Lytocestidae Wardle et McLeod, 1952 »
Lytocestinae Satpute et Agarwal, 1980 »
Lytocestus Cohn, 1908 »
Lytocestus longicollis, Rama Devi 1973
Body long, slender, ribbon like, 8.58-22.44 mm in length, 0.66-2.31 mm in maximum breadth at level of cirrus sac; body proper divided into an outer cortex and an inner medulla by two distinct layers of parenchymal longitudinal muscles. Scolex un-differentiated, un-armed, but may vary in shape from spatulate or oblong in relaxed specimens to swollen and pear shaped in contracted ones. Neck long, slender, occupying one-third of the body length. Testes numerous, 213-520 in number, occupying the medullary region of the body, spherical in shape, extending from anterior narrow end of the body to the cirrus-sac posteriorly; cirrus sac oval, lined by thin muscular wall, enclosing the long ductus ejaculatorious that opens separately from the utero-vaginal pore. Ovary bilobed, follicular, H-shaped, connected by band-like ovarian isthmus, corticular in disposition; Mehlis' gland situated posterior to isthmus in between the two ovarian lobes, uterine coils glandular, extending from behind ovarian isthmus to the level of cirrus pore beyond the anterior horns of ovary; vagina straight or slightly convoluted, opening unitedly with the uterus as utero-vaginal pore; receptaculum seminis a conspicuous sac, oval in shape, lying anterior to ovarian isthmus. Vitellaria cortical, in a ring around the testes, lobular, smaller than testes, extending from a few millimeters anterior to the testes up to the cirrus sac, no post-ovarian vitelline follicles present. Excretory pore terminal. Eggs oval in shape, smooth, operculate, 0.03-0.05 x 0.02-0.03 mm.
L. longicollis was originally described by Rama Devi (1973) from Clarias batrachus in Visakhapatnam district of Andhra Pradesh. The species was distinguished from the rest of the lytocestiid types in having a receptaculum seminis, which is absent in the other species. The species derived its name from its long neck.
NEHU/Z - CF/8
Rama Devi, P. (1973). Lytocestus longicollis sp. nov. (Cestoidea: Caryyophyllidea) from the catfish Clarias batrachus (L.) in India. Journal of Helminthology. 47:pp 415-420.