Cyclocoelum leidyi, 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 : 15

C. leidyi Harrah, 1922

Syn. Cyclocoelum cuneatum Harrah, 1922

Type host. Wilson’s snipe, Gallinago delicata Ord ( Charadriiformes : Scolopacidae ).

This host is considered a subspecies of the common snipe, Gallinago gallinago (Linnaeus) (Syns. Capella gallinago Linnaeus , Gallinago wilsoni [Ord]) ( Charadriiformes : Scolopacidae ).

Locality. Westchester, Pennsylvania, USA.

Previously proposed synonyms. Cyclocoelum obscurum ( Leidy, 1887) —Tubangui (1923), Joyeux & Baer (1927), Witenberg (1928) and Dubois (1959); Monostomum mutabile Zeder, 1800 — Harrah (1922); Monostomum mutabile (= Cyclocoelum mutabile [ Zeder, 1800])— Bashkirova (1950).

Remarks. Leidy (1885) considered this species to be Monostomum mutabile (= C. mutabile ), and he did not describe it. Harrah (1922) provided a brief description of this species with illustrations and named it C. leidyi . Cyclocoelum cuneatum was originally described from specimen 0 8.172 of the Ward Collection at the University of Illinois; however, C. cuneatum cannot be distinguished from C. leidyi and is synonymized herein with the latter. Cyclocoelum cuneatum has a somewhat smaller ovary than C. leidyi (215–331 compared to 380–390 wide), but C. leidyi is larger (16,000–18,000 compared to 10,500–12,000 long) and the ovary in both species represents 2–3% of the body length. The difference in the size of the ovary is likely related to the size of the specimens. In addition to similarities in the measurements, C. leidyi and C. cuneatum both have a largely intertesticular uterus, the posteriormost uterine loops do not invade the posttesticular space and they are both from G. gallinago from North America. Both have a rudimentary oral sucker present—Harrah (1922).