H. nittanyense (Zeliff, 1946)

Type host. Solitary sandpiper, Tringa solitaria Wilson ( Charadriiformes: Scolopacidae). Type locality. Nittany Mountain, Center County, Pennsylvania, USA.

Remarks. Although originally described as Cyclocoelum nittanyense Zeliff, 1946, this species was considered to be a synonym of Cyclocoelum brasilianum Stossich, 1902 (= Selfcoelum brasilianum ([Stossich, 1902] n. comb.) by Dubois (1959). It was transferred to Haematotrephus by Yamaguti (1958). Rudimentary oral sucker present— Zeliff (1946).