Distribution: Florida to Texas.
Size: Diameter 1.9 mm; altitude 0.9 mm. Description: Color translucent white in live or fresh material to opaque in dead specimens; shape trochoid, depressed, smooth; sculpture of faint axial growth lines and faint to obscure spiral threads; spire covered by thin, glazed callus; umbilical callus fills the entire umbilical depression in mature specimens; aperture oblique; parietal callus thick with a commissure at the upper inner angle; operculum multispiral and dark brown. Habitat: Inlet areas and surf zone. Shells found on Texas beaches from shoreline to a depth of 1 m (3 ft). Depth range 0 to 500 m (1640 ft). Remarks: T. biscaynensis is different from other Teinostoma species by having a spire that is glazed over. See Moore (1964); Ode (1970h, 1987c, 1988a).
Synonym: T. nesaeum Pilsbry and McGinty, 1945.