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It is uniformly white with ridges between the round depressions that resemble sponge oscula.
This species is as Atagema sp. 2 in IPN at page 185, it was posted on 16 May 2004 at these websites as
Atagema sp. A Genus: Gray, 1850, and changed on 11 September 2011 into Atagema sp. 01 Genus: M.E. Gray, 1850.
For some genera 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.
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. (2017), published 5 February 2017, Atagema sp. 01 Genus: M.E. Gray, 1850
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Atagema_sp_01.htm