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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Eucnemidae

            Tribe Macraulacini

Isarthrus rufipes (Melsheimer)

Description and Taxonomy

Length 4-6mm. The genus may be diagnosed by the following combination of characters: lateral antennal grooves well defined with the maximum width in the middle, pronotum wider than long, and simple claws.  In the Nearctic Region, the genus is represented by two species, both widespread in the east (Muona 2000) and found in GSMNP. This species may be separated from its congener by the shallow antennal grooves.

Life History

One of the most common eucnemid species in GSMNP. Specimens were collected by Malaise traps and unspecified hand collecting from early June to mid September at 540-980 m elevation.  Known to develop both in deciduous and coniferous trees, i.e. Abies and Fagus (Muona 2000).


Widespread, eastern North American species, but uncommon in collections, known from Michigan and Ontario to Oklahoma and Georgia (Muona 2000).

Conservation Concerns

Not under threat.


Locality records in GSMNP.


Development of these pages was supported by grants from Discover Life in America and the National Science Foundation (DEB-0516311). .


Muona, J. 2001.  A revision of North American Eucnemidae. Acta Zoologica Fennica 212: 1-106.


Posted 5 Feb. 2007, A. K. Tishechkin, Louisiana State Arthropod Museum.

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