Chromodoris willani or C. lochi?

March 4, 1999
From: Gordon T. Smith

Dear Bill,

Hi, I am pretty new to the net so please bear with me if I screw things up sending files etc.

I have a shot that I identified using Helmut Debelius' book as Chromodoris willani (p203)and enclose it with this message. Can you confirm this as I have been informed that it is possibly C. lochi.

I have built a website which includes many nudibranch shots:


Smith, G.T., 1999 (Mar 4) Chromodoris willani or C. lochi?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Gordon,
I had a look at your interesting site last week and meant to let you know that your Plakobranchus is in fact a species of Elysia but I'm not sure which one.

Concerning your photo. It is Chromodoris lochi rather than C. willani. By chance I have a photo of the two together, taken by Richard Willan from Efate Is, Vanuatu, 18m, July 1976. The top animal is the holotype of Chromodoris willani and the lower one is Chromodoris lochi.

The main external distinguishing character of
Chromodoris willani is the white patching all over the translucent gills and rhinophores. If you have a look at the page on Chromodoris willani you will see I have included closeups of these structures so you can see the colour pattern. I have included some pictures of Chromodoris lochi at the top of this page above your message.

If you want to send any other unknown pictures, or interesting shots, to the Forum I would be glad to have them, especially things from the Red Sea and surrounding areas.
Best wishes,
Bill Rudman.

Rudman, W.B., 1999 (Mar 4). Comment on Chromodoris willani or C. lochi? by Gordon T. Smith. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Chromodoris lochi

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