Range. The species is known from the Early Miocene (Cercado Formation) to the Late Pliocene (Gurabo Formation) along the Gurabo River in the Dominican republic (Landau & Vermeij, 2012: 125).
Remarks. Landau & Vermeij (2012: 123, 124) correctly remarked that the spiral sculpture consisting of primary and secondary (and tertiary) cords may be more typical to Engina in a broad sence than to Clivipollia. The protoconch, however, is similar to Clivipollia. The apertural denticulation is more similar to Clivipollia as defined in the present paper and differs from Engina in having a narrow columellar and parietal callus, a weak or absent parietal denticle, a weak anal elevation or knob that is separated from the denticles inside the outer lip by a broad gap, a rather long siphonal canal, the fine and sharp primary spiral cords and a slightly larger adult size. Assigning Engina gigas to Clivipollia has important biogeographical implications because it becomes the first, and until now the only, known Clivipollia species in the Atlantic Ocean.