Mecopterida

Definition

A superorder of Holometabola comprising the orders Mecoptera (scorpionflies), Siphonaptera (fleas), Diptera (true flies), Trichoptera (caddisflies), and Lepidoptera (butterflies and moths). Historically proposed based on morphological synapomorphies including reduced or lost ovipositor, a pleuro-axillary wing muscle, and specific larval mouthpart and wing venation characters; monophyly now corroborated by molecular phylogenetics. Often treated as synonymous with Panorpida in current literature.

Etymology

From Mecoptera (scorpionflies, the type order) + -ida (superorder suffix).

Example

The superorder Mecopterida unites the scorpionflies and their relatives with the megadiverse Lepidoptera and Diptera, representing one of the most successful radiations within the holometabolous insects.

Synonyms

• Panorpida

Related Terms

• Holometabola
• Mecoptera
• Diptera
• Lepidoptera
• Trichoptera
• Siphonaptera
• Amphiesmenoptera
• Antliophora
• ovipositor

Usage Notes

The name Mecopterida emphasizes the historical centrality of Mecoptera in defining this clade, whereas Panorpida (from Panorpa, a mecopteran genus) is an alternative designation with equal taxonomic scope. Some phylogenetic schemes recognize nested subclades Amphiesmenoptera (Trichoptera + Lepidoptera) and Antliophora (Mecoptera + Siphonaptera + Diptera) within Mecopterida. Usage varies by author and data type (morphological versus molecular).