C. nassatus (Looss, 1900) Foster, 1936

Figures

Synonyms: Cyathostomum nassatum Looss, 1900; Cylichnostomum nassatum (Looss, 1900) Looss, 1902; Cylicostomum nassatum (Looss, 1900) Gedoelst, 1903; Trichonema nassatum (Looss, 1900) LeRoux, 1924; LeRoux, 1924; Cylicocyclus bulbiferus Chaves, 1930

General: Posterior edge of MC situated at anterior edge of BC. Amphids projects above MC surface. Tip of submedian papillae spindle-shaped, about 4 times as long as thick. Stalk of submedian papillae shorter than broad. ELC markedly less numerous (19-20 against 56-62) 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 BC are straight. posterior ring of BC wall offset. Buccal cavity cylindrical. Dorsal gutter extends for one-half of depth of buccal cavity. Cuticular lining of BC with internal shelf-like projection Esophageal funnel swallow. Excretory pore posterior to NR. Anterior deirids near middle of glandular esophagus. Esophagointestinal valve not elongated.

Male: Body length 7.4-8.3 mm. Esophagus length 594-678. BC width 70-111, depth 30-38. Spicules length 1.15-1.27 mm. Gubernaculum length 156-189. Dorsal ray length 403-448. Ventral rays length equal to laterals. Dermal collar well developed on ventral side of genital cone. Appendages of genital cone large, oval with several short neepleshape protrusions, sometime fused medially.

Female: Body length 8.0-10.5 mm, length of esophagus 672-728, width of BC 108-165, depth 32-42, distance from vulva to tail tip 319-392, from anus to tail tip 190-274, egg size 87-95 x 40-48. Tail of mature females straight, tip slightly curved dorsally

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

Locality: cecum, colon.

Distribution: cosmopolitan.