Pyrgocythara astricta, common name the tied mangelia, is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
This species is a nomen dubium.
The length of the shell attains .
(Original description) The shell is somewhat fusiformly ovate. The spire is rather short, and the sutures are deep. The shell is longitudinally ribbed, with numerous ribs rather close-set. The color of the shell is whitish, encircled with a narrow brown zone.
This species occurs off Florida, USA