Back to Coleoptera Checklist

Back to Species Webpage List

Coleoptera of Great Smoky Mountains National Park Species Pages

Family Histeridae

            Tribe Paromalini

 Platylomalus aequalis (Say)

Description and Taxonomy

Length 3.0-3.5 mm. The genus belongs to the tribe Paromalini, which is characterized by more or less dorsoventrally flattened bodies, expanded tibiae, expanded pro-, but not meso- and metatibiae, presence of a narrow prosternal lobe with a "lock" for the protibial spur, short epistoma and long basal piece of the aedeagus (Kryzhanovskij & Reichardt 1976, Mazur 1993, Caterino & Vogler 2002). Among the genera of Paromalini, Platylomalus may be diagnosed by the extremely flattened body, the lack of dorsal and the presence of prosternal carinal striae. The genus has a single, widely distributed representative in N. America.

Life History

This species lives under the bark of a diverse array of dead deciduous trees (oaks, cottonwoods, sycamores, maples) (Bousquet & Laplante 2006). Specimens in the Park were collected "under bark of hardwoods" at 550-580 m elevation.


 Widespread in the eastern two-thirds of N. America, from British Columbia and Quebec to Kansas and Florida (Bousquet & Laplante 2006).

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).


Bousquet, Y. and S. Laplante. 2006.  Coleoptera Histeridae. The insects and arachnids of Canada. Part 24. NRC Research press, Ottawa. 485 pp.

Caterino, M. S. and A. P. Vogler. 2002. The phylogeny of the Histeroidea (Cleoptera: Staphyliniformia). Cladistics 18: 394-415.

Mazur, S. 1993. Notes on new and little known oriental Histeridae (Col.). Revue Suisse de Zoologie 100: 211-219.

Kryzhanovskij, O. L. and A. N. Reichardt. 1976. Histeroidea. fauna of the USSR. Vol. V (4). Nauka: Moscow - Leneingrad. 433 pp.


Posted 13 August 2007, A. K. Tishechkin, Louisiana State Arthropod Museum.

Back to Coleoptera Checklist

Back to Species Webpage List