Hexabranchus pellucidulus Abraham, 1876

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 : 731

Hexabranchus pellucidulus Abraham, 1876 (Fig. 26N)

Description notes Described from a preserved specimen; external morphology and brief radula description: size 27 mm (preserved); subpustulate on the back; lateral mantle not very wide when compared to others; small bipinnate gill leaves relatively close to each other; anal papilla slightly raised; less gelatinous texture anterior to the rhinophores; oral tentacles fleshy, crenate; color transparent white, yellowish; radula broad and bilobed with numerous hamate teeth.

Own conclusion/opinion on its taxonomic status The author distinguished this species (together with H. lacer ) from H. gloriosus by the dorsal sub-pustules. He further differentiated it from H. lacer by the latter having a more fimbriate mantle edge and conical pustules. However, the specimen was preserved, and we noticed that this characteristic can be an artifact of preservation. Unfortunately, since the type locality is unknown, and the description does not provide sufficient detail to accurately identify the species, H. pellucidulus is here considered a nomen dubium.