Seguenzia megaloconcha Rokop, 1972 · Seguenzia cervola is a species of extremely small deep-water sea snail, a marine gastropod mollusk in the family Seguenziidae.

They are separated by a somewhat convex smooth fasciole from a thread-like keel above the periphery.

At the aperture, is a shallow sulcus between the keel and the suture and a smaller one at the middle of the base.

There is a sharp notch below the end of the thin, arcuate projecting columella, behind which is a moderately large twisted umbilicus.

[3] The type specimen of this marine species was found off the Coronado Islands, Baja California.