Cylicostephanus hybridus
(Kotlan, 1920) Cram, 1924

Figures

Synonyms: Cylicostomum hybridum Kotlan, 1920; Trichonema hybridum (Kotlan, 1920) Le-Roux, 1924; Erschowinema hybridum (Kotlan, 1920) Tshoijo, 1957; Schulzitrichonema hybridum (Kotlan, 1920) Barus, 1963

General: Tip of submedian papillae spindle-shaped, 3-4 times as long as thick. ELC with14-16 elements; ILC with 30-34. Insertion for ELC on tips of elements of ILC. Tips of elements of ILC rounded. Insertion for ILC on anterior edge of BC. Septum intracoronare origin placed on support. Walls BC are straight, thicker posteriorly. Buccal cavity wider than deep. Dorsal gutter elongate, more than 1/2 depth of BC. Anterior deirids and excretory pore 330-430 from anterior end.

Male: Body length 6.6-8.5 mm. Esophagus length 320-412. BC width 36-40; depth 24-32. Spicule length 1.04-1.12 mm. Gubernaculum large, with dorsal handle & ventral notch; length 152-172. Dorsal ray length 260-358. Ventral rays shorter than laterals. Dermal collar well developed on ventral side of genital cone. Appendages of genital cone paired, ovoid-shaped bodies connected medially, without any protrusions. Protrusions of dermal collar absent.

Female: Body length 8.2-9.2 mm. Esophagus length 400-475. BC width 28-32; depth 28-32. Vulva to tail tip 180-200. Anus to tail tip 94-116. Egg size 88-96 x 47-50. Infundibulum longer than sphincter. Tail conical; sublateral protrusions poorly developed.

Hosts: Equus caballus, E. asinus, E. przewalskii.

Locality: cecum, colon.

Distribution: Asia, Europe, North America.