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Cherrystone Drop (Hendersonia occulta)


Overview

Overview

Cherrystone Drop (Hendersonia occulta) State Threatened, these terrestrial snails have a thick 6-8mm wide shell that is wider than it is high, usually reddish or yellowish in color, and lacks an opening in the center of the base of the shell. Inhabitants of small areas of algific habitat or the similar cool, moist, shaded sites of cliffs where algific conditions occur without substantial talus or ice. The species is most often found on wooded alluvial-soil banks and bluffs.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - both state and federal - and the rank (S and G Ranks) for Cherrystone Drop (Hendersonia occulta). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where occurrences of this species meet NHI data standards and is not meant as a comprehensive map of all observations.

Note: Species recently added to the NHI Working List may temporarily have blank occurrence maps.


Documented locations of Hendersonia occulta in the Natural Heritage Inventory Database as of July 2015.
Summary Information
State StatusTHR
Federal Status in Wisconsinnone
State RankS2S3
Global RankG4
Tracked by NHIY
WWAP SGCN

Species guidance


Note: a species guidance document is not available at this time. Information below was compiled from publication PUB-ER-085-99 (now out-of-print).

Identification: The shell is thick, wider than high, reddish or yellowish in color, marked by fine spiral lines across the surface of the whorls, and about 0.25 inches (5-8 mm) in diameter. The domed shaped spire (top part of shell above the aperture) has 6 whorls with the sutures (seams between the whorls) unimpressed. The base is rounded and without an opening, the umbilical area covered by a callous pad. In adults, the outer lip is greatly thickened forming a heavy projecting ridge.

Habitat: Inhabitants of small areas of algific habitat or the similar cool, moist, shaded sites of cliffs where algific conditions occur without substantial talus or ice. The species is most often found on wooded alluvial-soil banks and bluffs along the Lake Michigan shore. Driftless Area sites are on north-facing slopes supporting oak-maple woodland. This snail is found in the soil and leaf litter along cliffs, soil-covered ledges on cliff faces, and on talus and soil and leaf litter near the cliff base.

State Distribution: Occurs in Brown, Door, Kewaunee, Manitowoc, Sheboygan, Ozaukee, Milwaukee, Sauk, Crawford, Iron, Vernon and Grant Counties of Wisconsin.

Management Guidelines: The location of the snails in soil and leaf litter at the base of the cliffs makes them vulnerable to trampling. Preservation of habitat along the Lake Michigan shoreline will be a decisive factor in the long-term status of the snails in Wisconsin.

Photos/Video

Photos


Cherrystone Drop

Live Hendersonia occulta at site 162-Coon Creek

Photo © James Theler.

Cherrystone Drop

Chicago Field Museum Specimen. Marks are mm.

Photo by Terrell Hyde and W.A. Smith, WDNR.

Cherrystone Drop

Photo by Ryan O'Connor, WDNR.

Cherrystone Drop

Photo © James Theler.


Last revised: Thursday, May 04, 2017