Early Miocene; Extinct.
Southern Florida to northern Florida.
Original Description (from Cooke, 1919, p. 135):
"The following is a description of this species:
Shell equivalve, inequilateral, moderately convex; about 22 round ribs, separated by slightly narrower interspaces; surface of the ribs with curved imbricating spines, convex towards the umbones, and with very faint radiating striae; interspaces with sculpture of fine, close-set, concentric striae; near the ventral margin a small thread appears in each interspace; submargins depressed, ornamented with small radial threads and fine concentric striae; ears moderately large, subequal, with radial, nodose riblets.
Alt., 39 mm.; lat., 36 mm.; diam., 14 mm.
Locality. Roadside, descent to Crocus Bay, Anguilla, station 6893, also 6894 and 6965, Vaughan.
Geologic horizon. Oligocene.
Type. U. S. Nat. Mus. No. 167079."
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