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Montana Field Guide

Montana Field Guides

Santa Rita Ambersnail - Succinea grosvenori
Other Names:  Succinea lineata, Succinea mooresiana

Native Species

Global Rank: G5
State Rank: SNR

Agency Status

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General Description
Shell is oblong-ovate (succineiform), to about 15 mm in length and 9 mm diameter, thin, surface with numerous fine striae, about 3 1/2 to 4 whorls with a short spire. Shell coloration is translucent to opaque pale yellowish to whitish. Aperture is oblique and ovate, somewhat inflated, about 3/5 the shell length (Hendricks 2012). 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 Comments
Eastern North America west to the Rocky Mountains, including Utah and Arizona. In Montana, reported east of the Continental Divide from two counties: Roosevelt, Wibaux. Elevation range is 610 to 823 m (2000 to 2700 ft). Range and abundance in Montana poorly defined; current status needs investigation (Hendricks 2012).

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

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



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

Prairie riparian wetlands, near rivers, streams, seeps, sometimes drier habitat with sparse vegetation but where ground remains damp. Habitat in Montana poorly documented (Hendricks 2012).

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Citation for data on this website:
Santa Rita Ambersnail — Succinea grosvenori.  Montana Field Guide.  .  Retrieved on , from