Mesoraphidiidae

Definition

An extinct family of snakeflies (Raphidioptera: Raphidiomorpha) known from the Late Jurassic through the Late Cretaceous, comprising approximately twenty-five genera preserved as compression fossils and amber inclusions. The family was established in 1925 by paleoentomologist Andrey V. Martynov based on Upper Jurassic material from Kazakhstan, later expanded through synonymization of related snakefly families, and subdivided into three subfamilies and one tribe to clarify internal relationships.

Etymology

From Greek meso- (middle) + Raphidia (type genus of snakeflies, from Greek rhaphis, needle) + -idae (family suffix)

Example

The genus Alloraphidia, a mesoraphidiid known from Cretaceous amber deposits in Lebanon and Myanmar, preserves detailed wing venation and body structure that helps clarify the evolutionary transition between basal and modern snakefly lineages.

Related Terms

• Raphidioptera
• Raphidiomorpha
• snakefly
• compression fossil
• amber inclusion
• Jurassic
• Cretaceous
• Alloraphidia
• Martynov

Usage Notes

Mesoraphidiidae represents a stem-group lineage within Raphidiomorpha, not the direct ancestor of modern Raphidiidae. The family's temporal range (Late Jurassic–Late Cretaceous) spans approximately 80 million years, with greatest diversity in the Cretaceous. Specialists distinguish mesoraphidiids from modern snakeflies by plesiomorphic wing characters and body proportions visible in fossil material. The 2002 synonymization of several smaller families into Mesoraphidiidae reflects ongoing revision of snakefly phylogeny rather than simple lumping; the 2011 subfamilial classification (Alloraphidiinae, Mesoraphidiinae, Nanoraphidiinae, plus tribe Huaxiaraphidiini) provides a working hypothesis of relationships among included genera.