The Three-tooth Carditid
Barely reaching quarter-inch, the Three-tooth Carditid, Pleuromeris tridentata (Say, 1826), belongs to the group of relatively abundant but seldom collected small, local bivalves. This species belongs in the same family (the carditidae) as last week's featured shell, the Broad-ribbed Carditid. The shell is inflated, triangular, and relatively thick, with a characteristic sculpture of 15 to 18 strongly beaded radial ribs. (In bivalve shell terminology, radial applies to sculpt