Corbula caribaea (d’ Orbigny, 1842) (= C. swiftiana C.B Adams) – Caribbean Corbula or Swift’s Basket Shell.

The Cobula Caribaea shell species measures up to 1.5 cm, and is thick, sturdy, very convex, almost equilateral (beaks very slightly anterior to midline) and inequivalve. It is rounded anteriorly but varies considerably in shape posteriorly from being partially truncate to being drawn out into a fairly sharp point. Also, the beaks in some specimens may not be nearly so convex and overhanging the dorsal margin as in others. Its color is a dull white, cream, whitish-grey or grey color with a yellowish periostracum. Strong, smooth, distinct, irregular concentric ribs or ridges sculpture the surface. The interior of shell is dull and white or grey, depending on the external color. Ligament internal in chondrophore. The right valve bears two posterior radial ridges, but the second one is very close to the dorsal margin and may be difficult to see. The left valve has only a single ridge. The right valve bears a single projecting cardinal tooth which fits into a V-shape socket in the left valve in such a way that it looks as if part of the hinge line in the left valve has been cut away. The left valve has only a very small projecting cardinal tooth. The adductor muscle scars roughly equal in the size, the posterior one being on a slightly raised platform.