Hexabranchus aureomarginatus Ostergaard (1955)

Tibiriçá, Yara, Pola, Marta, Pittman, Cory, Gosliner, Terrence M., Malaquias, Manuel A. & Cervera, Juan Lucas, 2023, A Spanish dancer? No! A troupe of dancers: a review of the family Hexabranchidae Bergh, 1891 (Gastropoda, Heterobranchia, Nudibranchia), Organisms Diversity & Evolution (New York, N. Y.) 23 (4), pp. 697-742 : 734-735

Hexabranchus aureomarginatus Ostergaard (1955) (Fig. 26X)

Description notes No details of the internal morphology provided: from 76 mm (holotype) up to 170 mm; body depressed; notum bright orange to orange with variable white marks.; four to six gill branches, relatively small; rhinophore sheath elevated, reddish, orange, and white; oral tentacles scalloped.

Own conclusion/opinion on its taxonomic status Color variation was noted mainly on the foot sole which ranged from yellowish to deep carmine, as well as in the overall color intensity. The yellow margin appears consistent in all variations. Our analysis confirms its close relationship to H. sanguineus and that it is a separate and valid species endemic to Hawaii.