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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Carabidae

            Tribe Bembidiini

 Bembidion (Furcacampa) affine  Say

Description and Taxonomy

Length 2.9-3.5mm. This small, yellow-marked Bembidion has frontal furrows that are doubled at both ends, on the clypeus and between the two supraorbital punctures, but simple in the middle. Superficially, it can be easily confused with some Bembidion species having similar color patterns, but can be distinguished by the presence of obvious microsculpture on the head, a strongly constricted pronotum basally, and the absence of short lateral sinuations beyond the hind angles of the pronotum (Lindroth 1963). More then 10 species of Bembidion inhabit GSMNP, and about 250 species of  the genus are currently recorded for Nearctic North America (Ball and Bousquet 2001).

Life History

The species is hygrophilous but otherwise is not particular about its choice of  soil or nearby water sources. In GSMNP adults can be found in a diversity of wet habitats. Probably, the distribution of the species reflects its temperature preferences. The beetle is quite common in wet habitats at low altitudes (400-700m), but higher up it becomes rare and avoids cool streams. At high altitudes (from 1500m up) the species is confined to moist habitats with sparse vegetation in open areas or areas with scattered, small trees.  Specimens from GSMNP were collected during May-August, with a few taken at January-February. So, the species overwinters as adults. Adults come to lights and are frequent in flight intercept trap samples. At  Little Pigeon River the species was taken in company with Bembidion impotens.

Distribution

Distributed through eastern North America from Florida and Texas to southern Quebec (Bousquet and Larochelle 1993). The species is known from many localities in GSMNP.

Conservation Concerns

Not under threat.

Habitat of  Bembidion affine.

 

 

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 Olexandre Rusin, 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. 1963. The ground-beetles (Carabidae, excl.Cicindelinae) of  Canada and Alaska. Part 3. Opuscula Entomologica. Supplementum No.24. 201-408pp.

Posted 17 Aug. 2006, I. M. Sokolov, Louisiana State Arthropod Museum.

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