Ostertagia is a genus of nematodes belonging to the family Trichostrongylidae.
The genus has cosmopolitan distribution.
Species: Ostertagia antipini Ostertagia arctica Ostertagia buriatica Ostertagia dahurica Ostertagia drozdzi Ostertagia gruehneri Ostertagia kolchida Ostertagia lasensis Ostertagia leptospicularis Ostertagia lyrataeformis Ostertagia mossi Ostertagia murmani Ostertagia nemorhaedi Ostertagia orloffi Ostertagia ostertagi Ostertagia skrjabini Ostertagia trifurcata Ostertagia volgaensis
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