Rivercliff Three-Tooth

(Pilsbry, 1904)

Triodopsis discoidea

Class:

Order:

Family:

Gastropoda

Stylommatophora

Polygyridae

Taxonomic Information

Polygyra tridentata discoidea

Original Combination:

discoidea = discoid

Etymology

Original Description:

The shell is larger than tridentata, more depressed, the spire usually nearly flat. Whorls 5 1/2 closely and sharply striate. Umbilicus more widely expanding at its opening, showing more of the preceding whorl. The aperture is more or less "dished," the pariental tooth directed towards the upper lip-tooth, which while varying somewhat in shape has a tendancy to be rather wide and flat-topped. The lower lip-tooth is more acute, both being strictly marginal.
Alt. 9 1/2. diam. 20 1/2 mm.
Alt. 8, diam. 19mm.
Alt. 8 1/2, diam. 18 1/2 mm.

Original Description Citation:

Pilsbry, H. A. (1904). A new subspecies of Polygyra tridentata. The Nautilus. 17(12): 142-143.

Ecological Information

Native/Inavsive:

Native

Nature Serve Conservation Status:

G3: Vulnerable

Diet

-

Citations

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