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[Diagnosis of subgenera of the genus Dermacentor Koch by the larva and nymph and new data on the distribution of the subgenus Asiacentor (Ixodidae)].

On the basis of parallel study of natural and cultivated preimaginal phases of the genus Dermacentor differential diagnoses of three palaearctic subgenera were worked out: Asiacentor Filippova et Panova , 1974, Serdjukovia Dias , 1963 and Dermacentor (s. str.) 1844. The diagnoses are also based on peculiarities of chaetotaxy and other characters of small sizes. On the basis of identification of species of the subgenus Asiacentor on immature phases new sites of their distribution were found out: D. pavlovskyi : in the Issyk - Kul hollow, in the foothills from the side of Terskey - Alatau ridge; D. montanus: in Gissarsky ridge in the environs of Lake Iskander - Kul . Remoteness of these cites from the distribution borders known earlier point to ecological and geografical differential peculiarities of the subgenus and its species.

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