Vertigo nylanderi
Deep-throat vertigo

Key Characteristics

The deep-throat vertigo is a small land snail with a cinnamon-colored cylindrical (beehive-shaped) shell that is 1.7 mm in height and 1 mm in width with 4.5 to 5 whorls. The growth lines on the shell are prominent. The aperture (main opening) has 6 strongly angular teeth or lamellae (calcareous plates, scales, or ridges on the inside of the aperture). The two lower palatal lamellae or teeth (on the outer lip or terminal part of the body whorl) are deeply inserted within the aperture. The two columellar lamellae or teeth located on the inside of the aperture on the main shell axis consist of a substantially larger lamella or tooth on top of a much smaller subcolumellar lamella. The two parietal lamellae or teeth on the inside or bottom of the main shell along the top of the aperture or opening also consist of a well-developed, larger parietal lamella or tooth adjacent to a thin, angular lamella.

Status and Rank

  • State Status: E
  • State Rank: S1?
  • Global Rank: G3G4

Occurrences

County NameNumber of OccurrencesYear Last Observed
Chippewa21998
Delta11998
Emmet1
Mackinac32009
Distribution map for Vertigo nylanderi

Updated 1/31/2017. 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

The deep-throat vertigo occurs in calcareous fens with an open tamarack overstory, smaller shrubs of speckled alder and a groundlayer of sedges. The species is not found in densely forested tamarack swamps, cedar-dominated wetlands, or wetlands with Sphagnum moss. The species also is limited to areas of shallow limestone bedrock.

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.

Feel free to send questions and comments to Brad Slaughter at slaugh14@msu.edu.

Management

The deep-throat vertigo is vulnerable to foot and vehicle (ORV) traffic and road construction. Hydrological changes strictly avoided. Use of prescribed fire in occupied sites should be avoided, if possible, or prescribed fire should be applied very conservatively, leaving multiple refugia and using a burn interval of at least 15 years.

Active Period

Active from first week of June 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 the soil is moist, and during higher relative humidity conditions and cooler temperatures. Visual surveys consist of looking for individuals crawling on the ground, in moist leaf litter, and on or under woody debris. Litter sampling consists of collecting soil and leaf litter samples in the field and drying, sifting and looking for snail shells in the litter samples in the laboratory.

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Apr 28, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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