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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.

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Common name: straightedge crayfish

Taxonomy: available through www.itis.gov

Native Range: Native to western drainages of the Tombigbee River from the Noxubee River in Mississippi and northward in the State into drainages of the Yalobusha, Skuna, Yocona, Tallahatchie, and Coldwater rivers (Payne, 1972).

Alaska	Hawaii	Puerto Rico & Virgin Islands	Guam Saipan

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

Ecology: The Straightedge Crayfish is found in freshwater, semi-permanent to permanent streams; tolerant to sluggish flow (Payne, 1972).

The breeding season occurs from March through September when females lay eggs in burrows from August to November. Egg hatching occurs from 18 to 31 days after they are laid. Up to and including the fourth instar may remain attached to the female; third and fourth instars are the first juveniles to enter open water. Juveniles are considered adults after 6-8 months, reaching carapace length range of 36.0-45.5 mm; adult carapace length reached 55.0 mm after 1 year. The adults remain in deeper water during the day, moving into shallow waters at night (Payne, 1972).

Means of Introduction: Unknown, but most likely a bait bucket release.

Status: Unknown in its invaded range.

Impact of Introduction: Unknown, but could have the potential to threaten native species of crayfish.

References: (click for full references)

Payne, J.F. 1972. The life history of Procambarus hayi. American Midland Naturalist 87(1):25—35.

Skelton, C.E. 2010. History, status, and conservation of Georgia crayfishes. Southeastern Naturalist 9(3):127—138.

Author: Benson, A.J.

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.