Oxytropa Glibert, 1955 Polystira is a genus of sea snails, marine gastropod mollusks in the family Turridae, the turrids.

[1] Paul Bartsch (1934) states the genus Polystira was created by W. P. Woodring in 1928 for certain large West Indian turrids.

He named the largest of the recent species, generally known as Pleurotoma albida Perry, as type.

Perry's figure 4, plate 32, of this species does not agree with the West Indian material.

Wood, in 1818, in his " Index Testaceologicus ", on page 125, names this species Murex virgo, referring to Lamarck's figure cited above.