animal order - the order of animals

division Eubacteria - one-celled monerans having simple cells with rigid walls and (in motile types) flagella

family Rickettsiaceae, Rickettsiaceae - microorganism resembling bacteria inhabiting arthropod tissues but capable of causing disease in vertebrates

Chlamydiaceae, family Chlamydiaceae - gram-negative parasites in warm-blooded vertebrates