The species composition of nematodes found at autopsy of abomasa and small intestines of 24 Mongolian gazelles in Eastern Mongolia is studied. Orloffia bisonis, Marshallagia mongolica, Nematodirus archari, N. andreevi, Trichostrongylus colubriformis, T. probolurus were registered. N. archari and N. andreevi were detected in Mongolian gazelle for the first time. All species of gastrointestinal nematodes found in Mongolian gazelles have already been registered in domestic ruminants of Mongolia. The validity of Orloffia genus is confirmed based on our own observations and literature data. Orloffia is monotypic genus with the only species O. bisonis represented by two morphs where “O. bisonis” is major and “O. kasakhstanica” is minor.
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