Parapoteriostomum mettami
(Leiper, 1913) Hartwich, 1986

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Synonyms: Cylicostoma mettami Leiper, 1913; Cylicostomum mettami (Leiper, 1913) Ransom and Hadwen, 1918; Trichonema mettami (Leiper, 1913) LeRoux, 1924; Cylicocercus mettami (Leiper, 1913) Cram, 1924; Cylicostomum ihlei Kotlan, 1921; Cylicodontophorus mettami (Leiper, 1913) Foster, 1936.

General: Large-sized Cyathostominea. Posterior edge of MC posterior to edge of BC. ELC elements markedly more numerous (60) than ILC elements(40-46). ILC elements less than twice as long as ELC elements. Insertion point for posterior ends of elements of ILC about 1/4 of BC depth dorsally and ventrally; slightly less laterally. Dorsal gutter button-like. Esophageal funnel well developed.

Male: Body length 9.9-10.6 mm. Esophagus length 545-574. BC width 98-117, depth 46-59. Distance from anterior deirids and excretory pore to head end 502-574, spicules length 1.95-2.3 mm, Gubernaculum length— 234-258, length of dorsal ray 443-473. Dermal collar undeveloped. Appendages of genital cone — pair small fingershape protrusions. Protrusions of dermal collar absent.

Female: Body length 12.7-16.2 mm, length of esophagus 631-717, width of BC 130-143, depth 46-59, Distance from anterior deirids and excretory pore to head end 574-688, vagina length 800. Distance from vulva to tail tip 375-470, from anus to tail tip — 250-300. eggs size 124-128x60-62.

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

Locality: cecum, colon.

Distribution: cosmopolitan.