Allocrangonyx

Allocrangonyx is a genus of troglobitic amphipod crustaceans from the South Central United States.[3] The two species are both listed as vulnerable on the IUCN Red List.[4][5] The animals are blind and unpigmented. During the male's development, the outer ramus of the third uropod differentiates into secondary segments and grows to a length greater than the animal's body length.[6]

Allocrangonyx pellucidus lives in springs adjacent to Turner Falls.

Allocrangonyx
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Superorder: Peracarida
Order: Amphipoda
Family: Allocrangonyctidae
Holsinger, 1989 [1]
Genus: Allocrangonyx
Schellenberg, 1936 [2]
Species
  • Allocrangonyx pellucidus (Mackin, 1935)
  • Allocrangonyx hubrichti Holsinger, 1971

Allocrangonyx pellucidus

A. pellucidus, the "Oklahoma cave amphipod",[2] is known from caves and springs in the Arbuckle Mountains of Johnston, Murray and Pontotoc counties, Oklahoma.[7] The largest males reach 21.75 mm (0.856 in) long, while females reach 18 mm (0.71 in).[3]

Allocrangonyx hubrichti

A. hubrichti, the "Central Missouri cave amphipod"[2] or "Hubricht's long-tailed amphipod",[6] was thought for many years to be endemic to the state of Missouri, but specimens were discovered in 1996, 283 km (176 mi) away, in a water well near Romance, White County, Arkansas.[8] While the well is drilled into Pennsylvanian age sandstone, all previous records have been from Ordovician limestones and dolomites.[8]

References

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