Bactrocythara cryera is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
The length of the shell attains 5 mm, its diameter 2.1 mm.
(Original description) The shell closely resembles Kurtzina crossata <small>(Dall, 1927)</small> but is thinner, more glassy, and averages smaller. It lacks any crowning at the suture and features a faint, pervasive spiral striation.
This marine species occurs in the Western Atlantic Ocean, mainly from Georgia to Florida, United States at depths between 538 m and 805 m