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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Carabidae

            Tribe Nebriini

 Nebria  (Reductonebria) pallipes  Say

Description and Taxonomy

Length 10-12mm. This medium sized Nebria is easily distinguished from  other Appalachian species of the genus by its color pattern and distinctive pronotum. The pronotum lacks lateral seta and has broadly reflexed, strongly curved sides, without (or only with suggestion of) a sinuation before the hind-angles, which are very obtuse (Lindroth 1961). In the Nearctic Region, the genus is represented by 53 species, but only three of them inhabit the Smokies (Ball and Bousquet 2001).

Life History

Most Nebria species are strongly hygrophilous and confined to stony margins of running water. In GSMNP adults prefer shaded areas with shelter from trees or bushes at lower and middle altitudes (400-800m) where they probably feed on emerging stoneflies, terrestrial riparian  and aquatic organisms occurring along the shoreline. Their feeding habits are probably similar to those of  European Nebria species (Hering and Plachter 1997). Larvae share the same habitats and food with adults. The species presumably overwinters as  larvae (Lindroth 1961), so adults appear during late May-early June. Specimens from GSMNP were collected during June - July. At Little Pigeon River the species was taken in company with another ground beetle, Agonum extensicolle.

Distribution

Widely distributed through northeastern North America as far south as Georgia  and South Carolina and north to Quebec and New Brunswick  (Bousquet and Larochelle 1993). At present it is known from scattered localities in GSMNP, but probably is distributed widely and inhabits most  low and middle-altitude streams inside GSMNP. At Little Pigeon River the species was taken in company with another ground beetle, Agonum extensicolle.

Conservation Concerns

Not under threat.

Habitat of  Nebria pallipes.

 

 

Locality records in GSMNP.

Acknowledgements

Development of these pages was supported by grants from Discover Life in America and the National Science Foundation (DEB-0516311). Photograph of habitat courtesy Yuliya Y. Sokolova, Louisiana State University.

References

Ball, G. E., and Y. Bousquet. 2001.  6. Carabidae  Latreille, 1810. In: American Beetles. Vol.1. CRC Press. 32-132 pp.

Bousquet, Y., and  A. Larochelle. 1993. Catalogue of the Geadephaga  (Col. Trachypachidae, Rhysodidae, Carabidae, incl. Cicindelini) of America north of Mexico. Entomological Society of Canada, Memoir No.167. 395 pp.

Lindroth, C. H. 1961. The ground-beetles (Carabidae, excl.Cicindelinae) of  Canada and Alaska. Part 2. Opuscula Entomologica. Supplementum No.20. 1-200pp.

Hering D., and  H. Plachter. 1997. Riparian ground beetles (Coeloptera, Carabidae) preying on aquatic invertebrates: A feeding strategy in alpine floodplains. Oecologia.  Vol.111. No 2: 261-270

Posted 14 Aug. 2006, I. M. Sokolov, Louisiana State Arthropod Museum.

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