Fossarus (Gottoina) compacta Dall, 1889 Haplocochlias compactus is a species of sea snail, a marine gastropod mollusc in the family Skeneidae.

The outline of the spire is convex with hardly any rounding in of the whorls toward the suture, which is nevertheless distinct and finely channelled.

The spiral sculpture consists of fine, close, even, rounded threads, growing gradually smaller from the suture forward.

There are about 25 threads on the body whorl, but they vary in number and strength with the individual specimen.

[2] This species occurs in the Gulf of Mexico and in the Caribbean Sea; in the Atlantic Ocean off North Carolina, USA.