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This species is most possibly Halgerda sp. 3 in IPN page 183:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Let me quote the description:"The uniform white color and black lines along the ridges immediately distinguishes this species. It has a few black spots and lines on the gill branches and a single black line on the rhinophores." and: "size 25 mm, Distribution: Known only from New Caledonia."
The above picture was taken during a tech dive at a depth of 70 m near Malapascua Island at Monad Shoal seamount .
The photographer Klaus Stiefel writes: "This is the largest nudibranch I ever saw, almost the size of a football."
that is 27 cm, the size of this specimen is 10 times the size of IPN Halgerda sp. 3, which also differs by orange pigment at the gill pocket.
How to cite:
Köhler, E. (2017), published 23 July 2017, Halgerda sp. 02 Genus: Bergh, 1880
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Halgerda_sp_02.htm