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Halgerda sp. 01  Genus: Bergh, 1880

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Species in the genus Halgerda are usually differentiated by their colour patterns. At present it is difficult to determine whether Halgerda sp. 01 is a colour variant of Halgerda willeyi without yellow lines, in this case Halgerda willeyi has a very variable colour pattern, if not there is a number of very similarly coloured species.
It was originally posted at these websites as Halgerda sp. A  Genus: Bergh, 1880.
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 Halgerda willeyi are on Bill Rudman's Sea-Slug Forum!