Chromodoris lochi from Philippines [1]

March 30, 2009
From: Marcel Tanke

Dear Bill,
I believe the animals in the pictures in this and the next message [#22373], are all chromodorids. They are similar to Chromodoris boucheti, but lack the black line in the gills of that species. All pictures are from different animals.

Locality: Upper photo: Puerto Galera , February 2008;  Mid & lower photos: Anilao, Dec 2008 - Jan 2009.  Lengths: 2 - 5 cm. Photographer: Marcel Tanke.

Debelius and Kuiter, in their book "Nudibranchs of the world" (2007), call it Chromodoris sp 30.
It's not on your Forum yet?

Best regards,

Tanke, M.A., 2009 (Mar 30) Chromodoris lochi from Philippines [1]. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Marcel,

You will see on the C. boucheti Fact Sheet that I say that C. boucheti is 'very similar in colour to Chromodoris lochi and Chromodoris willani.' Your animals are almost certainly Chromodoris lochi. When I first described that species, the only specimens I had seen were from the southwestern Pacific and all of them had translucent - almost colourless - gills and rhinophores. Since then I have seen many specimens - both alive and in photos - with a distinct yellowish colouration to the gills and rhinophores or sometimes and orange pinkish tinge. The colour of your animals look quite like C. elisabethina without the orange border, but one difference is that in C. elisabethina the blue colouration stops at the outer black lines, while in C. lochi the blue extends out to the white margin. I am not sure why some specimens have a distinct yellow colour to the gills and rhinophores, it may be genetic or perhaps its a result of some pigment uptake from their sponge food. We have still a lot to learn.

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (Mar 30). Comment on Chromodoris lochi from Philippines [1] by Marcel Tanke. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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