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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Histeridae

            Tribe Histerini

 Margarinotus (Paralister) cognatus (LeConte)

Description and Taxonomy

Length 4.5-5.8 mm. The genus belongs to the tribe Histerini, which is characterized by the presence of an expanded prosternal lobe, free labrum, antennal cavities situated under the anterior angles of pronotum, dentate protibiae with straight protarsal furrow, antennal club with annuli not V-shaped, mesosternum without median projection and prosternal base without emargination (Kryzhanovskij & Reichardt 1976, Kovarik & Caterino 2000).  Five or six genera of Histerini are known in N. America (Kovarik & Caterino 2000, Bousquet & Lapalante 2006), and three are present in GSMNP. Margarinotus is an externally diverse genus diagnosed primarily by several characters of the male genitalia.  However, most species (all in the East and GSMNP) may be recognized by the emarginate outline of the anterior margin of the mesosternum and complete inner subhumeral striae on elytra. Twenty-nine described species in the genus are known in N. America, seven of which are found in the GSMNP. This species may be diagnosed by the posteriorly abbreviated marginal stria of the pronotum, the presence of  punctures inward of the inner lateral pronotal striae, variably long, often connected 5th dorsal and sutural striae (5th dorsal stria at least with basal fragment).

Life History

 The species' life history is unknown (Bousquet & Lapalante 2006). It is presumably attracted to decomposing fleshy fungi as the closely related M. lecontei is. It was collected in GSMNP once at 1610 m elevation.

Distribution

 Widespread in eastern N America  from Ontario and Nova Scotia to Texas and South Carolina (Bousquet & Lapalante 2006).

Conservation Concerns

Not under threat.

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).

References

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

Kovarik, P.W. and M. S. Caterino.  2000. Histeridae. Pp. 212-227 in: Arnett, R. H. and M. C. Thomas (eds.) American beetles. Vol. 1. CRC Press, Boca Raton  - London - New York - Washington.

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.

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