of Zoology series which treat the systematics and biology of Coleoptera. Coleoptera are by far the most species-rich order of insects and theWith over 380,000 described species, Coleoptera are by far the most species-rich order of insects and the largest group of animals of comparable geological age. Coleoptera, Beetles. Morphology and Systematics: Archostemata, Adephaga, Myxophaga, Polyphaga partim (Handbook of Zoology. Arthropoda. Insecta. Orthoptera, Blattodea, Coleoptera, Mecoptera, Diptera, 16 Handbuch der Zoologie, IV, 2-1/4 Pt. I. Introduction and the order Mecoptera. - Bull. With approximately 350,000 described species, Coleoptera are by far the most species-rich order of insects and the largest group of animals of comparable