| Allocrangonyx | |
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| Family: | Allocrangonyctidae Holsinger, 1989 [1] |
| Genus: | Allocrangonyx Schellenberg, 1936 [2] |
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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]
Allocrangonyx pellucidus
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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
- ^ "Allocrangonyctidae Holsinger, 1989". Integrated Taxonomic Information System.
- ^ a b c "Allocrangonyx Schellenberg, 1936". Integrated Taxonomic Information System.
- ^ a b John R. Holsinger (1971). "A new species of the subterranean amphipod genus Allocrangonyx (Gammaridae), with a redescription of the genus and remarks on its zoogeography". International Journal of Speleology. 3 (3/4): 317–331. doi:10.5038/1827-806x.3.3.11. Archived from the original on 2011-07-22. Retrieved 2010-04-14.
- ^ Inland Water Crustacean Specialist Group (1996). "Allocrangonyx hubrichti". IUCN Red List of Threatened Species. 1996: e.T873A13087606. doi:10.2305/IUCN.UK.1996.RLTS.T873A13087606.en.
- ^ Inland Water Crustacean Specialist Group (1996). "Allocrangonyx pellucidus". IUCN Red List of Threatened Species. 1996: e.T874A13087705. doi:10.2305/IUCN.UK.1996.RLTS.T874A13087705.en.
- ^ a b Julian J. Lewis (October 2002). "Conservation assessment for Hubricht's long-tailed amphipod (Allocrangonyx hubrichti)" (PDF). USDA Forest Service.
- ^ G. O. Graening; John R. Holsinger; Danté B. Fenolio; Elizabeth A. Bergey; Caryn C. Vaughn (2006). "Annotated checklist of the amphipod crustaceans of Oklahoma, with emphasis on groundwater habitats" (PDF). Proceedings of the Oklahoma Academy of Science. 86: 65–74.
- ^ a b Henry W. Robison; John R. Holsinger (2000). "First record of the subterranean amphipod crustacean Allocrangonyx hubrichti (Allocrangonyctidae) in Arkansas" (PDF). Journal of the Arkansas Academy of Science. 54: 153.