October 4, 2003
From: Rebecca F. Johnson
It was previously only known from Magic Island off Oahu in the Hawaiian Islands. I am quoting from our paper here ... "the most distinct external difference between these species (T. daniellae and T. kahuna) is the presence of large, visible mantle glands on the sides of the head anterior to the rhinophores and posterior to the gills in T. kahuna."
I am attaching am image of the the type specimen from Magic Island and a drawing of the mantle glands, so you can see the same mantle gland configuration seen in Keoki's picture. I am also attaching an image of the mantle surface of T. daniellae. This species does not have mantle glands that are visible without an microscope. Thorunna kahuna and T. daniellae also have different radular teeth. I am posting a picture of the radula and jaws of T. kahuna. The teeth have many more denticles than those of T. daniellae. Interestingly, the only two species of Thorunna with visible mantle glands, T. kahuna and T. australis also have very denticulated teeth.
Johnson, R.F., 2003 (Oct 4) Thorunna kahuna and T. daniellae. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11094
My mistake. I thought there was another species with a similar colour pattern but I am afraid my memory let me down. I have attached you radular photos in a separate message and posted a message with illustrations of the radula of T. daniellae. It is interesting how the mantle glands are so obvious in this species but apparently lacking in most others.
Re: Thorunna kahuna from Midway
From: Keoki Stender, October 5, 2003
Re: Thorunna daniellae from Midway
From: Keoki Stender, October 4, 2003
Radula of Thorunna kahuna
From: Rebecca Johnson, October 4, 2003
Thorunna daniellae from Midway
From: Keoki Stender, October 1, 2003