''Cambarus cryptodytes'', the Dougherty Plain cave crayfish or Apalachicola cave crayfish, is a small, freshwater
crayfish
Crayfish are freshwater crustaceans belonging to the infraorder Astacidea, which also contains lobsters. Taxonomically, they are members of the superfamilies Astacoidea and Parastacoidea. They breathe through feather-like gills. Some spe ...
endemic
Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
to Florida and Georgia in the United States. It is an underground species known only from waters associated with the
Floridan aquifer
The Floridan aquifer system, composed of the Upper and Lower Floridan aquifers, is a sequence of Paleogene carbonate rock which spans an area of about in the southeastern United States. It underlies the entire state of Florida and parts of Alaba ...
.
Description
The Dougherty Plain cave crayfish grows to a length of about with
antennae twice this length. It is a colourless species with unpigmented eyes, segmented
cephalothorax
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. (The terms ''prosoma'' and ''opisthosoma'' are equivalent to ''cepha ...
and
abdomen
The abdomen (colloquially called the gut, belly, tummy, midriff, tucky, or stomach) is the front part of the torso between the thorax (chest) and pelvis in humans and in other vertebrates. The area occupied by the abdomen is called the abdominal ...
, a pair of slender
chelae
A chela ()also called a claw, nipper, or pinceris a pincer-shaped organ at the end of certain limbs of some arthropods. The name comes from Ancient Greek , through Neo-Latin '. The plural form is chelae. Legs bearing a chela are called chelipeds ...
(claws) with a row or two of
tubercle
In anatomy, a tubercle (literally 'small tuber', Latin for 'lump') is any round nodule, small eminence, or warty outgrowth found on external or internal organs of a plant or an animal.
In plants
A tubercle is generally a wart-like projectio ...
s and long slender
appendage
An appendage (or outgrowth) is an external body part or natural prolongation that protrudes from an organism's body such as an arm or a leg. Protrusions from single-celled bacteria and archaea are known as cell-surface appendages or surface app ...
s. The rostrum is long and unadorned with tubercles or spines.
Distribution
The Dougherty Plain cave crayfish is known from springs, wells and cave systems in the
karst
Karst () is a topography formed from the dissolution of soluble carbonate rocks such as limestone and Dolomite (rock), dolomite. It is characterized by features like poljes above and drainage systems with sinkholes and caves underground. Ther ...
limestone region of Dougherty Plain in the
Southeastern United States
The Southeastern United States, also known as the American Southeast or simply the Southeast, is a geographical List of regions in the United States, region of the United States located in the eastern portion of the Southern United States and t ...
. It has been found in
Dougherty County and
Decatur County Decatur County is the name of various past and present counties in the United States, all named for Stephen Decatur
Commodore (United States), Commodore Stephen Decatur Jr. (; January 5, 1779 – March 22, 1820) was a United States Navy of ...
in Georgia and
Jackson County and
Washington County in Florida. It is likely also to be present in other Georgia counties which lie between the two presently-known ranges.
[ A ]USGS
The United States Geological Survey (USGS), founded as the Geological Survey, is an government agency, agency of the United States Department of the Interior, U.S. Department of the Interior whose work spans the disciplines of biology, geograp ...
survey of the area, carried out between September 2014 and August 2015, revealed additional sites in Early
Early may refer to:
Places in the United States
* Early, Iowa, a city
* Early, Texas, a city
* Early Branch, a stream in Missouri
* Early County, Georgia
* Fort Early, Georgia, an early 19th century fort
Music
* Early B, stage name of Jamaican d ...
, Miller
A miller is a person who operates a mill, a machine to grind a grain (for example corn or wheat) to make flour. Milling is among the oldest of human occupations. "Miller", "Milne" and other variants are common surnames, as are their equivalents ...
, Mitchell, and Seminole
The Seminole are a Native American people who developed in Florida in the 18th century. Today, they live in Oklahoma and Florida, and comprise three federally recognized tribes: the Seminole Nation of Oklahoma, the Seminole Tribe of Florida, ...
counties.
Biology
Little is known of the biology of this crayfish. It is probably an opportunistic omnivorous
An omnivore () is an animal that regularly consumes significant quantities of both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize ...
scavenger and may feed on the Georgia blind salamander
The Georgia blind salamander (''Eurycea wallacei'') is a species of salamander in the family Plethodontidae (the "lungless salamanders"). It is endemic to the south-eastern United States where its natural habitats are inland karsts, caves and su ...
(''Eurycea wallacei'') which shares the same range.[ It has a low ]metabolic rate
Metabolism (, from ''metabolē'', "change") is the set of life-sustaining chemical reactions in organisms. The three main functions of metabolism are: the conversion of the energy in food to energy available to run cellular processes; the co ...
, perhaps associated with the limited availability of food, and consequently it is possible that it may live for twenty years or more. Males with ripe gonad
A gonad, sex gland, or reproductive gland is a Heterocrine gland, mixed gland and sex organ that produces the gametes and sex hormones of an organism. Female reproductive cells are egg cells, and male reproductive cells are sperm. The male gon ...
s have been found between July and October but females bearing eggs, juveniles or sub-adults have not been found in the wild.[ However, a full breeding cycle has been observed in captivity in the lab. This was the first breeding record for a ]troglomorphic
Troglomorphism is the morphological adaptation of an animal to living in the constant darkness of caves, characterised by features such as loss of pigment, reduced eyesight or blindness, and frequently with attenuated bodies or appendages. The ter ...
crayfish.
Status
In 1996 this species was listed as " Vulnerable" in the IUCN Red List of Threatened Species
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological spe ...
but following the discovery that its range is wider than originally thought, it was in 2010 recategorised as being of "Least concern
A least-concern species is a species that has been evaluated and categorized by the International Union for Conservation of Nature (IUCN) as not being a focus of wildlife conservation because the specific species is still plentiful in the wil ...
" on the grounds that it has a broad range and is common within that range. It seems to be able to live in water with low oxygen levels and may be widespread in the aquifer away from locations that open to the surface.
References
{{Taxonbar, from=Q4467676
cryptodytes
Cave crayfish
Endemic crustaceans of the United States
Freshwater crustaceans of North America
Crustaceans described in 1941
Taxa named by Horton H. Hobbs Jr.
Taxonomy articles created by Polbot