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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Eucnemidae

            Tribe Melasini

 Isorhipis obliqua (Say)

Description and Taxonomy

Length 5-10mm. The genus may be diagnosed by the following combination of characters: lack of antennal grooves on hypomera, pectinate antennae in males, and slender tibiae.  In the Nearctic Region, the genus is represented by four species, three of them known in the east (Muona 2000). Two species are found in GSMNP. Both with bicolored, yellowish-brown and black elytra. Isoriphis ruficornis is distinguished by the poorly developed medial keel of the 7th tergite and median pronotal grove extending to anterior half.

Life History

Specimens from the GSMNP were collected using Malaise traps and by unspecified hand collecting. They were taken along Snakeden Ridge in early April to early June at 725-980 m elevation. The species is known to develop in various species of deciduous trees, i.e. Acer, Betula, Cornus, Fagus and Platanus, mainly in decaying soft wood (Knull 1947; Muona 2000).


Widespread, but relatively rare throughout eastern North America, south to Arkansas, Georgia and Texas, and north to Quebec (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.

Van Horn, R.W. 1909. Notes on some of the Eucnemidae of the western states (Coleoptera, Eucnemidae). Proceeding of the Entomologica Society of Washington 11: 54-62.


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

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