Cantharus septemcostatus is a species of sea snail, a marine gastropod mollusk in the family Pisaniidae, the true whelks.
Distribution This marine species occurs off New Caledonia.
References
Vermeij G.J. & Bouchet P. 1998. New Pisaniinae (Mollusca, Gastropoda, Buccinidae) from New Caledonia, with remarks on Cantharus and related genera. Zoosystema 20(3): 471-485