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Coleoptera of Great Smoky Mountains National Park Species Pages

Family Eucnemidae

            Tribe Nematodini

 Nematodes penetrans (Say)

Description and Taxonomy

Length 3.2-8.1 mm. The genus and the tribe to which it belongs is monotypic in N. America and may be recognized by the strongly reduced or obliterated hypomeral antennal grooves, the presence of spine rows on lateral surfaces of the tibiae and the last visible ventrite produced to form a distinct apical abdominal spine (Muona 2000).  In the Nearctic Region, the genus is represented by four species, one of which is presumably extinct (not collected since the early XX century) and another restricted to southern Florida.  This species may be separated from the another common eastern species (N. atropos (Say)), yet to be found in GSMNP) by the feebly indicated hypomeral grooves and short antennae with 6th antennomere being shorter and narrower than the 7th,

Life History

This is one of the rarest eucnemid species in GSMNP. The single collected specimen was attracted to an ultraviolet light in mid June at 695 m elevation.  The life history  is poorly known, and reported host trees include Acer, Fagus, and Ulmus (Muona 2000).


Widespread, but uncommon eastern N. American species known from Michigan and Quebec to Texas and Louisiana (Muona 2000).

Conservation Concerns

Not under threat so far as known, but potentially of concern due to its rarity in collections and the possible extinction of a congeneric species.


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 17 August 2007, A. K. Tishechkin, Louisiana State Arthropod Museum.

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