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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Eucnemidae

            Tribe Macraulacini

Isarthrus calceatus (Say)

Description and Taxonomy

Length 4.5-8mm. 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 deep antennal grooves.

Life History

One of the rarer eucnemid species in GSMNP. A few specimens were collected by Malaise traps at Cades Cove ATBI plot from  late March to early May at 540 m elevation.  Known to develop in a wide variety of tree species including conifers, i.e. Fagus, Pinus, Quercus and Ulmus (Muona 2000).


Widespread and relatively common eastern North American species, known from Michigan and Quebec to Texas 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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