Cosmopterix callichalca
Cosmopterix callichalca is a small in the Cosmopterigidae with a forewing length of 3.1–5.7 mm. It is native to the Americas, with records from Argentina, Brazil, and the southern and midwestern United States. The larvae are leaf miners on Schizachyrium scoparium. The exhibits geographic variation in voltinism: in Michigan, in the southern United States, and likely multivoltine in Brazil.
Pronunciation
How to pronounce Cosmopterix callichalca: //kɒzˈmɒptərɪks ˌkælɪˈkælkə//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from by the combination of: five white lines in forewing basal area; yellow transverse fascia with two tubercular pale golden metallic spots at inner edge and two smaller spots at outer edge; larger protrusion of transverse fascia that can vary from small to very large; shining white apical line connected to apical protrusion. Male with greyish white, narrower markings compared to females. The larval mine on Schizachyrium scoparium is diagnostic: starts as narrow gallery near midrib on upperside, follows midrib then widens to occupy half leaf width, crosses midrib before leaf apex, with -filled upper portion and silk-lined, frass-free lower portion where occurs.
Habitat
Associated with supporting Schizachyrium scoparium, a grass of prairies, savannas, and open woodlands. In the United States, found in tallgrass prairie remnants and similar grassland . Brazilian and Argentine records suggest adaptability to tropical and subtropical grassland and open vegetation formations.
Distribution
Argentina (Salta); Brazil (Amazonas, Distrito Federal, Goiás, Minas Gerais); United States (Alabama, Florida, Louisiana, Michigan, Mississippi, Texas).
Seasonality
: Michigan in June–July; southern United States April–May and August–September; Brazil March–May and December. Larvae: Michigan collected in August, hibernate in mines and emerge as adults May–June following year.
Diet
Larval : Schizachyrium scoparium. Larvae mine leaves, feeding on internal leaf tissue. feeding habits unknown.
Host Associations
- Schizachyrium scoparium - larval plantLarvae mine leaves; specific to this grass
Life Cycle
stage unknown. Larva: yellow body, very pale brown and prothoracic plate, almost colourless anal plate, transparent thoracic legs. Mines leaves of Schizachyrium scoparium: narrow gallery near midrib initially, widening to half leaf width, crossing midrib before leaf apex; upper portion filled with , lower portion silk-lined and frass-free. Pupa: shining dark brown, formed in silk-lined lower mine portion in upward position with attached to silk lining. emerges through semi-circular slit. Voltinism varies by latitude: in Michigan (larvae overwinter, adults emerge following spring); in southern United States; likely multivoltine in Brazil.
Behavior
Larvae construct linear leaf mines with distinct architecture: -occupied upper section and silk-lined, frass-free lower chamber. emerge through semi-circular exit slit cut from inside the mine.
Ecological Role
on native prairie grass; contributes to nutrient cycling through herbivory and creates microhabitat for . Specific ecological relationships beyond association unknown.
Human Relevance
No direct economic or agricultural significance documented. Potential for prairie health given specific association with Schizachyrium scoparium and documented decline of native grasslands.
Similar Taxa
- Other Cosmopterix speciesMany share metallic spotting and transverse fasciae; C. callichalca distinguished by specific pattern of five white basal lines, configuration of metallic spots, and association with Schizachyrium scoparium
More Details
Voltinism and climate
The demonstrates clear latitudinal gradient in per year: single generation in Michigan's temperate climate, two generations in southern United States, and likely continuous breeding in tropical Brazil. This pattern reflects phenotypic plasticity or local in response to growing season length.