Selfcoelum allahabadi, Khan, 1935

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 : 18-19

S. allahabadi ( Khan, 1935) n. comb.

Syns. Cyclocoelum agamprasadi Jain, 1983 ; Cyclocoelum erythropis Khan, 1935 ; Cyclocoelum indicum Khan, 1935

Type host. Spotted redshank, Tringa erythropus (Pallas) (Syn. Totanus fuscus Linnaeus ) ( Charadriiformes : Scolopacidae ).

Type locality. Allahabad (also known as Prayag), Allahabad District, India.

Additional hosts. Common sandpiper, Actitis hypoleucos (Linnaeus) (Syn. Tringa hypoleucos Linnaeus ); common greenshank, Tringa nebularia (Gunnerus) (Syn. Glottis nebularia Gunnerus ) ( Charadriiformes : Scolopacidae )— Jain (1983); Khan (1935).

Additional locality. Agra District, Uttar Pradesh, India—Jain (1983).

Previously proposed synonyms. Cyclocoelum turusigi Yamaguti, 1939 (= Selfcoelum turusigi [ Yamaguti, 1939] n. comb.)— Bashkirova (1950); Cyclocoelum (Cyclocoelum) allahabadi Khan, 1935 — Bashkirova (1950). Remarks. This species was originally described as Cyclocoelum allahabadi Khan, 1935 . Cyclocoelum agamprasadi (= Selfcoelum agamprasadi [ Jain, 1983] n. comb.) was originally described from A. hypoleucos from the Agra District, Uttar Pradesh, India; however, S. agamprasadi n. comb. cannot be distinguished from S. allahabadi ( Khan, 1935) n. comb., and we agree with Bashkirova (1950) that S. agamprasadi n. comb. should be synonymized with the latter. Selfcoelum agamprasadi n. comb. has a somewhat larger oral sucker than S. allahabadi n. comb. (250 wide compared to 200); however, S. agamprasadi n. comb. is larger (19,000 long compared to 17,000) and the oral sucker represents virtually the same percentage of the body length in both species (1.3% compared to 1.2%), suggesting the difference in the width of the oral sucker is a product of growth. Similarly, S. agamprasadi n. comb. has a slightly longer intertesticular space (1,580 as calculated from Fig. 2 of the original description [given as 3,000 in the original description] compared to 870), but again the length of the intertesticular space relative to body length is similar in both species (8% compared to 5%, respectively). Cyclocoelum erythropis (= S. erythropis [ Khan, 1935] n. comb.) was originally described from Tringa erythropus from Allahabad, Allahabad District, India. Selfcoelum erythropis n. comb. has a generally shorter body (7,500– 17,000), a slightly narrower pharynx (150–250 compared to 280), and a somewhat larger intertesticular space (1,200–1,500, 8% of body length compared to 870, 5% of body length), but these differences are well within the normal variability seen in the cyclocoelids and in most other flukes. It also has a shorter cirrus sac (750, 3–4% of body length compared to 600, about 4%), but the similar percentages relative to body length suggest that this difference is a product of growth. Cyclocoelum indicum (= S. indicum [ Khan, 1935] n. comb.) was originally described from Tringa nebularia from Allahabad, Allahabad District, India. Selfcoelum indicum n. comb. has a longer body (20,000–27,000), a somewhat longer cirrus sac (750, 3–4% of body length), a longer intertesticular space (2,200, about 8% of body length), and a longer posttesticular space (850, about 3% of body length compared to 310, 2%), but these differences are within the normal variability seen in the cyclocoelids and are likely a product of comparing different sized adults (growth). All the species proposed above as synonyms of S. allahabadi n. comb. have egg sizes that are within 100–120 by 60–80, and in addition to the measurements, they have uterine loops that surpass the ceca laterally, posterior-most uterine loops that do not invade the posttesticular space, a rudimentary oral sucker and all are from scolopacid birds (primarily species of Tringa Linnaeus ) from India.

Figures

FIGURES 1 – 4. Diagrammatic representations of species representing the genera assigned to Cyclocoelinae Stossich, 1902. 1. Cyclocoelum Brandes, 1892 represented by Cyclocoelum mutabile (Zeder, 1800), adapted from Kossack (1911); 2. Selfcoelum Dronen, Gardner, & Jiménez, 2006 represented by Selfcoelum limnodromi Dronen, Gardner, & Jiménez, 2006, adapted from Dronen et al. (2006 a); 3. Psophiatrema Dronen & Kinsella, 2009 represented by Psophiatrema greineri Dronen & Kinsella, 2009, adapted from Dronen & Kinsella (2009); 4. Circumvitellatrema Dronen, Greiner, Ialeggio & Nolan, 2009 represented by Circumvitellatrema momota Dronen, Greiner, Ialeggio & Nolan, 2009, adapted from Dronen et al. (2009). Abbreviations: C, cecum; G, genital pore; O, ovary; P, pharynx; S, rudimentary oral sucker; T, testis; U, uterus; V, vitelline field.