| Abstrakt: |
Abstract: The morphology of four species of avian nematodes was studied using scanning electron microscopy (SEM): Porrocaecum depressum (Zeder, 1800) from Buteo buteo; third- and fourth-stage larvae of Porrocaecum semiteres (Zeder, 1800) from Larus ridibundus and Turdus philomelos; Acuaria anthuris (Rudolphi, 1819) from Corvus frugilegus; Cosmocephalus obvelatus (Creplin, 1825) from Larus ridibundus. The examination of the head end of adult Porrocaecum depressum and fourth-stage larvae of P. semiteres revealed a pattern of labial papillae that is typical of ascaridoid genera. The structure of the head end of third- and fourth-stage larvae of P. semiteres seems to be identical with that of the related P. ensicaudatum, which occurs in the same species of intermediate and definite host. The fourth-stage larvae of P. semiteres was redescribed. A detailed examination of the oral region of Acuaria anthuris revealed teeth at the anterior end of the cordons, which may serve to host tissue damage during feeding. The deirids of A. anthuris are very small, with a bicuspid tip. Morphology, surface ultrastructure, nem |
