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 neglectus
Faxonius neglectus
(Ringed crayfish)
Native Transplant
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Faxonius neglectus (Faxon, 1885)

Common name: Ringed crayfish

Synonyms and Other Names: Orconectes neglectus (Faxon, 1885). Faxonius neglectus 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

Size: females up to 5 in long

Native Range: Central plains and Ozark regions.

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Guam Saipan
Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

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 neglectus are found here.

StateYear of earliest observationYear of last observationTotal HUCs with observations†HUCs with observations†
Missouri199820103Eleven Point; Harry S. Truman Reservoir; Spring
Nebraska196119614Dismal; Middle Big Blue; Middle Republican; Upper Little Blue
New York199720023Hudson-Wappinger; Lower Hudson; Mid Atlantic Region
Oregon1976201611Applegate; Chetco; Coast Fork Willamette; Illinois; Lower Rogue; Middle Rogue; South Umpqua; Southern Oregon Coastal; Umpqua; Upper Klamath; Upper Rogue

Table last updated 10/9/2018

† Populations may not be currently present.

Means of Introduction: Pathway unknown.

Impact of Introduction: May be replacing native crayfish.

Remarks: Found in clear, rocky streams and rivers with significant current.  Can live 5 years; burrows into the gravel in daylight; breeding begins in October and eggs are laid in late spring.

References: (click for full references)

Crandall, K.A. and S. De Grave. 2017. An updated classification of the freshwater crayfishes (Decapoda: Astacidea) of the world, with a complete species list. Journal of Crustacean Biology 37(5):615-653. https://doi.org/10.1093/jcbiol/rux070.

Revision Date: 10/18/2004

Citation Information:
U.S. Geological Survey, 2019, Faxonius neglectus (Faxon, 1885): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2267, Revision Date: 10/18/2004, Access Date: 9/15/2019

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. [2019]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [9/15/2019].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted. For queries involving fish, please contact Matthew Neilson. For queries involving invertebrates, contact Amy Benson.