Plants and Animals

Cambarus robustus Big water 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: S2? - Imperiled (inexact or uncertain)


CountyNumber of OccurrencesYear Last Observed
Alcona 5 2015
Arenac 4 2015
Clare 2 1968
Crawford 1 2015
Eaton 1 1965
Gladwin 3 2015
Hillsdale 3 2015
Ionia 1 1967
Iosco 4 2015
Kalamazoo 1 1988
Kalkaska 1 2015
Kent 1 2014
Lapeer 3 2015
Lenawee 4 2015
Macomb 3 2015
Midland 1 2015
Montcalm 2 2015
Montmorency 2 1968
Oakland 5 2018
Ogemaw 2 2015
Oscoda 1 2015
Presque Isle 1 1968
Roscommon 2 2015
Sanilac 1 2015
Washtenaw 3 2015

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.