Calycomyza promissa
(Frick, 1956)
Calycomyza promissa is a leaf-mining fly in the Agromyzidae. The larvae develop within leaves of various aster (Symphyotrichum), creating distinctive feeding tunnels. It occurs in Canada and the United States.
Pronunciation
How to pronounce Calycomyza promissa: //ˌkæ.lɪ.koʊˈmaɪ.zə prəˈmɪs.ə//
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Identification
of Calycomyza are small, typically 1.5–3 mm in length, with reduced wing venation characteristic of Agromyzidae. Larval mines appear as pale, winding trails or blotches on leaf surfaces, often with visible as dark specks. Specific identification of adults requires examination of male genitalia; the species is distinguished from by subtle differences in aedeagal structure.
Distribution
Canada, United States.
Diet
Larvae feed internally on leaf tissue of Symphyotrichum . Known include Symphyotrichum ascendens, S. chilense, S. drummondii, S. ericoides, S. lateriflorum, S. oolentangiense, S. pilosum, S. praealtum, and S. puniceum.
Host Associations
- Symphyotrichum ascendens - leaf tissue consumed by larvae
- Symphyotrichum chilense - leaf tissue consumed by larvae
- Symphyotrichum drummondii - leaf tissue consumed by larvae
- Symphyotrichum ericoides - leaf tissue consumed by larvae
- Symphyotrichum lateriflorum - leaf tissue consumed by larvae
- Symphyotrichum oolentangiense - leaf tissue consumed by larvae
- Symphyotrichum pilosum - leaf tissue consumed by larvae
- Symphyotrichum praealtum - leaf tissue consumed by larvae
- Symphyotrichum puniceum - leaf tissue consumed by larvae
Behavior
Larvae are endophagous leaf miners, feeding between the upper and lower leaf . Mining activity creates visible trails or blotches that expand as larvae grow.
Ecological Role
As a herbivore on native Symphyotrichum , this fly contributes to natural leaf damage in aster . Its mining activity may increase leaf desiccation and affect plant photosynthetic capacity, though population-level impacts have not been quantified.
Similar Taxa
- Other Calycomyza speciesMany also mine asteraceous plants; accurate identification requires microscopic examination of male genitalia and detailed records.
- Phytomyza speciesRelated agromyzid leaf miners with similar habits on Asteraceae; distinguished by wing venation patterns and larval .
More Details
Taxonomic history
Originally described by Frick in 1956, this has been maintained in the Calycomyza based on morphological and biological characteristics.
Observation frequency
iNaturalist records indicate over 500 observations, suggesting this is relatively frequently encountered where its plants occur.