Comprehensive Description

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General Description

Body length ranges from 3.2 to 4.5 mm. Integument is generally black or light brown, with variations. Antennae, tibia and tarsi may be reddish, these also vary. Rostrum is flat, but lower third is bisulcate with indistinct median carnia located between apical concavities. Rostral surface is shiny, with deep and close punctures, each puncture possesses a slightly erect and narrow scale. Recumbent scales are located in the interpucture spaces. Eyes are moderately convex. Pronotum is widest slightly behind the mid-line, sides are arcuate, anterior constriction line is only weakly evident. Surface of pronotum is shiny, with many close and deeply impressed punctures, with scales as on the rostrum. The prosternal groove touches the fore-coxae cavities. Vestiture of elytra with intermixed elongate and small scales and recumbent to slightly erect flattened setae that are as long as or slightly longer than the scales. Setae and scales occur in approximately equal numbers. Stripe pattern is variable, with white scales often on striae 3, 5, and 7, and brown scales on 2, 4, and 6. (Adapted from Bright 1994, Bright and Bouchard 2008) Adults of Sitona lineatus are distinguished from their close relatives by the elytra stripe pattern that extends onto the pronotum. When weevils have lost the scales that form the stripe pattern, due to age or activity, they can be easily distinguished by examining the ventral surface of the pronotum. The fore-coxal cavities touch, or nearly touch, a narrow groove located on the ventral surface of the pronotum. In all other Sitona species, the fore-coxae do not touch this groove. (Adapted from Bright 1994, Bright and Bouchard 2008)


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© University of Alberta Museums

Source: University of Alberta Museums

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