C. leptostomum (Kotlán, 1920) Foster, 1936

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Synonyms: Cylicostomum leptostomum Kotlan, 1920; Trichonema leptostomum (Kotlan, 1920) LeRoux, 1924; Schulzitrichonema leptostomum (Kotlan, 1920) Ershov, 1943; Cylicotetrapedon leptostomum (Kotlan, 1920) K'ung, 1964; Cyathostomum bogoriense Smit and Notosoediro, 1923.

General: Posterior edge of MC situated at anterior edge of BC. Amphids projects above MC surface. Tip of submedian papillae bullet-shaped, 2-3 times as long as thick. Stalk of submedian papillae longer than broad. ELC markedly less numerous (20-24 against 50-60) and longer than ILC. Elements of ELC longer than broad. Tips of elements of ILC rounded. Insertion point for posterior ends of elements of ILC on anterior edge of buccal capsule. Walls of BC thickens gradually toward base without marked offset of ring. Buccal cavity cylindrical. Dorsal gutter button-like but distinct. Esophageal funnel small, with thin cuticular lining. Excretory pore posterior to NR. Anterior deirids near middle of glandular esophagus. Esophagointestinal valve elongated.

Male: Body length 5.9-6.3 mm. Esophagus length 480-548. BC width 40-44, depth 20-32. Spicules length 1.0-1.2 mm. Gubernaculum length 140-168. Dorsal ray length 360-440. Ventral rays length equal to laterals. Bursa edge smooth. Genital cone slightly project beside bursa. Dermal collar poore developed on ventral side of genital cone. Appendages of genital cone oval with numerous fingershape protrusions

Female: Body length 6-8 mm, length of esophagus 520-650, width of BC 44-60, depth 20- 24, distance from vulva to tail tip 220-304, from anus to tail tip 100-156, egg size 58-100x38-40.

Hosts: Equus caballus, E. asinus,E. caballus X E. asinus, E. przewalskii, E. hemionus, E. burchelli

Locality: cecum, colon.

Distribution: cosmopolitan.