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This species is Hypselodoris sp. 6 in IPN at page 268
Pretty similar are:
Hypselodoris sp. 07 which differs by the colour of the gills
Hypselodoris sp. 10 which differs by the dark blueish-purple colour of the rhinophore clubs.
Hypselodoris bullockii which differs by the pale pinkish background colour, and by thin white marginal band
Hypselodoris apolegma which differs by the purple colour, and by the reticulate white edging of the mantle.
Thorunna halourga which differs by the broad white mantle margin, and by the low gill pocket.
This picture shows a specimen mating Hypselodoris sp. 07, this indicates they are most probably the same species, I keep them seperate for now. To make things more complicated: This picture shows a specimen very interested in a Hypselodoris sp. 01 specimen!
The photographer Gloria Femia Marzo writes on this specimen:"This one hasn´t head, but it was alive"
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.
How to cite:
Köhler, E. (2017), published 30 August 2017, Hypselodoris sp. 08 Genus: Stimpson, 1855
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Hypselodoris_sp_08.htm