Dr. Murai Éva szerk.: Parasitologia Hungarica 25. (Budapest, 1992)

HELIGMOSOMIDAE Cram, 1927 Heligmosomoides laevis (Dujardin, 1845) Syn.: Strongylus laevis Dujardin, 1845 Host: Microtus arvalis. - Localization: small intestine. Heligmosomoides polygyrus polygyrus (Dujardin, 1845) Syn.: Nematospiroides dubius (Baylis, 1926); Heligmosomoides skrjabini (Schulz 1926) Host: Apodemus microps. - Localization: small intestine. SYPHACIIDAE Skrjabin et Schikhobalova, 1951 Syphacia frederici (Roman, 1945) Syn.: Syphacia obvelata (Rudolphi, 1802) Host: Apodemus microps. - Localization: caecum, rectum. Syphacia nigeriana (Baylis, 1928) Syn.: Syphacia obvelata (Rudolphi, 1802) Host: Microtus arvalis. - Localization: caecum, rectum. Syphacia stroma (Linstow, 1884) Host: Apodemus microps. - Localization: small intestine. Apodemus microps Seasonal variations The number of individuals collected in summer and winter is insufficient for a detailed comparison of the dynamics of the helminth fauna. The general prevalence (GP) for male Apodemus microps was 66.6 % in the spring. At the same time the GP for females was lower (54.5 %). In contrast with the results obtained in the spring, the GP, obtained for males and females decreased considerably in the autumn (19.4 and 15.6 %, respectively). From the general intensity obtained for the small field mouse it can be concluded that animals showed an infection of slightly higher intensity in the spring (14.2 h/male, 15.2 h/female) than in the autumn (12.5 h/male, 9.3 h/female). Of the 8 helminth species found in A. microps in the spring, the invasion of H. polygyrus reached the highest degree. On the other hand, in the autumn the prevalence of C. globifera larvae proved to be the highest (Table 2). Only four helminth species, C. globifera and T. taeniaeformis larvae, H. polygyrus and S. stroma, were demonstrated in individuals captured in the summer and winter season.