Orconectes alabamensis, the Alabama crayfish, is a species of freshwater crayfish

Crayfish

Crayfish, crawfish, or crawdads – members of the superfamilies Astacoidea and Parastacoidea – are freshwater crustaceans resembling small lobsters, to which they are related...

 that lives in Alabama

Alabama

Alabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...

, Mississippi

Mississippi

Mississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...

 and Tennessee

Tennessee

Tennessee is a U.S. state located in the Southeastern United States. It has a population of 6,346,105, making it the nation's 17th-largest state by population, and covers , making it the 36th-largest by total land area...

.

Description

The largest individuals of Orconectes alabamensis reach a carapace

Carapace

A carapace is a dorsal section of the exoskeleton or shell in a number of animal groups, including arthropods such as crustaceans and arachnids, as well as vertebrates such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron.-Crustaceans:In crustaceans, the...

 length of 35 millimetres (1.4 in), while the smallest adults have a carapace length of only 14.6 mm (0.574803149606299 in).

Distribution

Orconectes alabamensis is endemic to the Tennessee River

Tennessee River

The Tennessee River is the largest tributary of the Ohio River. It is approximately 652 miles long and is located in the southeastern United States in the Tennessee Valley. The river was once popularly known as the Cherokee River, among other names...

 drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

, with a range

Range (biology)

In biology, the range or distribution of a species is the geographical area within which that species can be found. Within that range, dispersion is variation in local density.The term is often qualified:...

 extending from Shoal Creek

Shoal Creek (Tennessee River)

Shoal Creek is a stream that arises in Lawrence County, Tennessee, and enters the Tennessee River in Lauderdale County, Alabama, where its lower reaches are impounded in the backwater of Wilson Dam.Its mouth is at approximately .'...

 (Lawrence County and Hardin County

Hardin County, Tennessee

Hardin County is a county located in the U.S. State of Tennessee. As of 2010, the population was 26,026. The Hardin County seat is Savannah. The county was named posthumously for Col. Joseph Hardin, a Revolutionary War soldier and a legislative representative for the Province of North Carolina and...

, Tennessee

Tennessee

Tennessee is a U.S. state located in the Southeastern United States. It has a population of 6,346,105, making it the nation's 17th-largest state by population, and covers , making it the 36th-largest by total land area...

) to Lauderdale County, Alabama

Lauderdale County, Alabama

-2010:Whereas according to the 2010 U.S. Census Bureau:*86.4% White*10.0% Black*0.4% Native American*0.7% Asian*0.0% Native Hawaiian or Pacific Islander*1.4% Two or more races*2.2% Hispanic or Latino -2000:...

.

Status

Orconetes alabamensis is listed as a species of Least Concern

Least Concern

Least Concern is an IUCN category assigned to extant taxon or lower taxa which have been evaluated but do not qualify for any other category. As such they do not qualify as threatened, Near Threatened, or Conservation Dependent...

 on the IUCN Red List

IUCN Red List

The IUCN Red List of Threatened Species , founded in 1963, is the world's most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the world's main authority on the conservation status of species...

. Under the NatureServe system used by The Nature Conservancy

The Nature Conservancy

The Nature Conservancy is a US charitable environmental organization that works to preserve the plants, animals, and natural communities that represent the diversity of life on Earth by protecting the lands and waters they need to survive....

, O. alabamensis is classified as G5: "secure".