Drillia tristicha Dall, 1889 Compsodrillia tristicha, common name the saddened turrid, is a species of sea snail, a marine gastropod mollusc in the family Pseudomelatomidae, the turrids and allies.

The spiral sculpture consists of three principal strong threads, enlarged where they pass over the ribs, four more on the base of the body whorl, about eight somewhat weaker ones on the siphonal canal, and a single one in front of and marginating the suture.

The interspaces are wide, and upon them and over the fasciole are wound numerous fine, sharp, undulating, secondary spiral threads.

All these cross (on the penultimate whorl) fourteen even, rounded, narrow riblets, with narrower interspaces, which start at the anterior edge of the fasciole, cross the whorl, and fail on the siphonal canal.

[2] C. tristicha can be found in the Gulf of Mexico, ranging from the coast of Mississippi south to Brazil.