[Ultrastructural features of histopathologic changes at the site of attachment of the larva of the Ixodid tick Haemaphysalis longicornis to the body of the host].

This article continues the series of electronic microscopical investigations of tick attachment and host's inflammatory reaction in the attachment site. In all this works we used larvae of different Ixodid ticks but the same species of the host (white mouse), Ixodid species having different type of attachment. Dermacentor marginatus (Amosova, 1989a) is characterized by the superficial penetration of mouth parts, the abundance of cement around them and on the surface of the host's skin, the mouth parts of Hyalomma asiaticum are fully inserted and the superficial cement is minimal (Amosova, 1989b) and Ixodes ricinus has mouth parts inserted more deeply in the skin tissue of the host and the cement substance localised only on the surface of the skin at the 1st and 2nd days of feeding period. For this investigation we choose Haemaphysalis longicornis because it is known (see Kemp et al., 1982) that genus Haemaphysalis has the most superficial localisation of the mouth parts in the attachment site. We have studied a fine structure of cement cone and the cement substance surrounding the mouth parts in the skin and have demonstrated that it is very similar to the Dermacentor marginatus cement structure. The pattern of cellular response is similar to D. marginatus lesion too.