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Nembrotha sp. 01 is chracterized by its maroon background colour, by diffuse orange-reddish spots, and by a diffuse orange-reddish marginal line at the anterior part of the mantle. The gills are dark brown to black, with a white patch basally. The rhinophores are also dark brown to black, the elevated rhinophoral sheaths are maroon with an orange-reddish margin.
It is one of a group of similarly coloured species which are still a bit of a puzzle. There may be a number of species, or just some which are very variable in colour. Let me quote Bill Rudman:" There still seems to be some work needed on these red-spotted nembrothids."
It was originally posted at these websites as Nembrotha sp. A Genus: Bergh, 1877.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I have chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
More information on Nembrotha sp. 01 as Nembrotha spp? are at Bill Rudman's Sea-Slug Forum!