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Appalachian Slitmouth

(Pilsbry, 1900)

Stenotrema magnifumosum

Class:

Order:

Family:

Gastropoda

Stylommatophora

Polygyridae

ANSP 77630 [lectotype]

Ecological Information

Native/Inavsive:

Native

Nature Serve Conservation Status:

G4: Apparently Secure

Median Size:

5.5

Height:

Width:

7.7

Taper:

0.4

Taxonomic Information

Polygyra edvardsi var. magnifumosa

Original Combination:

Etymology

Original Description:

Shell small, dark brown and lustreless, often with some golden streaks or spots; the periphery angular in front; whorls 4 3/4 to 5 1/2 ; the upper surface distinctly wrinkle-striate, not hairy but when unworn showing short cuticular laminae (like those on P. spinosa); lower surface smooth, showing fine, slight spiral striae, and sometimes very short hairs or hair-scars. Aperture much as in P. stenotrema, the parietal lamella well developed, curving downwards at both ends, a callous ridge running from it to the peripheral insertion of the outer lip; notch of the basal lip median, of moderate size; no tooth developed on the callus within the outer lip. Alt. 4.7 to 5, diam. 7 to 7 1/2 mm.
Brannon's and Chestnut Flats, in Cade's Cove, Blount county, Tenn. (one specimen an albino) ; Welch Bald, on the Forney Ridge (one specimen), and Welch Bald branch of Chamber's creek (nineteen specimens); Chamber's creek (four), all in Swain county, N. C. Also south of the Little Tennessee river, in Graham County, N. C, on Tuskeegee creek (three specimens), and on the Cheoah river, near the confluence of Yellow creek (thirty-one specimens). "Bob's Bald " (three specimens). Clay county, N. C.; at Hayesville (forty-three specimens).
In all, 105 specimens from some eight localities, the extreme points about forty miles apart. Its vertical range is from about 4,500 feet on Welch Bald to a little below 2,000 feet at Hayesville, Chamber's creek, Cheoah river, etc.
Despite the varying localities, the specimens are remarkably uniform in character. The largest specimen was taken on Chamber's creek, measuring 5.7 mm. alt., 8.8 mm. diam.; otherwise typical. The peculiar sculpture of the upper surface, resembling that of P. spinosa, depUata, edvardsi, etc., and wholly unlike P. stenotrema or P. hirsuta, amply distinguish it from the latter species. Compared with P. edvardsi, described from West Virginia, the var, magnifumosa differs in the following features: the parietal lamina is higher, stronger and more sinuous, with a stronger callus between it and the upper end of the peristome; the lip notch is deeper and wider, and the periphery is less angular.
P. edvardsi was collected at Burnside, Pulaski county, Ky., by Messrs. Ferriss and Sargent, the specimens differing from the West Virginians in the well-developed lip notch.

Original Description Citation:

Pilsbry, H. A. (1900). Mollusca of the Great Smoky Mountains. Proceedings of the Academy of Natural Sciences of Philadelphia. 52: 110-150.

Citations

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Created by Chandler Olson

Last Updated: 04/18/2024

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