Cylindrocopturus dehiscens

Members of the genus Cylindrocopturus are small weevils, typically 3–5 mm in length, with mottled brown and white coloration that provides camouflage against plant stems and debris. C. dehiscens is likely similar in appearance to the closely related sunflower stem weevil C. adspersus, which has a brown and white mottled pattern and measures approximately 4–5 mm. Definitive identification to species level requires examination of genitalic structures or other microscopic features.

Associated with sunflower (Helianthus) habitats, including cultivated sunflower fields and stands of native sunflowers.

Distribution records are sparse. The species has been documented in North America, with at least one observation record in the iNaturalist database. Specific range boundaries are not well established.

• Helianthus - associatedGenus-level association inferred from congeneric species biology; specific host records for C. dehiscens not documented in available sources.

• Cylindrocopturus adspersusClosely related congeneric species with similar appearance, habitat, and life history; both are sunflower-associated stem weevils. C. adspersus is a documented pest in Texas sunflower production, while C. dehiscens status as a pest is unclear.

• weevil
• Curculionidae
• sunflower-associated
• stem-borer
• North America

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Managing Insect Pests of Texas Sunflowers - AgriLife Extension Entomology
• Bug Eric: More Insects From Sunflowers