August 10) Galeojanolus ioannae Miller, 1971. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/galeoion