Chrome Ambersnail -
Quickella rehderi, Succinea oregonensis
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Shell is oblong-ovate (succineiform), to about 12 mm in length and 8 mm in width, surface with irregular low wrinkles, about 3 1/4 whorls. Shell coloration is glossy, deep chrome yellow, somewhat opaque and chalky. Aperture is oblique and broadly oval, about 3/5 the shell length. Head and tentacles brownish (Hendricks 2012, Burke 2013). Internal anatomy is described by Pilsbry (1948).
The Succineidae is a most difficult family, with no sure way of distinguishing genera, let alone species, from shell characteristics. In general,
Catinella have shorter shells with a rounder aperture and relatively higher spire. Succinea are larger-shelled with more ovate apertures and swelling around the genital opening behind the right tenticle. Oxyloma are similar in size to Succinea but are narrower (larger ratio of height to width), with longer, narrower, ovate apertures (Burke 2013). Specific determination requires the aid of an expert.
Native to western North America. from Washington to southern California, east to Montana. In Montana, reported on both sides of the Continental Divide from four counties: Carbon, Fergus, Ravalli, Wheatland. Elevation range is 1219 to 1829 m (4000 to 6000 ft). Range and abundance are poorly defined in Montana; current status needs investigation (Hendricks 2012).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Predicted Distribution in Montana
Predicted distribution model for Chrome Ambersnail
Records were spatially unique and had a locational uncertainty of ≤ 400 meters.
Hotter colors indicate areas that are predicted to have more suitable habitat for the species.
Black dots are positive data used to build the model.
Gray dots are locations where a survey capable of detecting the species has been performed.
Landownership, a shaded relief map, and county lines are included for reference.
Details of the modeling effort, a description of the environmental layers used, and a more thorough interpretation
of model outputs can be found in the report
Land Mollusk Surveys and Predicted Distribution Models on USFS Northern Region Lands: 2007
More model output for this species
Riparian areas, near rivers, streams, and springs. Canopy species include cottonwoods. Found under woody debris and leaf litter in moist places. Habitat poorly defined in Montana (Hendricks 2012).
Literature Cited Above
Legend: 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. 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. Additional References
Legend: View Online Publication Do you know of a citation we're missing? Beetle, D.E. 1989. Checklist of recent Mollusca of Wyoming, U.S.A. The Great Basin Naturalist 49(4):637-645. 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. Frest, T.J. and E.J. Johannes. 2001. An annotated checklist of Idaho land and freshwater mollusks. Journal of the Idaho Academy of Science 36(2):1-51. Russell, R.H. and R.B. Brunson. 1967. A check-list of molluscs of Glacier National Park, Montana. Sterkiana 26:1-5. Squyer, H. 1894. List of shells from the vicinity of Mingusville, Montana. The Nautilus 8:63-65. Vanatta, E.G. 1914. Montana shells. Proceedings of the Academy of Natural Sciences of Philadelphia 66:367-371. Additional Sources of Information Related to "Snails / Slugs"