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Thanks for identification of this specimen to Dr. Juan Lucas Cervera Currado.
There are pictures of a very similar species as Gastropteron sp. 2 at Robert F. Bolland's OKINAWA SLUG SITE, his Gastropteron sp. 1 looks also similar - the above specimens are possibly an undescribed species of Gastropteron.
More information on Gastropteron bicornutum are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 24 June 2016, Gastropteron bicornutum Baba & Tokioka, 1965
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Gastropteron_bicornutum.htm