Poteriostomum ratzii (Kotlan, 1919) Ihle, 1920

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Synonyms: Cylicostomum ratzii Kotlan, 1919; Cylichnostomum ratzii (Kotlan, 1919) Yorke and Macfie, 1920; Craterostomum ratzii (Kotlan, 1919) Ostertag, 1932; Poteriostomum ratzii nanum Theiler, 1923.

General: With characteristics of the genus. Elements of ELC markedly shorter and more numerous than ILC (60-70 against 38-44). All elements of ILC equal length. Excretory pore and anterior deirids 500-600 from anterior end.

Male: Body length 10.5-13.5 mm. Esophagus length 0.700-0.793. BC width 158-194, depth 49-64. Spicules length 1.5-1.76 mm. Gubernaculum length 232-286. Dorsal ray length 430-690. Dermal collar well developed on both sides of genital cone. Appendages of genital cone undeveloped. Protrusions of dermal collar absent.

Female: Body length 14.5-20.0 mm, length of esophagus 714-816, width of BC 183-0.248, depth 051-0.073, distance from vulva to tail tip 1.5 -2.1 mm, from anus to tail tip — 0.637-1.050 mm. eggs size 95-115x50-57.

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

Locality: cecum, colon.

Distribution: cosmopolitan.

Discussion: Another species Poteriostomum skrjabini was found in horse and ass in Russia; distinguished by poorly defined dorsal gutter and short tail with vulva very close to the anus. It was listed as species inquirenda by Lichtenfels et al. (1997).