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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Eucnemidae

            Tribe Melasini

 Microrhagus triangularis LeConte

Description and Taxonomy

Length 2.5-4.0mm. In addition to tribal characters (prominent lateral pronotal ridges, notosternal antennal grooves, deep pits near procoxae) the genus may be diagnosed by 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 congerers by short anterior pronotal ridges at most weakly serrate (in both sexes) antennae and bicolored legs.

Life History

This is the least common species of the genus in GSMNP. Specimens were collected using Malaise traps at three localities. Specimens were found from early June to late August at 625-1370 m elevation.  It is considered one of the most common North American species, though only one host genus is known, i.e. Cornus ( Muona 2000).


Widespread and common in eastern North American species, known from Minnesota and Quebec to Louisiana and Florida (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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