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Pretty similar are:
Chelidonura sp. 01 which lacks the broad white band on the head-shield and lacks the minute white dots on the parapodia,
Mariaglaja alexisi which lacks the broad white band on the head-shield and is densely covered with minute white spots (not only the outer surface of the parapodia).
Chelidonura sandrana which lacks the white band across head and has usually white and orange spots,.
This species was posted on 21 April 2003 at these websites as Chelidonura inornata Baba, 1949, Zamora-Silva & Malaquias (2017) moved it
into the new genus Mariaglaja Zamora-Silva & Malaquias, 2017.
Andrea Zamora-Silva and Manuel António E. Malaquias Molecular phylogeny of the Aglajidae head-shield sea slugs (Heterobranchia: Cephalaspidea): new evolutionary lineages revealed and proposal of a new classification
Zoological Journal of the Linnean Society, 2017, XX, 1-51 available online at https://academic.oup.com/zoolinnean/advance-article-abstract/doi/10.1093/zoolinnean/zlx064/4584517
More information on Mariaglaja inornata as Chelidonura inornata are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2017), published 31 December 2017, Mariaglaja inornata (Baba, 1949)
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Mariaglaja_inornata.htm