Cyclocoelum wilsoni, Harrah, 1922

Dronen, Norman O. & Blend, Charles K., 2015, Updated keys to the genera in the subfamilies of Cyclocoelidae Stossich, 1902, including a reconsideration of species assignments, species keys and the proposal of a new genus in Szidatitreminae Dronen, 2007, Zootaxa 4053 (1), pp. 1-100 : 50

W. wilsoni ( Harrah, 1922)

Type host. Common snipe, Gallinago gallinago (Linnaeus) (given as Gallinago wilsoni Seebohm; not a valid species) ( Charadriiformes : Scolopacidae ).

Type locality. Creston, Iowa, USA.

Additional host. Western sandpiper, Calidris mauri Cabanis (Syn. Ereunetes mauri Cabanis ) ( Charadriiformes : Scolopacidae )— Yamaguti (1971).

Additional locality. Oklahoma, USA—Yamaguti (1971).

Remarks. This species was originally described as Cyclocoelum wilsoni Harrah, 1922 but considered to be a synonym of W. triangulare ( Harrah, 1922) by Bashkirova (1950), of Cyclocoelum (H.) tringae Stossich, 1902 (= Neohaematotrephus tringae [ Stossich, 1902] n. comb.) by Dubois (1959) and of H. lanceolatum ( Wedl, 1858) by Macko & Feige (1960). This species has a pretesticular ovary that forms a triangle with the testes (Haematotrephinae), a postpharyngeal genital pore, the vitelline fields are not confluent posteriorly and the testes are side by side or nearly so, placing it in Wardianum . Rudimentary oral sucker present—Harrah (1922).