Shell of the Week: The Alternate-ribbed Scallop
In my opinion, the Alternate-ribbed Scallop, Caribachlamys mildredae(F.M. Bayer, 1941), is one of the most elegant species in the diverse scallop family Pectinidae. The species reaches 40 mm (about 1.6 inches). The anterior auricle (“ear-like” expansion near shell beak) is larger than the posterior one. In addition, the left valve is more compressed than the right one, and the shell sculpture pattern is complex, with ribs on the surface of the left valve bearing distinctive scale-like projections. The color is variable, from whitish to orange-red, mottled with brown; right valve of lighter color. The species is restricted to the east coast of Florida and the Florida Keys.