Eriocraniella mediabulla

Distinguished from other Eriocraniella by the combination of uniformly black forewings with golden to bluish luster and the male genitalic character of a midventral knoblike process on the vinculum. The purplish luster on the costal half of the hindwings also aids identification. Geographic restriction to the Atlantic and Gulf coastal plain helps separate it from related species with overlapping ranges.

Small moth with forewings 3.8–4.1 mm in males and 3.3–3.7 mm in females. Forewings uniformly black with golden to bluish metallic luster. Hindwings slightly paler, fuscous with purplish luster along costal half.

Associated with oak-dominated habitats in coastal plain environments. Larval habitat is the leaf tissue of host oaks.

Atlantic and Gulf coastal plain from north-eastern Texas and Louisiana eastward through Florida, Georgia, and North Carolina.

Adults active from early March to mid-April. One generation per year.

Larvae feed on Quercus nigra (water oak) and possibly Quercus falcata (southern red oak), Quercus alba (white oak), Quercus hemisphaerica (sand live oak), Quercus virginiana (live oak), and other oak species.

• Quercus nigra - confirmed larval hostprimary host
• Quercus falcata - possible larval hostunconfirmed
• Quercus alba - possible larval hostunconfirmed
• Quercus hemisphaerica - possible larval hostunconfirmed
• Quercus virginiana - possible larval hostunconfirmed

Egg stage not described. Larva mines leaves of host oaks, beginning with serpentine mine in upper epidermis along leaf edge, expanding to full-depth blotch mine in apical portion of leaf. Full-grown larva exits through hole cut in lower leaf surface, drops to soil, burrows, and spins cocoon. Pupation in soil. Adult emergence in early spring.

Larvae exhibit characteristic leaf-mining behavior with two distinct mine phases: initial serpentine epidermal mine followed by blotch mine. Full-grown larvae actively exit mines and burrow into soil to pupate.

Leaf miner on oaks; contributes to herbivory pressure on Quercus species in coastal plain ecosystems. Specific ecological impacts not quantified.

No documented economic or medical significance. Of interest to lepidopterists and entomologists studying primitive moth lineages and leaf-mining insects.

• Other Eriocraniella speciesDistinguished by male genitalic characters (midventral knoblike process on vinculum) and wing coloration patterns; many species have more restricted geographic ranges
• Other EriocraniidaeFamily members share primitive moth characteristics but differ in host associations, geographic distribution, and adult phenology

• leaf miner
• oak feeder
• spring emergence
• coastal plain endemic
• primitive moth

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon