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Species Sitona lineellus - Alfalfa Weevil

Weevil 3 - Sitona lineellus weevil - Sitona lineellus Sitona 1 - Sitona lineellus Mini hippopotamus? - Sitona lineellus beetle - Sitona lineellus beetle - Sitona lineellus Sitona lineellus? - Sitona lineellus Weevil Beetle - Sitona lineellus
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 Entiminae (Broad-nosed Weevils)
Tribe Sitonini
Genus Sitona
Species lineellus (Alfalfa Weevil)
Synonyms and other taxonomic changes
=Sitona scissifrons Say
Explanation of Names
Sitona lineellus (Bonsdorff 1785)
common name comes from one of the foodplants (1)
2.9-4.0 mm excluding head
Body length varies from 2.9 to 4.0 mm, excluding head. Integument is generally black with an occasional reddish tinge; tarsi, tibia, femora, and antennae are reddish. The rostrum surface is flat but may be weakly covex on the upper two thirds. The lower third of the rostrum may be weakly concave and the medial carnia is absent. Eyes are strongly covex and protuberant. The length of the pronotum equals the width. The pronotum is widest at the middle, the sides are weakly arcuate and the anterior constriction line is weakly evident. The pronotal surface is covered with deep and close punctures that possess forward pointing, slightly erect scales, giving the surface a shiny appearance. The prosternal groove is approximately equidistant from the fore-coxae and the anterior of the prosternum. Elytral sides are subparallel on the basal half, and the remainder is broadly rounded. Strial punctures are small, weakly impressed and each possesses a small recumbent seta. The vestiture is variable, but generally consists of dense, small, recumbent interstrial scales, that are white or brown. Females are similar to males, but the elytra are more inflated, lateral margins of elytra are more arcuate, the body is larger, and females have a more diffuse colour pattern. Adults are most easily recognized by: a) strongly convex eyes; b) narrow pronotum; c) small body size compared to other Sitona species; and d) median row of narrow and erect scales, coloured white in each elytral interstriae. (Adapted from Bright 1994, Bright and Bouchard 2008)
above text copied from U. of Alberta entomology page (1)
native to, and widespread across the Holarctic, incl. boreal regions; probably native in both Eurasia and NA (1)(2)
Larvae feed on Vicia cracca (vetch) and Medicago sativa (alfalfa), adults on vetch, alfalfa, red clover, alsike clover, peas, sweet clover, pea flower (Caragana arborescens) and garden flowers including tulips and delphinium. (1)
Works Cited
1.University of Alberta Entomology Collection
2.Insects and Arachnids of Canada Series, Part 25. Coleoptera, Curculionidae, Entiminae.
Donald E. Bright, Patrice Bouchard. 2008. 2008. NRC Research Press, Ottawa, Ontario, Canada.