Thalassocyon wareni is a species of sea snail, a marine gastropod mollusk in the family Thalassocyonidae.

[2] T. wareni gets its name from the man who documented the species for the first time, Anders Warén.

[3] The animal has two large salivitory glands, and long tapered radula.

[3] Males have an open pallial gonoduct, which presents as a groove in the animal's large penis.

[3] This species occurs in the Indian Ocean Abyssal Province and off the Saint Paul Island in the French Southern and Antarctic Lands.