Trachypachidae

Trachypachidae
File:Trachypachus zetterstedtii.jpg
Trachypachus zetterstedtii
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Adephaga
Family:	Trachypachidae C. G. Thomson, 1857
Genera
Systolosoma Trachypachus

The Trachypachidae (or sometimes false ground beetles) are a family of beetles that generally resemble small ground beetles, but that are distinguished by the large coxae of their rearmost legs. Only six species are known in the family, with four species of Trachypachus found in northern Eurasia and northern North America, and two species of Systolosoma in Chile.

Their habits are similar to those of the ground beetles; they are usually found in the leaf litter of conifer forests.

To quote G. E. Ball, "the most interesting thing about this small family is its uncertain phylogenetic relationships"; it has been classified as a subfamily of Carabidae, and as a family been placed in several different positions relative to other beetle families.

Species

• Genus Systolosoma
  • Systolosoma breve
  • Systolosoma lateritium

• Genus Trachypachus
  • Trachypachus holmbergi
  • Trachypachus gibbsii
  • Trachypachus zetterstedi
  • Trachypachus slevini

References

• George E. Ball, "Trachypachidae", in Ross H. Arnett, Jr. and Michael C. Thomas, American Beetles (CRC Press, 2001), vol. 1