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Tytthosoceros nocturnus Newman & Cannon, 1996. Tentative identification, but this was the only species with a complete black colour which I could find at the internet, Lindsay Warren agreed with the identification of this picture.
Let me quote the description of Tytthosoceros nocturnus by Marcela Bolanos at LifeDesks:
"Extremely soft and delicate body, elongated and oval, slightly tapered posteriorly and raised medially. Black or dark brown background with velvety appearance. The ventral side is light brown. Small pseudotentacles ear-like shaped with white or gray tips."
There are at least two other solid black flatworms: Pseudoceros cf. bolool Newman & Cannon, 1994, and Pseudoceros bolool Newman & Cannon, 1994, and a black species with minute white spots Pseudobiceros stellae Newman & Cannon, 1994.
How to cite:
Köhler, E. (2017), published 19 February 2017, Tytthosoceros nocturnus Newman & Cannon, 1996
available from https://www.Philippine-Sea-Slugs.com/Look-alike/Platyhelminthes/Tytthosoceros_nocturnus/Select.htm