Oesophagodontus robustus
(Giles, 1892) Railliet et Henry, 1902

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Synonyms: Sclerostoma robustum Giles, 1892; Pseudosclerostomum securiferum Quiel, 1919; Strongylus robustus (Giles, 1892) Popov, 1927.

General: With characteristics of the genus. Elements of ELC markedly less numerous than ILC and about same length. (18 against 34-48).

Male: Body length 15.0-20.0 mm. Esophagus length 0.927-1.7 mm. BC width 320-470, depth 220-320. Spicules length 620-765. Gubernaculum length 269-320. Dorsal ray length 328-367. Dermal collar well developed on ventral side of genital cone. Appendages of genital cone two pair thick fingershape protrusions.

Female: Body length 19.0-24.0 mm, length of esophagus 1.6-1.8 mm, width of BC 425-490, depth 323-450, distance from vulva to tail tip 2.2-3.5, from anus to tail tip 500-700, egg size 88-130 x 40-60.

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

Locality: cecum, colon.

Distribution: cosmopolitan.