Calycomyza new-species-on-baccharis-halimifolia

Identification relies on host association with Baccharis halimifolia and larval leaf mines. Adult Calycomyza are small (2–3 mm), with reduced chaetotaxy and characteristic wing venation including a reduced or absent anal vein. Species-level identification requires examination of male genitalia and comparison with described congeners. Mines appear as linear-blotch patterns on Baccharis leaves.

Associated with Baccharis halimifolia, which grows in coastal dunes, salt marshes, disturbed areas, and open woodlands. The fly inhabits wherever its host plant occurs.

Range corresponds to that of Baccharis halimifolia: Atlantic and Gulf coastal plains of North America, from Massachusetts to Texas and inland to Arkansas.

Larvae feed internally in leaves of Baccharis halimifolia, creating mines between leaf surfaces. Adults do not feed on plant material.

• Baccharis halimifolia - hostlarval leaf miner

Complete metamorphosis with egg, larval, pupal, and adult stages. Larvae develop within leaf mines, pupating either within the mine or in soil. Specific timing and number of generations undetermined.

Adults are active fliers near host plants. Larvae are endophagous, feeding between epidermal layers.

As a leaf miner, larvae may reduce photosynthetic capacity of host plants. Serves as prey for parasitoid wasps. Population impacts on host plant health unknown.

No documented economic or medical importance. Potential minor interest for biological control research given Baccharis halimifolia's status as an invasive weed in some regions outside native range.

• Calycomyza platypteraAlso associated with Baccharis species; distinguished by male genitalia and mine morphology
• Phytomyza speciesOther agromyzid leaf miners on Asteraceae; distinguished by wing venation and larval mandible structure

• leaf miner
• undescribed species
• Asteraceae
• Agromyzidae
• provisional name

• BugGuide