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Allocrangonyx
Genus of crustaceans From Wikipedia, the free encyclopedia
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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]
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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]
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References
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