Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Gnatocerus maxillosus - Slender-horned Flour Beetle

Gnatocerus maxillosus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Tenebrionoidea (Fungus, Bark, Darkling and Blister Beetles)
Family Tenebrionidae (Darkling Beetles)
Subfamily Diaperinae
Tribe Diaperini
Subtribe Adelinina
Genus Gnatocerus
Species maxillosus (Slender-horned Flour Beetle)
Explanation of Names
Gnathocerus maxillosus (Fabricius 1810)
~3 mm(1)
male has a small horn on the mandible(1)
primarily tropical/subtropical and warm temperate zones worldwide(1); origin uncertain, adventive in NA & so. Europe(2)(3)
cereal grains in warehouses(3)
infests cereal grains, pumpkins, tamarind seeds, pulses, nutmeg, and peanuts(1)
Life Cycle
Development from egg to adult is 115–132 days(1)
Works Cited
1.Handbook of urban insects and arachnids: A handbook of urban entomology
Robinson W.H. 2005. Cambridge University Press.
2.California Beetle Project
3.Alien terrestrial arthropods of Europe
Roques A., Kenis M., Lees D., Lopez-Vaamonde C., Rabitsch W., Rasplus J.-Y., Roy D., eds. 2010. BioRisk 4 Special Issue; 2 vols., 1028 pp.