plicata = folded, refering to the folded appearance of the aperture
Shell convex beneath, depressed above, spire slightly elevated; whorls five, compressed, crossed by numerous raised equidistant lines, shich form grooves between them; sperture subreniform, labrum reflected, regularly arquated, describing two-thirds of a circle, within two-toothed, teeth not seperated by a remarkable sinus; labrum with a profound duplicature, which terminates in an acute angle at the centre of the aperture; beneath, exhibiting only two volutions, of which the external one is slightly grooved near the suture.
Breadth 1-4 of an inch.
Cabinet of the Academy.
This species is about the same size with P. avara, but, besides other characters, it is sufficiently distinguished by the acute fold of the labrum. It was sent to the Academy by Mr. Samuel Hazard.
Original Description Citation:
Say, T. (1821). Description of univalve shells of the United States. Journal of the Academy of Natural Sciences of Philadelphia. 2(1): 149-179.
Nature Serve Conservation Status:
G4: Apparently Secure