Ampelomyia

Adults can be distinguished from other Schizomyiina genera by the presence of a ventroapical extension on tarsomere I. Larvae are characterized by abdominal segment VIII bearing a posterodorsal lobe and a dorsally shifted pair of pleural papillae. These morphological features, combined with molecular phylogenetic analysis, support the generic distinction.

Found in association with Vitis (grape) species, forming leaf galls on both wild and cultivated grapes. In Japan, documented on cultivated Vitis coignetiae cultivar Suzumi-murasaki and wild V. coignetiae, V. flexuosa, and V. ficifolia in northern Japan.

Palaearctic and Nearctic regions. The type species A. conicocoricis occurs in northern Japan. The other three species (A. viticola, A. vitiscoryloides, A. vitispomum) are distributed in the Nearctic region, with records from the United States including Vermont.

• Vitis coignetiae - gall induction on leavesboth cultivated (cultivar Suzumi-murasaki) and wild forms
• Vitis flexuosa - gall induction on leaveswild populations in northern Japan
• Vitis ficifolia - gall induction on leaveswild populations in northern Japan
• Vitis - gall inductiongenus-level association for all four Ampelomyia species; specific host data not detailed for Nearctic species

Induces conical leaf galls on host Vitis plants. Gall formation was previously misidentified as Schizomyia viticola based on gall shape alone, indicating that gall morphology can be convergent and unreliable for species identification without accompanying morphological or molecular analysis.

Gall inducer on Vitis species. Creates specialized plant structures that provide habitat and nutrition for developing larvae, potentially affecting leaf function in host grape plants.

Associated with cultivated grape varieties (Vitis coignetiae), which may have implications for viticulture, though specific economic impact has not been documented. The genus was described in part from specimens collected from cultivated plants in Japan.

• Schizomyia viticolaPreviously misidentified as this species based on similar conical gall shape; distinguished by larval and adult morphological characters and molecular phylogeny
• Other Schizomyiina generaDistinguished by the combination of ventroapical extension on tarsomere I in adults, and larval features including posterodorsal lobe on abdominal segment VIII and dorsally shifted pleural papillae

Gall shape alone is insufficient for identification; A. conicocoricis was previously misidentified as Schizomyia viticola based on the conical shape of its leaf galls, demonstrating that morphological convergence in gall structure can lead to taxonomic errors without detailed examination of insect morphology.

• gall midge
• Cecidomyiidae
• Vitis
• grape
• gall inducer
• Asphondyliini
• Schizomyiina
• Palaearctic
• Nearctic
• Japan
• leaf gall

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Ampelomyia, a new genus of Schizomyiina (Diptera: Cecidomyiidae) associated with Vitis (Vitaceae) in the Palaearctic and Nearctic regions, with description of a new species from Japan