Fleas (Siphonaptera) is a biological order of the phylum Arthropoda (Arthropods) and class Insecta (Insects).
Mantophasmatodea
Megaloptera
Zoraptera
Neuroptera
Hymenoptera
Coleoptera
Lepidoptera
Trichoptera
Blattodea
Orthoptera
Odonata
Dermaptera
Siphonaptera
Diptera
Mecoptera
Grylloblattodea
Archaeognatha
Ephemeroptera
Phasmida
Zygentoma
Raphidioptera
Plecoptera
Strepsiptera
Thysanoptera
Hemiptera
Embioptera