Palaemonetes cummingi is a species of cave-dwelling

Troglobite

Troglobites are small cave-dwelling animals that have adapted to their dark surroundings. Troglobite species include spiders, insects, fish and others. They live permanently underground and cannot survive outside the cave environment. Troglobite adaptations and characteristics include a heightened...

 shrimp

Shrimp

Shrimp are swimming, decapod crustaceans classified in the infraorder Caridea, found widely around the world in both fresh and salt water. Adult shrimp are filter feeding benthic animals living close to the bottom. They can live in schools and can swim rapidly backwards. Shrimp are an important...

 in the family Palaemonidae

Palaemonidae

Palaemonidae is a family of crustaceans of the order Decapoda. They belong to the infraorder Caridea, which contains the true shrimp; while some freshwater palaemonid species are known as "prawns", the family belongs to the suborder Pleocyemata like all true shrimp, whereas the true prawns are...

, known as the Florida cave shrimp or Squirrel Chimney cave shrimp.

Description

Palaemonetes cummingi is typically 30 mm (1.2 in) long, and almost colorless. It has a long, serrated rostrum

Rostrum (anatomy)

The term rostrum is used for a number of unrelated structures in different groups of animals:*In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes....

, and no eye pigment.

Distribution and ecology

Palaemonetes cummingi is endemic to a single flooded solutional cave in Alachua County

Alachua County, Florida

Alachua County is a county located in the U.S. state of Florida. The U.S. Census Bureau 2006 estimate for the county is 227,120. Its county seat is Gainesville, Florida. Alachua County is the home of the University of Florida and is also known for its diverse culture, local music, and artisans...

, Florida

Florida

Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

. The closely related species P. paludosus

Palaemonetes paludosus

Palaemonetes paludosus, the eastern grass shrimp, is a species of freshwater shrimp from the Eastern United States.-Description:Palaemonetes paludosus is up to long and largely transparent. By manipulating the pigment granules in its body, it can produce effective camouflage against its...

, is larger (up to 48 mm or 1.9 in) and has second pereiopods noticeably longer than the first.

Conservation

Palaemonetes cummingi is the only cave shrimp to live in Florida. It has only ever been found at a single site, and has not been seen there since 1973. It is listed as a vulnerable species

Vulnerable species

On 30 January 2010, the IUCN Red List of Threatened Species identified 9694 Vulnerable species, subspecies and varieties, stocks and sub-populations.-References:...

 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...

,, a threatened species

Threatened species

Threatened species are any speciesg animals, plants, fungi, etc.) which are vulnerable to endangerment in the near future.The World Conservation Union is the foremost authority on threatened species, and treats threatened species not as a single category, but as a group of three categories,...

 under the Endangered Species Act

Endangered Species Act

The Endangered Species Act of 1973 is one of the dozens of United States environmental laws passed in the 1970s. Signed into law by President Richard Nixon on December 28, 1973, it was designed to protect critically imperiled species from extinction as a "consequence of economic growth and...

, and critically imperilled by NatureServe

NatureServe

NatureServe is a non-profit conservation organization whose mission is to provide the scientific basis for effective conservation action. NatureServe and its network of natural heritage programs are the leading source for information about rare and endangered species and threatened ecosystems in...

. Other caves may exist in the area with undiscovered populations, but urban development around Gainesville, Florida

Gainesville, Florida

Gainesville is the largest city in, and the county seat of, Alachua County, Florida, United States as well as the principal city of the Gainesville, Florida Metropolitan Statistical Area . The preliminary 2010 Census population count for Gainesville is 124,354. Gainesville is home to the sixth...

, and the introduction to the caves of the redeye chub, Notropis harperi, both threaten its survival, and the species may already be extinct.