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Most species of Rostanga are orange or red, and apparently take up colour pigments from their sponge food so that their colour exactly matches the sponge they are feeding on. Individual animals show a close resemblance to their food sponge. This means that colour can vary within a species quite considerably if the sponge they feed on is itself variable in colour, or if the species feeds on a number of species of sponge. External differences can be found in the shape of the rhinophores and in biological characteristics such as nature of egg mass, size of eggs, and food sponge.
Internally, the radular morphology is the most useful character.
I label it Rostanga sp. 02 Genus: Bergh, 1879, as long as I am not sure. Distinctive are minute white spots near the margin of the mantle.
This species was posted on 4 June 2011 on these websites as Rostanga sp. B Genus: Bergh, 1879.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
More information on Rostanga spp.are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 9 January 2016, Rostanga sp. 02 Genus: Bergh, 1879
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Rostanga_sp_02.htm