Plants and Animals

Orconectes immunis Calico crayfish

Key Characteristics

No information available.

Status and Rank

US Status: No Status/Not Listed
State Status: SC - Special Concern (rare or uncertain; not legally protected)
Global Rank: G5 - Secure
State Rank: S4 - Apparently secure


CountyNumber of OccurrencesYear Last Observed
Arenac 1 2015
Barry 1 1965
Bay 1 2015
Berrien 1 2015
Calhoun 1 2014
Clinton 3 2015
Eaton 3 1967
Huron 1 2015
Ingham 1 2016
Iron 1 2016
Kalkaska 1 2015
Kent 4 2014
Lenawee 3 2015
Macomb 2 2015
Menominee 1 2016
Monroe 9 2018
Montcalm 1 2015
Oakland 1 2015
Saginaw 4 2015
Sanilac 5 2015
Shiawassee 3 2015
St. Clair 1 2015
Tuscola 1 2015
Van Buren 2 2015
Wayne 1 1968

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.


No information available.

Natural Community Types

  • Unknown

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 Recommendations

No information available.

Survey Methods

No information available.