Cylindrical Vertigo - Vertigo binneyana
A small shell, about 1.1 mm diameter and 2.1 mm in height, subcylindrical (pupiform) and tapering, weak and irregular axial striae, about 5 whorls. Shell coloration is translucent reddish-brown and glossy. Aperture subovate, with six teeth (denticles: parietal, columellar, lower palatal, upper palatal, angular, infrapalatal), a moderate palatal callus, a weakly indented sinulus, a crest behind the lip. The original description was based on specimens collected about 1890 at Helena (Hendricks 2012, Burke 2013).
Combination of size (height < 3.0 mm) and shape, presence of teeth in a subovate aperture, 4-5 whorls, and an indentation in palatal lip distinguish Vertigo from similar appearing shells. Combination of weak or absent sinulus, moderately developed palatal callus, shell height < 2.2 mm (2.1 mm for this species), and aperture with 6 teeth differentiate this from the similar V. gouldii.
North America scattered across Alberta, Manitoba, New Mexico and Montana. In Montana, six records east of the Continental Divide from five counties: Dawson (1), Gallatin (1), Lewis and Clark (1), Wheatland (2), Wibaux (1). Elevation range is 640 to 1890 m (2100 to 6200 ft). Range and abundance in Montana are poorly defined, and no contemporary records exist; current status needs investigation. May be relatively common at some locations; 88 (7 live, 81 shells) were reported at the Wheatland County site (Hendricks 2012).
Observations in Montana Natural Heritage Program Database
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Moist sites with a canopy of plains cottonwood; found under woody debris, rocks, and in leaf litter. Alberta records are from sites with forest canopy including Engelmann spruce, lodgepole pine, Douglas-fir and aspen. Habitat in Montana poorly described (Hendricks 2012).
- Literature Cited AboveLegend: View Online Publication
- Burke, T. E. 2013. Land snails and slugs of the Pacific Northwest. Corvallis, OR: Oregon State University Press. 344 p.
- Hendricks, P. 2012. A Guide to the Land Snails and Slugs of Montana. A report to the U.S. Forest Service - Region 1. Montana Natural Heritage Program, Helena, MT. vii + 187 pp. plus appendices.
- Additional ReferencesLegend: View Online Publication
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- Berry, S.S. 1913. A list of Mollusca from the Mussellshell Valley, Montana. Nautilus 26:130-131.
- Berry, S.S. 1916. Notes of Mollusca of central Montana. Nautilus 29:124-128.
- Forsyth, R.G. 2004. Land snails of British Columbia. Royal British Columbia Museum: Victoria, British Columbia, Canada. 188 pp.
- Harris, S.A. 1978. Vertical zonation of land snails in the Iraqi slopes of the Persian Mountains and in the Rocky Mountains of Alberta, Canada. Arctic and Alpine Research 10:457-463.
- Henderson, J. 1924. Mollusca of Colorado, Utah, Montana, Idaho, and Wyoming. University of Colorado Studies 13(2):65-223.
- Pilsbry, H.A. 1948. Land Mollusca of North America (north of Mexico), Volume II Part 2. The Academy of Natural Sciences of Philadelphia Monograph Number 2(2): 521-1113.
- Squyer, H. 1894. List of shells from the vicinity of Mingusville, Montana. The Nautilus 8:63-65.
- Sterki, V. 1890a. On new forms of Vertigo. Proceedings of the Academy of Natural Sciences of Philadelphia 42:31-35.
- Sterki, V. 1890b. On Some Northern Pupidae, with Descriptions of New Species. The Nautilus 3:123-126.
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