Sitona

Definition

A large genus of weevils (Coleoptera: Curculionidae) distributed across the Nearctic and Palaearctic regions, comprising over 100 described species. Diagnostic features include flat, recumbent scales on the mandibles, absence of an oval mandibular scar, a short and broad rostrum with a deep longitudinal median groove, and dense body scaling. Many species are associated with leguminous host plants.

Etymology

From Ancient Greek σῑτώνης (sītṓnēs, "buyer of corn or wheat"), alluding to the grain-like appearance or habits of these weevils.

Example

Sitona discoideus and Sitona humeralis are common European species whose larvae feed on root nodules of clovers and other Fabaceae, occasionally reaching pest status in forage crops.

Related Terms

• Curculionidae
• weevil
• rostrum
• Mandible
• scales
• Nearctic
• Palaearctic
• root nodule feeder
• legume pest

Usage Notes

The genus is morphologically cohesive and readily distinguished from related curculionid genera by the combination of rostral and mandibular characters described above. Species-level identification often requires examination of male genitalia or host-plant association. Some species, particularly S. humeralis and S. lineatus, are economically significant as pests of clover and alfalfa. The genus was established by Germar in 1817.