Selfcoelum lahillei Dollfus, 1948

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 : 22

S. lahillei ( Dollfus, 1948) n. comb.

Type host. Red-gartered coot, Fulica armillata Vieillot ( Gruiformes : Rallidae ).

Type locality. Parana Delta, Parana River, Argentina—Thatcher (1993).

Remarks. Lahille (1918) considered this species to be C. mutabile ( Zeder, 1800) and provided a minimal illustration but did not describe this species beyond a body length and individual egg size. Dollfus (1948) also did not describe this species, but renamed Monostoma mutabile of Lahille (1918) as Cyclocoelum lahillei ( Dollfus, 1948) distinguishing it from C. mutabile based on the “grandes dimensions” of the pharynx and the postpharyngeal placement of the genital pore in C. lahillei . Dubois (1959) considered C. lahillei to be a synonym of C. mutabile . This species has a postpharyngeal genital pore and the vitelline fields are not confluent posteriorly, placing it in Selfcoelum . The anterior end of the specimen illustrated in Fig. 1 of the original description by Lahille (1918) appears to show the placement of the pharynx immediately above the intestinal bifurcation and an unusually short esophagus, suggesting that the anterior end is quite contracted, whereas in less contracted specimens, the genital pore likely would appear more posterior relative to the mid-level of the pharynx. No oral or ventral sucker described—Lahille (1918).

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.