Selfcoelum limnodromi, Dronen, Norman O., Gardner, Scott L. & Jiménez, F. Agustín, 2006

Dronen, Norman O., Gardner, Scott L. & Jiménez, F. Agustín, 2006, Selfcoelum limnodromi n. gen., n. sp. (Digenea: Cyclocoelidae: Cyclocoelinae) from the long­billed dowitcher, Limnodromus scolopaceus (Charadriiformes: Scolopacidae) from Oklahoma, U. S. A., Zootaxa 1131, pp. 49-58 : 52-53

Selfcoelum limnodromi n. sp. ( Figs. 1–3 )

Type host: Limnodromus scolopaeus (Say, 1823) , Charadriiformes , Scolopacidae , longbilled dowitcher.

Type­locality: The Cheyenne bottoms, Oklahoma, 35° 42’ N latitude, 94° 42’ W longitude.

Site: Air sacs.

Deposited specimens: HWML holotype 48162, HWML paratypes 48163, HWML vouchers specimens 41212.

Etymology: The genus is named after Dr. J. Teague Self in recognition of his many contributions to our knowledge of the endohelminth parasites of the birds of North America. The species designation comes from the genus of the bird from which these specimens were collected, Limnodromus Wied, 1833 .

Description: Based on 11 specimens. With characteristics of the genus. Body large, markedly tapered anteriorly, 9.2 (8.5–9.6) mm long by 2.5 (2.3–3.1) mm wide at widest point. Oral sucker and acetabulum absent. Mouth slightly subterminal; prepharynx 185 (140–200) long; pharynx well developed, 195 (180–210) long by 195 (190–200) wide; esophagus longer than prepharynx, 410 (400–430) long. Ceca simple, long, uniting near posterior extremity to form cyclocoel. Testes smooth, spherical to subspherical, arranged diagonally near posterior extremity in intercecal region. Anterior testis 435 (400–480) long by 485 (420–600) wide. Posterior testis 575 (530–580) long by 535 (500–600) wide. Posttesticular space 690 (550–820) or approximately 8% of body length. Cirrus sac 590 (500–700) long by 175 (170–190) wide. Genital pore situated on ventral surface of body immediately posterior to posterior margin of the pharynx, near midline of body, located at the level of the posterior fourth of pharynx in a few specimens. Ovary smooth, oval, situated intertesticularly to nearly opposite posterior testis in some specimens, forming a triangle with testes, 290 (250–340) long by 280 (230–370) wide. Seminal receptacle located immediately posterior and somewhat dextral to ovary, 255 (104–400) long by 230 (120–330) wide. Ootype immediately posterior to ovary, overlapping the left margin of seminal receptacle. Laurer’s canal absent. Vitelline follicles small, delicate in appearance, distributed along ceca from level of cecal bifurcation to posterior extremity, vitelline fields not confluent posteriorly. Uterus containing few eggs (approximately 200–500), intercecal in anterior third of body becoming widely extracecal in posterior region where loops approach lateral margins of body. Eggs 140 (135–151) long (n=20) by 79 (75–85) wide; miracidia nonoculate. Excretory vesicle simple, anterior extent not observed. Excretory pore terminal.

Figures

FIGURES 1 – 3. Selfcoelum limnodromi n. gen., n. sp. from the long­billed dowitcher, Limnodromus scolopaceus. 1. Ventral view of adult. 2. Composite drawing of anterior end showing placement of the genital pore and terminal genitalia, ventral view. 3. Composite drawing of female genitalia, dorsal view. Abbreviations: C, cecum; O, ovary; S, seminal vesicle; T, testis; U, uterus; V, vitelline follicles. Scale bars: 1, 2,050 µm; 2, 550 µm; 3, 1,200 µm.