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Costasiella sp. 03  Genus: Pruvot-Fol, 1951

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Costasiella sp. 03 is characterized by a white body colour and by translucent white cerata which are densely covered with minute green and white spots, and have pointed translucent tips. Distinctive is the diffuse subapical orange ring on the cerata. There is some dark pigment near the tips of the white rhinophores. Behind the eye spots is a diffuse triangle shaped black patch . There is diffuse orange pigment on the head. There is black pigment at the bases of the rhinophores.
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 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.
References:
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. (2018), published 8 January 2018, Costasiella sp. 03  Genus: Pruvot-Fol, 1951
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Costasiella_sp_03.htm