Noalda exigua from Portland, Victoria

February 19, 2010
From: Leon Altoff

Dear Bill

As you requested, here are some photos of Noalda exigua from our website

It was found at Anderson Point, Portland in western Victoria, Australia.  23 February 2007. Photos: Leon Altoff

I hope the photos are of value.

Leon Altoff

Altoff, L., 2010 (Feb 19) Noalda exigua from Portland, Victoria. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Leon,

Thanks for your rapid response. Apart from Bob Burn's sketches of a living animal in Burn & Thompson, 1998, your photos are the only information I have on the nature of the animal of this enigmatic species, which was described on the basis of an empty shell.

I am posting a message today [#23242] on a very similarly looking species from the Andaman Sea. It's colour is very similar but the shell is not as exposed as in N. exigua and the head looks a little different in shape. Perhaps they are the same, but without any anatomical information I think it is best to leave them apart until we can comare them anatomically.

  • Burn, R. & Thompson, T.E. (1998). Order Cephalaspidea. Mollusca: The Southern Synthesis. Fauna of Australia. P. L. Beesley, G. J. B. Ross and A. Wells. Melbourne, CSIRO Publishing. 5, Part B.: 943-959.

Best wishes,
Bill Rudman

Rudman, W.B., 2010 (Feb 19). Comment on Noalda exigua from Portland, Victoria by Leon Altoff. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Noalda exigua