Hedylidae

Definition

A family of small, nocturnal Lepidoptera endemic to the Neotropics, comprising the single genus Macrosoma with approximately 35 species. Historically treated as the superfamily Hedyloidea and regarded as the extant sister group to butterflies (Papilionoidea), but molecular phylogenetic studies have reclassified Hedylidae as a derived lineage within Papilionoidea itself—making them, by current usage, butterflies rather than moths despite their moth-like resting posture and non-clubbed antennae.

Etymology

From Greek hedylos (sweet, pleasant), with family suffix -idae.

Example

Hedylid adults resemble geometrid moths in appearance but share derived wing-coupling mechanisms and molecular signatures with butterflies, illustrating how convergent morphology can obscure phylogenetic relationships until genetic data resolve them.

Synonyms

• American moth-butterflies

Related Terms

• Papilionoidea
• Macrosoma
• Hedyloidea
• Rhopalocera
• Lepidoptera phylogenetics
• Convergent evolution

Usage Notes

The term 'moth-butterflies' reflects historical uncertainty; specialists now generally treat hedylids as butterflies. The family's reclassification exemplifies ongoing revision in Lepidoptera higher-level systematics driven by molecular phylogenetics. Contrast with Hesperiidae (skippers), the other butterfly group once considered intermediate between moths and true butterflies.