Cavolinia tridentata atlantica, van der Spoel, 1974
Diagnostic description:
Moderately vaulted dorsal surface. Central rib on dorsal side is well developed. No keels along lateral sides. Caudal spine is short and straight. Ventral side is moderately vaulted. Aperture is triangular-lunar shaped. Dorsal aperture lip is rounded. Growth lines on shell are faint along with striations in transversal direction. [van der Spoel, 1976]