Morphometric Analysis of Сapillaria anatis (Nematoda, Capillariidae) from Anas platyrhynchos domesticus

Abstract

The study presents species-specific morphological traits and metric parameters of mature male and female Сapillaria anatis (Nematoda, Capillariidae) nematodes. The capillariids were obtained by examinations of caeca of 205 domestic ducks (Anas platyrhynchos dom.), reared at poultry farms of Poltava, Sumy and Kyiv Regions of Ukraine. Noted sexual dimorphism was significant by seven morphometric parameters, with measurements of females being larger by 12.40–29.69 % than those of males. In addition to species-specific traits, other diagnostic characters were proposed in male and female С. anatis. In males, such taxonomically important features are morphological specifics of pseudobursa, spicule and ornamentation of spicule sheath. In identification of females, morphology of the vulvar area and eggs in uterus should be considered. Eleven metric parameters are suggested for better differential diagnostics of С. anatis.

A new nematode of the family Capillariidae identified in Cairina moschata (Linnaeus) on Marajó Island in the Brazilian Amazon

“…All female specimens in our study were morphologically similar to C. pudendotecta described by Oyarzún-Ruiz et al ( 2019), with a small vulvar appendix. However, they could be easily distinguished from C. anatis and C. spinulosa described by Baruš et al (1981), Tanveer et al (2015), andYevstafieva et al (2020). They identified females without a vulvar appendix, and Mettrick (1959) and Sakaguchi et al (2020) reported that C. spinulosa females had a vulva without a vulvar appendix.…”

“…anatis and C . spinulosa described by Baruš et al (1981) , Tanveer et al (2015) , and Yevstafieva et al (2020) . They identified females without a vulvar appendix, and Mettrick (1959) and Sakaguchi et al (2020) reported that C .…”

“…The morphometric comparisons with other capillariids that parasitize the large intestine and ceca of birds are described in Table 2 . Yevstafieva et al (2020) reported specific morphological characteristics and biometric parameters of male and female С . anatis observed in A. platyrhynchos raised on poultry farms in Ukraine.…”

“…The morphometric comparisons with other capillariids that parasitize the large intestine and ceca of birds are described in Table 2. Yevstafieva et al (2020) reported specific morphological characteristics and biometric parameters of male and female С. anatis observed in A. platyrhynchos raised on poultry farms in Ukraine. As reported by Moravec (1982Moravec ( , 2001b and Melnychuk et al (2020), males have characteristics such as a pseudobursa, spicules, and spicular sheath ornamentation, and in females, the morphology of the vulvar area and eggs in the uterus should be considered.…”