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Species Hadroplontus litura - Canada Thistle Stem Weevil

Weevil - Hadroplontus litura Hadroplontus litura
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 Curculionoidea (Snout and Bark Beetles)
Family Curculionidae (Snout and Bark Beetles)
Subfamily Ceutorhynchinae (Minute Seed Weevils)
Tribe Ceutorhynchini
Genus Hadroplontus
Species litura (Canada Thistle Stem Weevil)
Other Common Names
Canadian Thistle Stem Weevil
Synonyms and other taxonomic changes
Ceutorhynchus litura
Explanation of Names
Hadroplontus litura (Fabricius 1775)
3.0-3.7 mm(1)
native to w. Palaearctic(2), intentionally introduced in NA and now widespread across Canada & n. US (VA-NE-OR)(3)(4)
disturbed areas with high thistle density(4)
hosts: Cirsium spp., esp. C. arvense (Canada thistle); occasionally Carduus defloratus(2)(4)
Life Cycle
one generation per year(4)
introduced to combat invasive thistles(3), first to Canada (1965), then to the US (early 1970s)(4)
Internet References
Fact sheets: Early & Frazer (2002-2008) (MT)(5) | anon. (BC)(6) | McClay (2002)(7)