Explanation for why we don’t see two-foot-long dragonflies anymore fails - Ars Technica

Explanation for why we don’t see two-foot-long dragonflies anymore fails  Ars TechnicaOxygen supply through the tracheolar–muscle system does not constrain insect gigantism  NatureGiant dragonflies once roamed Earth’s skies. New research upends the textbook theory of why they went extinct  The ConversationEarth's first insects were massive, some having wingspans over two feet long, and scientists aren't sure why  Earth.comStudy Challenges Popular Theory on Why Primordial Bugs Were So Darn Huge  Gizmodo