Cyathostomum montgomeryi
(Boulenger, 1920) K'ung, 1964

Figures

Synonyms: Cylicostomum montgomeryi Boulenger, 1920; Cylicostomum montgomeryi Boulenger, 1920; Cylicotoichus montgomeryi (Boulenger, 1920) Cram, 1924; Trichonema montgomeryi (Boulenger, 1920) Yorke and Maplestone, 1926; Erschowinema montgomeryi (Boulenger, 1920) Tshoijo, 1957.

General: ELC consisting of 18 slender pointed leaves. ILC consisting of 36 similar leaves at 1/2 of buccal capsule depth. Base of ILC located more deeply laterally than dorsoventrally. Buccal capsule characterized by peculiar bilateral symmetry, dorsal and ventral walls considerably longer than lateral walls; absence of radial symmetry making optical section of head in lateral view different from ventral view. Buccal cavity depth and width nearly equal in lateral view, but dorsoventrally, buccal capsule nearly twice as wide as deep. Junction of S and BC without narrow constriction. Support more developed on dorsal and ventral sides of buccal capsule; reaching to ½-2/3 of height of walls of buccal capsule.

Male: Body length 6.05-7.28 mm. Body width 258-315. Esophagus length 300-370. NR 138-229, excretory pore 256-321, anterior deirids 300-328 from anterior end. BC width 53-66, depth 33-44. Spicules length 540-642. Gubernaculum length 114-166. Dorsal ray length (from distal tip to origin of externodorsal ray) 261-400. Ventral rays length equal to laterals. Dermal collar poorly developed on ventral side of genital cone. Appendages of genital cone consisting of pair of hardly distinguishable oval protrusions. Protrusions of dermal collar absent.

Female: Body length 6.62-8.68 mm. Body width 284-442. Esophagus length 353-454. NR 187-240, excretory pore 240-334, anterior deirids 307-328 from anterior end. Width of BC 55-80, depth 34-47, distance from vulva to tail tip 180-252, from anus to tail tip 66-120.

Hosts: E. caballus, E. caballus x E. asinus, E. burchelli.

Locality: cecum, colon.

Distribution: Africa.

Notes for Discussion: The convex line of insertion of the ILC for C. montgomeryi, which is higher dorsally and ventrally, is different from the convex line of insertion in 3 other species ( C. tetracanthum, C. catinatum and C. alveatum) for which the line is higher laterally.