Mexichromis macropus from Sydney

March 28, 2001
From: Erik Schloegl

Dear Bill,
Here's a nudibranch which I think is Mexichromis macropus, though it also looks similar to one of the pictures you have of Mexichromis mariei - it's unclear to me whether this specimen can be considered to have "a border of radially arranged orange or yellow lines", as you write.

The photo was taken at Ship Rock, Port Hacking, Sydney, New South Wales, on 26 March 1998, at a depth of 14m on a rock wall covered with invertebrate growth. It was about 2-3cm long. Unfortunately it is the only photo I took so the mantle edge isn't that clear
Best wishes,

Schloegl, E., 2001 (Mar 28) Mexichromis macropus from Sydney. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Erik,
Thanks for the M. macropus photo. In general the border in M. festiva is either a solid or broken line around the edge, while in M. macropus there are usually a series of short yellowish lines lying at right-angles to the edge. M. mariei, can look a bit like your animal but the purple border to the foot is submarginal. However, if you look at the messages concerning the various 'species' of Mexichromis in the Indo-Pacific you will see I am growing more tentative as time passes. Whatever it is, it is a nice photo of its favorite food sponge.
Bill Rudman.

Rudman, W.B., 2001 (Mar 28). Comment on Mexichromis macropus from Sydney by Erik Schloegl. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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