Protorthoptera

Definition

An extinct order of Palaeozoic insects known from the Middle Carboniferous to the Permian, representing a paraphyletic assemblage of basal neopterans that includes ancestors of all polyneopterous insects. Characterized by pronotal lobes that may expand into shield-like structures, these insects are among the earliest winged insects in the fossil record and serve as a classic example of a wastebasket taxon—historically grouping diverse basal lineages before modern phylogenetic methods refined their placement.

Etymology

From Greek 'protos' (first, earliest) + 'orthos' (straight, correct) + 'pteron' (wing), referring to their early position among winged insects and their presumed relationship to Orthoptera.

Example

Fossil specimens from the Mazon Creek Lagerstätte, such as those attributed to Protorthoptera, display the expanded pronotal lobes and primitive wing venation that characterize this basal neopteran grade, though many such specimens have since been reassigned to more precise clades like Orthoptera or Plecoptera based on refined anatomical analysis.

Related Terms

• Neoptera
• Polyneoptera
• Orthoptera
• Plecoptera
• Carboniferous insects
• wastebasket taxon
• paraphyly
• Paleodictyoptera
• Caloneurodea

Usage Notes

The term is used historically and in paleontological literature, but specialists now recognize Protorthoptera as paraphyletic rather than a true monophyletic order. Modern systematic work often reassigns protorthopteran-grade fossils to more precise clades. The group is significant for understanding early neopteran diversification and the evolutionary origins of polyneopteran orders.