THYSANURA

Key Characters: Apterygote (primitively wingless) Body flat, often covered with dusty scales Three terminal filaments, roughly equal in length including two cerci and a median caudal filament.: Apterygote (primitively wingless)
Body flat, often covered with dusty scales
Three terminal filaments, roughly equal in length
including two cerci and a median caudal filament.; Body flat, often covered with dusty scales
Three terminal filaments, roughly equal in length
including two cerci and a median caudal filament.; Three terminal filaments, roughly equal in length
including two cerci and a median caudal filament.

Key Characters: