Evolution and Diversity -- Arthropod Evolution -- Insect Diversity -- External Structure -- Systematics and Taxonomy -- Apterygote Hexapods -- Paleoptera -- The Plecopteroid, Blattoid, and Orthopteroid Orders -- The Hemipteroid Orders -- The Panorpoid Orders -- The Remaining Endopterygote Orders -- Anatomy and Physiology -- The Integument -- Sensory Systems -- Nervous and Chemical Integration -…