Work found, with species-group names introduced therein:
Dupont, L. 1979. Note on variation in Diacria Gray, 1847, with descriptions of a species new to science, Diacria rampali nov. spec., and a forma new to science, Diacria trispinosa forma atlantica nov. forma. Malacologia 18 37-52. [Stated date: -- --- 1979; true date: pre 18 May.] Diacria trispinosa f. atlantica, see Diacria trispinosa (Blainville, 1821) Diacria rampali