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Chrome Ambersnail - Mediappendix rehderi
Other Names:  Quickella rehderi, Succinea oregonensis

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Native Species

Global Rank: G3
State Rank: SNR


Agency Status
USFWS:
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General Description
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).

Diagnostic Characteristics
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.

Species Range
Montana Range Range Descriptions

Native
 


Range Comments
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: 8

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
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).

References
  • 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.
    • 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 ReferencesLegend:   View Online Publication
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    • 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.
  • Web Search Engines for Articles on "Chrome Ambersnail"
  • Additional Sources of Information Related to "Snails / Slugs"
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Citation for data on this website:
Chrome Ambersnail — Mediappendix rehderi.  Montana Field Guide.  .  Retrieved on , from