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

Dronen, Norman O., Gardner, Scott L. & Jiménez, F. Agustín, 2006, Haematotrephus limnodromi n. sp. (Digenea: Cyclocoelidae) from the Long­billed dowitcher, Limnodromus scolopaceus (Scolopacidae) from the central flyway of North America, Zootaxa 1153, pp. 51-61 : 56-58

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

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

Type locality: Cheyenne Bottoms, Roger Mills County, Oklahoma, U.S.A., 35° 42’ N latitude, 99° 42’ W longitude.

Site of infection: Air sacs of lungs.

Deposited specimens: Holotype HWML 48259; paratypes (2 specimens) 48260; vouchers (2 specimens) 48261.

Etymology

The species designation reflects the genus of the long­billed dowitcher from which specimens were collected, Limnodromus Wied, 1833 .

Description

Based on 5 specimens (4 entire adult specimens and 1 broken adult specimen). With characteristics of the genus. Body large, tapered anteriorly, 14.6 (12.0–16.0)mm long by 3.9 (3.8–4.0)mm wide at widest point (n=4). Oral sucker and acetabulum absent. Mouth slightly subterminal; prepharynx (measured as the distance from the opening of the mouth to the anterior margin of the pharynx) 85 (60–110) long; pharynx well developed, 220 (200–250) long by 210 (190–240) wide; esophagus approximately 5 times longer than prepharynx (measured as actual length), 413 (370–450) long. Ceca simple, uniting near posterior extremity to form cyclocoel. Genital pore immediately postpharyngeal near midline of body. Testes smooth, spherical to subspherical, diagonal, located in intercecal region in the posterior sixth of body. Anterior testis in anterior aspect of posterior sixth of body, overlapping cecum, wider than long, 1,100 (870–1,200) long by 1,300 (1,020–1,460) wide. Posterior testis located near posterior extremity of body, overlapping cecum posteriorly, wider than long 1,250 (950–1,410) long by 1,425 (1,100–1,600) wide. Cirrus sac 670 (620–750; approximately 5% of body length) long by 230 (220–250) wide.

Ovary smooth, oval, slightly pretesticular to directly opposite the anterior testis in some specimens, forming a triangle with testes, 420 (410–440) long by 410 (350–450) wide. Posttesticular space 525 (430–710 long; approximately 4% of body length). Typical seminal receptacle absent. Laurer’s canal absent. Ootype elliptical, located somewhat dextral and immediately posterior to ovary with anterior fourth overlapping posterior third of ovary, approximately 775 long by 475 wide. Vitelline follicles distributed along ceca from level of cecal bifurcation to near posterior extremity, not confluent posteriorly. Uterus extensive, with extracecal loops common throughout body length, intertesticular loops present, proximal fourth filled with sperm, receptacle seminalis uterinum of Harrah (1922) immediately sinistral to posterior end of ootype. Eggs in anterior­most loops of uterus, 155 (150–165) long by 76 (65–80) wide (n=30). Miracidia oculate. Excretory vesicle simple, anterior extent not visible. Excretory pore terminal.

Figures

FIGURES 1 – 3. Haematotrephus limnodromi 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: O, oötype; OV, Ovary; S, uterine seminal receptacle; U, uterus; V, Seminal vesicle. Scale bars: 1, 3,100 µm; 2, 630 µm; 3, 510 µm.