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Costasiella sp. 01  Genus: Pruvot-Fol, 1951

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Costasiella sp. 01 is as Costasiella sp. 1 in IPNat page 77,
let me quote:"This species can be recognized by the opaque white pigment on the head and rhinophores and the black oval area situated immediately behind the rhinophores."
This picture shows the distinctive eye spots of the genus Costasiella: relatively close together between the rhinophores.
This species was posted on 14 December 2010 at these websites as Costasiella sp. A  Genus: Pruvot-Fol, 1951, and changed on 20 July 2011
into Costasiella sp. 01  Genus: Pruvot-Fol, 1951.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
Reference:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2018), published 6 April 2018, Costasiella sp. 01  Genus: Pruvot-Fol, 1951
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Costasiella_sp_01