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Pretty similar are:
Sclerodoris sp. 06 Genus: Eliot, 1904 which has papillae on the ridges, and differs by the gills, and by the ridges,
Sclerodoris sp. 07 Genus: Eliot, 1904 which differs by excavations or 'pits' near the mantle margin.
More information on Halgerda dalanghita are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 5 July 2017, Halgerda dalanghita Fahey & Gosliner, 1999
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Halgerda_dalanghita.htm