Hexabranchus faustus, Bergh, 1878

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 : 733

Hexabranchus faustus var. Bergh (1878)

Description notes Description based on the preserved specimen; external and internal morphology provided; illustrations of jaw and radula details only: size 45 mm (preserved); shape oval, slightly wider posteriorly; mantle fairly broad; oral tentacles thick, with a wavy edge; rhinophores with 40–45 lamellae; six gill tufts; color bright yellow on sides and foot (preserved); radula typical with 22 hamate tooth rows; reproductive system not developed.

Own conclusion/opinion on its taxonomic status This variation was described from a single individual collected by Semper, it differs from H. faustus , above, only in minor details such as a broader mantle and a different radular formula. These differences are not sufficient to separate the species.