Polygyra tridentata fraudulenta
fraudulenta = fraudulent; likely refering to its similarity to T.tridentata and T. fallax
In its typical development this variety is a compact shell of reddish-brown color (varying to white in some localities); the spire is low-convex, composed of six closely coiled whorls, the last being notably deflexed in front and stringly constricted behind the lip. The aperture is strongly constricted behind the lip. The apertire is strongly "dished" or basin-shaped; the outer lip bears a broad tongue-shaped inflected tooth, situated at the postion of the periphery of the shell. The middle of the basal lip bears a small squarish tubercle, shich is often laterally compressed. The pariental wall bears an elevated oblique blade which is typically almost straight and never much curved.
Original Description Citation:
Pilsbry, H. A. (1894). Critical list of mollusks collected in the Potomac Valley. Proceedings of the Academy of Natural Sciences of Philadelphia. 46: 11-31, plate 1.
Nature Serve Conservation Status:
G4: Apparently Secure