Allocrangonyx
{{Short description|Genus of crustaceans}}
{{Automatic taxobox
| image = Allocrangonyxpelucidus2.jpg
| parent_authority = Holsinger, 1989 {{ITIS |id=609985 |taxon=Allocrangonyctidae Holsinger, 1989 }}
| taxon = Allocrangonyx
| authority = Schellenberg, 1936 {{ITIS |id=95099 |taxon=Allocrangonyx Schellenberg, 1936 }}
| subdivision_ranks = Species
| subdivision = *{{nowrap|Allocrangonyx pellucidus (Mackin, 1935)}}
- Allocrangonyx hubrichti Holsinger, 1971
}}
File:Allocrangonyxpelluciduscropped.jpg
Allocrangonyx is a genus of troglobitic amphipod crustaceans from the South Central United States.{{cite journal |author=John R. Holsinger |year=1971 |title=A new species of the subterranean amphipod genus Allocrangonyx (Gammaridae), with a redescription of the genus and remarks on its zoogeography |journal=International Journal of Speleology |volume=3 |issue=3/4 |pages=317–331 |doi=10.5038/1827-806x.3.3.11 |doi-access=free |bibcode=1971IJSpe...3..317H }} The two species are both listed as vulnerable on the IUCN Red List.{{Cite iucn | author = Inland Water Crustacean Specialist Group | title = Allocrangonyx hubrichti | year = 1996 | page = e.T873A13087606 | doi = 10.2305/IUCN.UK.1996.RLTS.T873A13087606.en }}{{Cite iucn | author = Inland Water Crustacean Specialist Group | title = Allocrangonyx pellucidus | year = 1996 | page = e.T874A13087705 | doi = 10.2305/IUCN.UK.1996.RLTS.T874A13087705.en }} 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.
''Allocrangonyx pellucidus''
A. pellucidus, the "Oklahoma cave amphipod", is known from caves and springs in the Arbuckle Mountains of Johnston, Murray and Pontotoc counties, Oklahoma.{{cite journal |title=Annotated checklist of the amphipod crustaceans of Oklahoma, with emphasis on groundwater habitats |author1=G. O. Graening |author2=John R. Holsinger |author3=Danté B. Fenolio |author4=Elizabeth A. Bergey |author5=Caryn C. Vaughn |journal=Proceedings of the Oklahoma Academy of Science |volume=86 |pages=65–74 |year=2006 |url=http://www.anotheca.com/Oklahoma_amphipods.pdf }} The largest males reach {{convert|21.75|mm|abbr=on}} long, while females reach {{convert|18|mm|abbr=on}}.
''Allocrangonyx hubrichti''
A. hubrichti, the "Central Missouri cave amphipod" or "Hubricht's long-tailed amphipod",{{cite web |title=Conservation assessment for Hubricht's long-tailed amphipod (Allocrangonyx hubrichti) |author =Julian J. Lewis |publisher=USDA Forest Service |date=October 2002 |url=http://www.fs.fed.us/r9/wildlife/tes/ca-overview/docs/invertebrate_allocrangonyx_hubrichti-Hubrichts%20Amphipod.pdf }} was thought for many years to be endemic to the state of Missouri, but specimens were discovered in 1996, {{convert|283|km|abbr=on}} away, in a water well near Romance, White County, Arkansas.{{cite journal |author1=Henry W. Robison |author2=John R. Holsinger |title=First record of the subterranean amphipod crustacean Allocrangonyx hubrichti (Allocrangonyctidae) in Arkansas |journal=Journal of the Arkansas Academy of Science |volume=54 |year=2000 |pages=153 |url=http://libinfo.uark.edu/aas/issues/2000v54/v54a27.pdf }} While the well is drilled into Pennsylvanian age sandstone, all previous records have been from Ordovician limestones and dolomites.{{clear left}}
References
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{{Taxonbar|from=Q3933396|from2=Q4847990|from3=Q4851295}}
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Category:Crustaceans of the United States
Category:Freshwater crustaceans of North America