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Keywords: mite parasites, general phenomena in relation with parasitism in mites, antiquity of parasitic mites, specificity in the parasitic mites, origin of the parasitism in mites: pre-adaptation to parasitism in Pyroglyphidae, morphological adaptations to parasitism, correlation between evolution of host and parasite, specificity and parallel-evolution host-parasite in the Myobiidae, specificity of Myobiidae, correlation between the evolution of the Myobiidae and of their hosts, evaluation of the primitivity in the Myobiidae, regressive evolution of metazoan parasites explained by the immunological reactions of their hosts, Sarcoptes. The general phenomenon in relation with the adaptation to parasitism are discussed.