Common name: Sanborn crayfish
Synonyms and Other Names: Orconectes sanbornii (Faxon, 1884). Faxonius sanbornii underwent a reclassification in August 2017, changing the genus of non-cave dwelling Orconectes to Faxonius (Crandall and De Grave 2017).
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Identification: This crayfish is light brown with a dark brown patch anterior to its cervical grove. This species has a unique dark brown 'U-shaped' saddle marking on the top of its abdomen and orange-tipped chelae bordered by narrow black bands. (Taylor and Schuster 2004).
Size: the mean length is 24.15 mm (Loughman 2011)
Hydrologic Unit Codes (HUCs) Explained
Puerto Rico &
Interactive maps: Point Distribution Maps
This species has not been found introduced elsewhere in the world (Larson and Olden 2011).
Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Faxonius sanbornii are found here.
Table last updated 5/7/2021
† Populations may not be currently present.
Ecology: Slab boulders, leaf packs, and depositional environments are all habitats used by the species. They are mostly found under large gravel and rocks (Taylor and Schuster 2015). The life cycle of O. sanbornii mirrors that of O. obscurus. Orconectes sanbornii demonstrates the same gregarious behavior observed in O. obscurus (Loughman 2011).
Impact of Introduction: This species has not been found introduced elsewhere in the world (Larson and Olden 2011).
References: (click for full references)
Larson, E.R. and J.D. Olden. 2011. The state of crayfish in the Pacific Northwest. Fisheries, 36(2): 60-73.
Loughman, Z.J. 2011. Ecology, systematics, and conservation of West Virginia's crayfishes (Doctoral dissertation, Indiana State University).
Taylor, C.A. and G.A. Schuster. 2004. The crayfishes of Kentucky. Illinois Natural History Survey.
Revision Date: 4/1/2020
Hosabettu, M., 2021, Faxonius sanbornii (Faxon, 1884): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2811, Revision Date: 4/1/2020, Access Date: 5/7/2021
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.