Synanthedon decipiens

Distinguished from similar clearwing moths by its association with oak galls and specific wing pattern. Most similar to other Synanthedon species, but S. decipiens specifically targets cynipid wasp galls on oaks. The combination of small size (12 mm wingspan), eastern North American distribution, and emergence from oak galls is diagnostic. Adults may be separated from wasps by the presence of scales on wing margins and body, and by resting posture with wings folded along body.

Associated with oak forests and woodlands where host galls occur. Adults observed nectaring on flowers including goldenrod (Solidago species). Larval habitat confined to woody galls on oak trees formed by cynipid wasps.

Eastern North America, ranging west to the Rocky Mountains. Records from throughout the eastern United States. Distribution tied to presence of oak species and their associated cynipid gall-formers.

Adults active primarily in June. Evidence from Georgia suggests a bimodal seasonal pattern with possible second generation in September. September records from Missouri support this potential two-generation cycle in at least part of the range.

• cynipid wasp galls on oaks - larval developmentLarvae bore within woody oak galls induced by cynipid wasps (family Cynipidae). Specific gall-forming wasp species not definitively documented in sources.

Larva bores within woody oak gall, feeding on gall tissue. Pupation occurs within the gall. Adult emerges from gall, leaving an exit hole. Adult stage brief, focused on mating and dispersal. Number of generations per year possibly two in southern portions of range, one in northern areas.

Adults are diurnal and engage in wasp mimicry, including wasp-like flight. Males use pheromones to locate females; males have been observed approaching pheromone lures. Adults visit flowers for nectar. Generally not attracted to light traps, though some related Synanthedon species occasionally appear at blacklights.

Larva acts as a secondary inhabitant of oak galls, utilizing structures created by gall-forming cynipid wasps. Adult serves as pollinator when nectaring. Was mimicry provides protection from predators.

No significant economic impact documented. Occasionally encountered by entomologists and naturalists. Pheromone-based survey methods developed for related clearwing species have been applied to this group for detection and monitoring.

• Synanthedon acerniAnother eastern North American Synanthedon species; distinguished by host association with maple rather than oak galls, and different adult phenology.
• Synanthedon scitulaRelated clearwing species occasionally found at blacklights; differs in host plant associations and geographic distribution patterns.
• Euhagena nebraskaeClearwing moth with similar wasp mimicry but much larger size, strongly bipectinate male antennae, white thoracic tufts, and western distribution.

• Sesiidae
• clearwing moth
• wasp mimicry
• oak gall
• boring insect
• diurnal moth
• eastern North America
• June emergence

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Lepidoptera | Beetles In The Bush | Page 7
• Euhagena nebraskae… again | Beetles In The Bush