@article{Yevstafieva_Yeresko_Pishchalenko_Nagorna_2018, title={Differential species characters of Baruscapillaria anseris and B. obsignata nematodes obtained from the domestic goose}, volume={9}, url={https://medicine.dp.ua/index.php/med/article/view/491}, DOI={10.15421/021886}, abstractNote={<p>The study presents species composition and abundance of nematodes of the family Capillariidae (Nematoda, Trichocephalida), parasitizing the domestic goose (<em>Anser anser</em> dom. Linnaeus, 1758) in Poltava region, Ukraine. Morphological specifics of adult specimens of collected helminths are examined and new data is obtained for species identification of Capillariidae considering their metric parameters. The pathogens of capillariasis in geese are represented by two species, <em>Baruscapillaria anseris</em> (Madsen, 1945) Moravec, 1982 and <em>B. obsignata</em> (Madsen, 1945) Moravec, 1982 with the former predominant. Prevalence of infection by <em>B. anseris</em> in domestic fowl was up to 46.8%, the abundance index reached 17.9 specimens. The proportion of geese infected with <em>B. obsignata</em> was 23.9%, and the abundance index was 3.8 specimens. Morphological study of the collected mature male and female nematodes revealed the significant similarity of both species in the general body structure and in identification characters: vulva and vagina structure in females, tail end, spicule and spicule sheath in males. Statistically significant differences were determined in the metric parameters of male and female <em>B. anseris</em> and <em>B. obsignata</em> nematodes. Those differences can be used to improve species identification. Males of <em>B. anseris</em> were larger than males of <em>B. obsignata</em> by 16 metric parameters including the length and width of body, spicule and spicule sheath, width of pseudobursa, and distance between the rays of pseudobursa. Females of <em>B. anseris</em> and <em>B.&nbsp;obsignata</em> were significantly different by seven metric parameters. By five parameters (length and width of various body regions) the <em>B. anseris</em> females were larger than <em>B. obsignata</em>. Metric parameters of the studied species are also of interest for taxonomic identification: the eggs of <em>B. obsignata</em> are longer and narrower than those of <em>B. anseris</em>.</p&gt;}, number={4}, journal={Regulatory Mechanisms in Biosystems}, author={YevstafievaV. А. and Yeresko, V. I. and PishchalenkoM. А. and Nagorna, L. V.}, year={2018}, month={Nov.}, pages={578-583} }