S. equinus Müller, 1784

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Synonyms: Strongylus equorum Zeder, 1800; Strongylus armatus Rudolphi, 1802, in part; Strongylus neglectus Poeppel, 1897; Sclerostoma equinum (Mueller, 1780) Blainville, 1828; Sclerostomum quadridentatum Sticker, 1901, not Dujardin, 1845.

General:. ELC less numerous and longer than ILC (40-56 against 42-80). Dorsal and ventral teeth present in buccal cavity; dorsal tooth single with 2 points; 2 ventral teeth pointed and shorter than dorsal tooth.

Male: Body length 24-36 mm. Esophagus length 1.80-1.98 mm. BC width 0.88-0.99 mm, depth 1,02-1,23 mm. Spicules length 2.75-3.18 mm. Gubernaculum length 328-431. Dorsal ray length 475-497. Dermal collar well developed on ventral side of genital cone. Appendages of genital cone inconstant. Studied specimens have two fingerlike protrusions. Protrusions of dermal collar absent.

Female: Body length 39-46 mm, length of esophagus 1.9-2.5 mm, width of BC 1.11-1,26, depth 1.12-1.42, distance from vulva to tail tip 11,5-14,5, from anus to tail tip 1,03-1, 90, egg size 71-90 x 42-55.

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

Locality: cecum, colon.

Distribution: cosmopolitan.