Nguyen H.M., Nguyen H.V., Tatonova Y.V.
В журнале Raffles Bulletin of Zoology
Год: 2020 Номер: 68 Страницы: 434–440
. This paper describes two new species of heteraxinid monogenean worms belonging to the rare and little-known genus Karavolicotyla, which were collected from two species of marine sciaenid fishes in Vietnam. Karavolicotyla tuyeti, new species, and K. ruber, new species, were found on the gills of Nibea albiflora and Otolithes ruber, respectively. Descriptions of the new species were based on morphology and morphometry. Both new species are characterised by having clamps on both sides of the haptor, arranged in two unequal rows; the cirrus and the genital atrium being armed; the dorsomedial vaginal opening located immediately distal to the level of the genital aperture, and the accessory vaginal opening being absent. Moreover, K. tuyeti, new species, can be separated from its congeners by the following characters: the number of clamps is 29 (29‒30) in the short row and 43 (40‒46) in the long row; the number of spines of the genital atrium is 52 (50‒56) and its length is 32 (28‒36) µm; the spherical cirrus with a single stout hook-like spine on top; and the number, size, and disposition of testes. Karavolicotyla ruber, new species, can be easily distinguished by the greater number of clamps (36, 50 in the short row and 69, 63 in the long row); the number of atrial spines (33, 34); the pine nut-shaped cirrus armed with a circlet of 14 short, strongly curved spines; and the number, size, and disposition of testes. An amendment to the morphological limits of the genus is proposed and its diagnostic characters are discussed.
