Olivaceous turris
Knefastia olivacea, common name the olivaceous turris, is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
The length of the shell varies between 45 mm and 60 mm.
This marine species was found from the Sea of Cortez, Western Mexico, to Ecuador. Fossils have been found in Quaternary strata at the coast of Oaxaca, Mexico; age range: 0.126 to 0.012 Ma; also in Pleistocene strata in Costa Rica
