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Genus Sitophilus - Granary Weevils

Weevil - Sitophilus Coleoptera - Sitophilus oryzae Grain weevil? - Sitophilus oryzae Sitophilus oryzae Tiny Weevil  - Sitophilus zeamais Weevil - Sitophilus zeamais Sitophilus Weevil - Sitophilus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Cucujiformia)
Superfamily Curculionoidea
Family Curculionidae (Snout and Bark Beetles)
Subfamily Dryophthorinae
Tribe Rhynchophorini
Genus Sitophilus (Granary Weevils)
Explanation of Names
Sitophilus Schönherr 1838
Greek sitos (σιτος) 'grain' + philos (φιλος) 'loving'(1)
5 spp. in our area, all adventive(2)
2-5 mm
S. oryzae and S. zeamais, the two cosmopolitan spp. with maculate elytra, may be very hard to tell apart, and may form mixed infestations; S. oryzae are often smaller & paler than S. zeamais(3)
worldwide and throughout NA(2)
mostly indoors, but may infest grain in the field(3)
Life Cycle
Adults may live four to five months
S. granarius (Grain Weevil), S. oryzae (Rice Weevil), and S. zeamais (Maize Weevil) are serious stored product pests(2); S. linearis (Tamarind Weevil) is a serious pest of tamarind in the Caribbean and se. US (FL, LA)(4)
n. India has more described species of Sitophilus that any other part of the world; most develop on acorns and are rather large (the small size of the current grain-feeding spp. may be a result of recent adaptation)(5)
Works Cited
1.Composition of scientific words
Brown R.W. 1956. Smithsonian Institution Press, Washington, DC. 882 pp.
2.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
3.Insect and Mite Pests in Food, an Illustrated Key
J. Richard Gorham, editor. 1991. United States Department of Agriculture Handbook 655.
4.Haseeb M., O'Brien C.W., Kairo M.T.K. (2010) Potentially invasive weevil species from the Caribbean countries to the US...
5.Handbook of urban insects and arachnids: A handbook of urban entomology
Robinson W.H. 2005. Cambridge University Press.