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Emilie Bess and Kevin P. Johnson
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Containing group: Atropetae


The family Trogiidae includes 7 genera and about 50 species distributed worldwide.   Seven species from four genera are known from North America.  Most of the North American trogiids species have been collected in homes or stored food products.



General Characters

Discussion of Phylogenetic Relationships

The monophyly of family Trogiidae is supported by the form of the wings, which are greatly reduced and always veinless, sometimes absent.  Molecular analysis including genera Cerobasis, Lepinotus, and Trogium also supports the monophyly of the family (18S & Histone3 nDNA, 16S rDNA; Yoshizawa et al. 2006).


Lienhard, C. and C.N. Smithers. 2002. Psocoptera (Insecta) World Catalogue and Bibliography. Muséum d'Histoire Naturelle, Geneva, Switzerland.

Mockford, E.L. 1993. North American Psocoptera (Insecta). Gainesville, Florida: Sandhill Crane Press.

Smithers, C.N. 1996. Psocoptera. Pp. 1-80, 363-372 (Index) in Wells A. (ed.) Zoological Catalogue of Australia. Vol. 26. Psocoptera, Phthiraptera, Thysanoptera. Melbourne: CSIRO Publishing, Australia.

Smithers, C.N. 1972. The classification and phylogeny of the Psocoptera. Memoirs of the Australian Museum 14: 1–349.

Yoshizawa, K., C. Lienhard, and K.P. Johnson. 2006. Molecular systematics of the suborder Trogiomorpha (Insecta: Psocodea: ‘Psocoptera’). Zoological Journal of the Linnean Society 146: 287–299.

Title Illustrations
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Scientific Name Trogium pulsatorium
Location Baiting Hollow, Suffolk County, New York, USA
Comments The one on the left has been eating (I think eating) a pile of what looks like insect parts for the last 10 minutes. He has just chased off the intruder on the right.
Specimen Condition Live Specimen
Identified By Edward Mockford
Copyright © 2009
Scientific Name Cerobasis
Location San Pedro, Los Angeles County, California, USA
Size 1.84 mm
Source Photo#50137
Source Collection BugGuide.Net
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs License - Version 1.0.
Copyright © David Ellsworth
About This Page

Emilie Bess
Illinois Natural History Survey, Champaign, Illinois, USA

Kevin P. Johnson
Illinois Natural History Survey, Champaign, Illinois, USA

Correspondence regarding this page should be directed to Emilie Bess at and Kevin P. Johnson at

All Rights Reserved.

Citing this page:

Bess, Emilie and Kevin P. Johnson. 2009. Trogiidae. Version 18 March 2009 (under construction). http://tolweb.org/Trogiidae/14451/2009.03.18 in The Tree of Life Web Project, http://tolweb.org/

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