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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Eucnemidae

            Tribe Melasini

 Microrhagus audax Horn

Description and Taxonomy

Length 2.5-4.2mm. In addition to tribal characters (prominent lateral pronotal ridges, notosternal antennal grooves, deep pits near procoxae) the genus may be diagnosed by the simple elytral apices, long 3rd antennomere, narrowly separated antennal sockets and narrowing metacoxal plates.  In the Nearctic Region, the genus is represented by four species, all of them known in the east (Muona 2000) and in GSMNP. This species may be distinguished from its congeners by short anterior and posterior pronotal ridges, serrate antennomeres and yellowish legs and antennae.

Life History

Specimens from GSMNP were collected using Malaise traps, at lights and by unspecified hand collecting. The species is widespread in the Park, but is uncommon. Specimens were found from late May to mid August at 585-980 m elevation.  The species' life history is essentially unknown (Muona 2000).


Widespread but uncommon eucnemid known from New York and Illinois to Texas and Georgia, more regularly collected in the South  (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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