Geothelphusa dehaani
Geothelphusa dehaani
(a freshwater crab)
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Geothelphusa dehaani

Common name: a freshwater crab

Identification: Geothelpusa dahaani is actually a species complex comprised of 2-3 species.

Native Range: Japan.

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Nonindigenous Occurrences: Several small crabs (about 1 inch across the carapace) were found at a Hyatt Hotel along the shore of Lake Las Vegas, a freshwater, artificial lake in the Las Vegas area, on two separate occasions in 2000. The first sighting, around March, included about a dozen crabs. All those collected at that time were females. The second sighting, around June, was of 2 males and 2 females. No females with eggs were found.

Means of Introduction: Although it was intially speculated that their introduction was likely the result of an aquarium release, their release has been traced to a sushi bar (A. Cook, pers. comm.).

Status: No more crabs have been collected since the initial find.

Remarks: Photos

Although these were identified by Dr. Neil Cumberlidge, Northern Michigan University, Peter ng kee lin, a crab expert in Singapore, reports that G. dahaani is actually a species complex comprised of 2-3 species.

Author: Fuller, P.

Revision Date: 8/28/2006

Citation Information:
Fuller, P., 2018, Geothelphusa dehaani: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL,, Revision Date: 8/28/2006, Access Date: 2/25/2018

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.

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Page Contact Information: Pam Fuller - NAS Program (
Page Last Modified: Tuesday, January 30, 2018


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Citation information: U.S. Geological Survey. [2018]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/25/2018].

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