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Lobiger viridis  Pease, 1863

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On a divesite called "Pier" at Siquijor Island was a large field of that algae, identified by Bill Rudman as Caulerpa racemosa (approx. 5 square meters) and I discovered first this egg mass, then I looked for its producer and found the Lobiger viridis (2). The other specimen was found during a nightdive on a divesite called "Lighthouse" at Cabilao Island hidden in a different kind of algae. There was no more power in the batteries of my camera so I picked up a branch of that algae and collected the sea-slug. To my surprise there were 2 specimens in my vessel! I did the shot during the next dive at "Busstop". When I disturbanced the larger animial it rapidly unrolled the parapodial tentacles to display bright colour patches. 
The experts have no consens whether Lobiger viridis Pease, 1863 is a synonym of Lobiger souverbii P. Fischer, 1856 or not. There is the consens, that both species might have the same colour variants (with blue lines or without), some scientists (Terrence M. Gosliner, William B. Rudman, Kathe R. Jensen, et al.) see Lobiger viridis as a species of the tropical Indo-Pacific and Lobiger souverbii as a species of the tropical Western Atlantic Ocean and of the Eastern Pacific Ocean, Dr. Richard C. Willan sees them as one world-wide species.
All recent DNA based reseaches on other families and genera have shown, that those species with a suspected world wide distribution often turned out to be a complex of distinct species, I guess L. viridis is also distinct.
A picture of the unrolled parapodial tentacles and more informations on Lobiger viridis are at Bill Rudman's Sea-Slug Forum!