Hexabranchus orbicularis Abraham, 1877

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 : 732

Hexabranchus orbicularis Abraham, 1877 (Fig. 26Q)

Description notes External features observed on a freshly preserved specimen: size 72 mm; body depressed, oval; mantle expanded around the body except anteriorly; numerous gill leaves grouped in eight tufts; gill leaves white, red lined; notum purple-red, mottled with white blotches; mantle lateral extension dark with radiating streaks of red, white blotches and a white edge; red rhinophores; gill branches white, lined in red; underside of mantle mottled; oral tentacles fleshy, oval with a crenate edge.

Own conclusion/opinion on its taxonomic status The color description was based on a recently preserved specimen and may not be totally accurate. Nevertheless, the red radiating streaks at the margin exclude the possibility of being H. giganteus sp. nov. The general coloration together with the number of gill leaves suggest that this species is likely a junior synonym of H. lacer (instead of H. sanguineus ).