Cylicostephanus calicatus (Looss, 1900) Cram, 1924

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Synonyms: Cyathostomum calicatum Looss, 1900; Cylichnostomum calicatum (Looss, 1900) Looss, 1902; Cylicostomum calicatum (Looss, 1900) Gedoelst, 1903; Trichonema calicatum (Looss, 1900) LeRoux, 1924; Erschowinema calicatum (Looss, 1900) Tshoijo, 1957; Cylicostomum barbatum Smit and Notosoediro, 1923; Trichonema tsengi K'ung and Yang, 1963.

General: Tip of submedian papillae bullet-shaped, 2 times as long as thick. ELC with12-18 elements; ILC with 26-42. Insertion for ELC on tips of elements of ILC. Tips of elements of ILC rounded. Insertion of ILC on anterior edge of BC. Septum intracoronare origin on support. Walls of BC straight, thicker posteriorly. Buccal cavity deeper than wide. Dorsal gutter elongate, more than 1/2 depth of BC. Anterior deirids and excretory pore 281-358 and 217 -358 from anterior end.

Male: Body length 5.1-7.1 mm. Esophagus length 289-356. BC width 30-36; depth 35-40. Spicule length 0.854-1.016 mm. Gubernaculum large, with dorsal handle & ventral notch; length 110-126. Dorsal ray length (from distal tip to origin of externodorsal ray) 400-0.502. Ventral rays shorter than laterals. Dermal collar well developed arround genital cone. Appendages of genital cone paired, separated, spherical formations with few protrusions that may be bifurcated.

Female: Body length 6.7-8.2 mm.Esophagus length 315-398. BC width 30-38; depth 36-43. Vagina length 320-400. Vulva to tail tip 160-228.Anus to tail tip 83-135. Egg size 57-69 x 37-45. Infundibulum length about equal to sphincter length. Tail of mature females conical straight, tip pointed; sublateral protrusions poorly developed.

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

Locality: cecum, colon.

Distribution: cosmopolitan.