| Summary: | The aim of this paper is to study the diversity of parasite fauna in Microtus arvalis from various biocenoses, depending on the species and age of the host. The results of parasitological investigations showed a prevalence of Paranoplocephala omphaloides of 16.1%, respectively of Rodentolipis straminea - 19.3%, Catenotaenia cricetorum - 6.5%, Skrjabinotaenia lobata - 22.5%, Mesocestoides lineatus larvae 12.9 %, Hydatigera taeniaeformis larvae - 12.9%, Capillaria hepatica - 22.6%, Syphacia stroma 16.1%, Syphacia obvelata - 38.7%, Heligmosomoides polygirus - 19.4%, Strongyloides ratti - 12.9%, Mastophorus muris - 29.0% and invasion with Trichocephalus muris has a prevalence of 22.5%. The taxonomic structure consists of 3 classes, 11 families, 12 genera and 13 species, of which 6 parasitic species belong to the Cestoda class, with a share of 46.2% of the total species, 5 species to the Secernentea class with a share of 38,4%, and 2 species - to the Adenophorea class, constituting 15.4% of the total identified species. The development characteristic is represented by 6 species that develop according to the monoxen model S. stroma, S. obvelata, C. hepatica, T. muris, H. polygirus, S. ratti, 7 species with polygenic evolution, including 6 species with development after the dixen model with the presence of exogenous forms H. taeniaeformis larvae, M. muris, S. lobata, C. cricetorum, P. omphaloides, R. straminea and one species evolving according to the trixen model M. lineatus larvae. Scopul acestei lucrări constă în studiul diversității parazitofaunei la Microtus arvalis din diverse biocenoze, în funcție de vârstă și specia gazdei. Rezultatele investigațiilor parazitologice au pus în evidență o prevalență cu Paranoplocephala omphaloides de 16,1%, respectiv cu Rodentolipis straminea ndash; 19,3%, Catenotaenia cricetorum ndash; 6,5%, Skrjabinotaenia lobata ndash; 22,5%, Mesocestoides lineatus larvae 12,9%, Hydatigera taeniaeformis larvae ndash; 12,9%, Capillaria hepatica ndash; 22,6%, Syphacia stroma ndash; 16,1%, ...
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