Anteros formosus

Anteros formosus is a metalmark butterfly in Riodinidae. [2]

The dark upperside has a conspicuous white forewing patch. Beneath, cream areas contrast with reddish-brown lines and spots, with greenish reflections on parts of the pattern. Males and females have similar wing markings. [1]

In Costa Rica's Guanacaste region, it inhabits rainforest understory and openings along paths and forest margins. [1]

The pupa retains a covering of larval hairs. Guanacaste rearings recorded a pupal period of approximately 8–15 days. [1]

Guanacaste hosts include Conostegia xalapensis and several Miconia species in Melastomataceae, together with Vochysia guatemalensis and V. ferruginea in Vochysiaceae. [1]

Adults fly during daylight. The caterpillars occur singly on their host plants. [1]

Mature larvae carry long, white, branched setae and a row of orange, balloon-shaped setae on the shield behind the head. Clusters of perforated cupola organs lie near the spiracles, the respiratory openings along the body. [2]