The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Faxonius sanbornii
Faxonius sanbornii
(Sanborn crayfish)
Native Transplant

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Faxonius sanbornii (Faxon, 1884)

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).

Taxonomy: available through www.itis.govITIS logo

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)

Native Range:
Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences: 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.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
WA200820081Lower Skagit

Table last updated 11/27/2021

† 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.


Author: Hosabettu, M.

Revision Date: 4/1/2020

Citation Information:
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: 11/27/2021

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.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2021]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [11/27/2021].

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