Pupilla muscorum
Widespread column

Key Characteristics

The widespread column is a small land snail with an elongated shell that is 3.4 - 4.0 mm long and 1.5 - 1.7 mm wide.

Status and Rank

  • State Status: SC
  • State Rank: S2
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Charlevoix11949
Mackinac42009
Shiawassee11947
Washtenaw11962
Distribution map for Pupilla muscorum

Updated 7/21/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

This species inhabits calcareous slopes and wetlands. It is thought to be tolerant of disturbed habitats such as roadsides, culverts, and even quarries. In Michigan, it has been documented only from a rocky woodland and roadside cedar swamp.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Management

This species may be more tolerant of disturbance than most rare snails. However, land-use activities that remove forest canopy cover and alter critical habitat requirements such as cool microclimate and moisture availability should be avoided at occupied sites. These include activities such as timber harvesting, residential development, and road building. The species also is sensitive to excessive trampling and ORV use.

Active Period

Active from first week of April to fourth week of September

Survey Methods

Surveys can be conducted anytime during the growing season, but are most successful in spring and fall following rain showers or when soil is moist, during high relative humidity and cooler temperatures. In addition to visual surveys, surveyors can collect samples of leaf litter, turf, and loose soil, dry in a low-temperature oven, and sift through, looking for shells.

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Nov 21, 2017]

References

Survey References

Technical References

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