Morphofunctional transformations of hematophagous insects, connected with forming the type of parasitism is performed by different forms of adaptation morphosis. Most morphological changes occur within the framework of idioadaptations (allomorphoses); which is especially characteristic of all free-living hematophagous groups. The transition of hematophagues to ectoparasitism, especially permanent, is accompanied, besides idioadaptations, by cenogenetic shifts (pupigenous dipterans, hemipterans), as well as by processes of degradation of organs, with a generally hypomorphous development of a group (lice). The degree of reduction of aromorphous characters reflects the level of morphological and ecological specialization of hematophages.
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