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This species is as Thecacera sp. 4 in IPNat page 110.
Pretty similar is Thecacera pacifica which lacks the black spots on the body and does have a black line along the outside edge each gill, its extrabranchial processes, extrarhinophoral processes and the 'tail' are white tipped diffusing into blue then into a black band.
This species was posted on 25 April 2004 at these websites as Thecacera sp. A Genus: Fleming, 1828, I changed it on 25 April 2012 into
Thecacera sp. 01 Genus: Fleming, 1828.
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.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
More information on Thecacera sp. 01 as Thecacera sp. 2 are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 7 February 2018, Thecacera sp. 01 Genus: Fleming, 1828
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Thecacera_sp_01.htm