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To my knowledge are the above pictures the only ones of of this species, it is not in IPN nor Gosliner et al. (2015) .
Pretty similar are
Costasiella kuroshimae which differs by a thin brownish-yellow median line from the eyes to the front of the head,
Costasiella sp. 01 which has also a black patch behind the rhinophores, it differs by the solid white rhinophores and lacks the subapical orange ring on the cerata
Costasiella sp. 02 which has also a black patch behind the rhinophores, it differs by orange pigment at the tips of the white rhinophores, and by minute orange and blue spots on the head.
Costasiella sp. 05 which differs by the rhinophores, basally opaque white, the outer 2/3rds are black with a diffuse median whitish patch.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch & Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
How to cite:
Köhler, E. (2020), published 20 December 2020, Costasiella sp. 03 Genus: Pruvot-Fol, 1951
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Costasiella_sp_03.htm