Melnychuk, V., Yevstafieva, V., Pishchalenko, M., Reshetylo, O. and Antipov, A. 2021. Morphological identification of Nematodirus spathiger nematodes (Nematoda, Molineidae) obtained from the small intestine of sheep . Regulatory Mechanisms in Biosystems. 12, 1 (Mar. 2021), 121-127. DOI:https://doi.org/10.15421/022119.