Strauzia longipennis

Distinguished from other sunflower-feeding tephritids by larval feeding location (stems vs. heads or seeds). Adults separable from Gymnocarena diffusa and Neotephritis finalis by wing pattern and larval damage symptoms. The F-shaped wing marking is a key visual diagnostic. Genetic studies have identified two sympatric lineages in eastern Iowa (corresponding to former varieties typica and vittigera) that may represent cryptic species.

Adults are relatively large for Tephritidae, approximately 6 mm in body length with wings around 7 mm. The body is yellow to orange. The wing displays orange to brown bands that usually form a distinct F-shaped marking near the wing tip. Larvae are yellowish-white, reaching about 5 mm in length.

Associated with sunflower-growing areas; agricultural fields, roadsides, and other habitats where Helianthus species occur. Specific microhabitat requirements beyond host plant presence are not well documented.

North America: widespread across USA (Arizona, California, Colorado, Connecticut, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Jersey, New Mexico, North Carolina, North Dakota, Ohio, Oregon, Pennsylvania, South Dakota, Texas, Utah, Vermont, Virginia, Wisconsin) and Canada (Alberta, Manitoba, Ontario, Quebec). Europe: Germany (introduced or established).

Adults active from May to August, with timing varying by location. Larval development within host stems lasts approximately 30 days. Pupae overwinter in plant bases or soil.

Larvae mine stems of sunflowers (Helianthus spp.), feeding on spongy tissue. Specific adult feeding habits are not documented in available sources.

• Helianthus annuus - larval hostPrimary host; larvae mine stems
• Helianthus spp. - larval hostGenus-level host association

Eggs laid on or near sunflower stems. Larvae feed internally in stems for approximately 30 days. Pupation occurs in base of plant or in soil, with pupae overwintering. Adults emerge in spring to mid-summer. Single or partial generations per year depending on location.

Larvae are endophytic stem miners. Adults have been observed from May through August. No specific adult behaviors such as mating displays or dispersal patterns are documented in available sources.

Minor herbivore of native and cultivated sunflowers. Larval mining creates limited damage to spongy stem tissue. Does not damage seeds or flower heads, reducing economic impact compared to other sunflower tephritids.

Minor agricultural pest of sunflower crops. Damage is typically light and limited to spongy stem tissue; does not affect yield-significant plant parts (seeds, flower heads). Often confused with more damaging sunflower-feeding tephritids. Genetic research on this species has contributed to understanding of incipient speciation and host race formation.

• Gymnocarena diffusaAlso called 'sunflower maggot'; distinguished by larval feeding in flower heads rather than stems
• Neotephritis finalisSunflower seed maggot; distinguished by larval feeding on developing seeds rather than stems

The common name 'sunflower maggot' is shared with two other tephritid species (Gymnocarena diffusa and Neotephritis finalis), causing confusion about which species causes which type of damage. Strauzia longipennis does NOT damage flower heads or seeds, contrary to what the shared name might imply.

• agricultural pest
• stem miner
• incipient speciation
• North America
• Europe introduced

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Grasshoppers of Colorado
• Grasshoppers of Colorado
• Grasshoppers of Colorado
• Grasshoppers of Colorado
• List of Species Fact Sheets| Grasshoppers of Wyoming and the West
• High Plains Grasshopper
• Strauzia longipennis . [Distribution map].
• Incipient Speciation in Strauzia longipennis (Diptera: Tephritidae): Two Sympatric Mitochondrial DNA Lineages in Eastern Iowa