Boreomysis urospina is a species of mysid crustacean from the subfamily Boreomysinae (family Mysidae).

[1][2] The first 23 specimens of B. urospina were collected off Tasmania in the Huon Commonwealth Marine Reserve at the depth of 1046–1070 m in 2015 during the research cruise of RV Investigator.

Compared to other members of the genus Boreomysis B. urospina possesses a minute concavity on the lateral sides of the carapace anterior margin, and the proximal segment of the uropodal exopod is nearly half as long as the ramus.

In addition to the unique features B. urospina differs from it also by the longer antennal scales, which are more than twice as long as the antennular peduncle and about five times as long as wide, unmodified pleopod 2 of male and the larger number of the telson terminal spiniform setae (four).

The eyes are extremely large, with the cornea dominating over the stalk, lacking papilla.