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Pseudopecoeloides lesteri Aken' Ova, Cribb & Bray 2009

Description

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Description (Figures 7-11): Based on 6 gravid, unflattened, laterally mounted worms from Pseudocaranx dentex and P. wrighti and 1 set of sagittal serial sections. Measurements are based on 3 gravid, unflattened, laterally mounted specimens from P. dentex; measurements of worms from P. wrighti are given in Table 3.
Body elongate, slender, subcylindrical; maximum width in region of gonads, 1,373-1,587 (1,482) × 158-170 (163); width to length ratio 1:8.5-10.0 (9.1). Oral sucker spherical to subspherical, opening nearly terminal, 85-95 (89) × 84-89 (86). Ventral sucker pedunculate, close to anterior end, larger than oral sucker, subspherical, 105-107 (106) × 119-125 (123); sucker width ratio 1:1.4-1.5 (1.4). Ventral sucker peduncle short, broad, 218-232 (225) × 132-158 (145), 14.6-15.9 (15.2) % of body length. Forebody relatively short, contains numerous gland cells, 261-323 (296) long, 19.0-21.7 (19.9) % of body length; peduncle to forebody length ratio 1:1.2-1.3 (1.3). Prepharynx distinct, short, feebly developed. Pharynx large, spherical to subspherical, 67-77 (72) × 76-77 (76); pharynx to oral sucker width ratio 1:1.1-1.2 (1.1). Oesophagus short, thin walled, surrounded by gland cells. Intestinal bifurcation dorsal to ventral sucker, 8-49 (28) posterior to anterior margin of ventral sucker peduncle. Caeca long, open into excretory vesicle close to posterior extremity to form uroproct (Figure 9).
Testes 2, entire, subspherical, usually separated, contiguous in one specimen, tandem, in posterior half of body; anterior 136-147 (141) × 94-125 (113); posterior 146-165 (159) × 104-129 (120). Post-testicular area 289-384 (325) long, 19.4-24.2 (21.9) % of body length. Cirrus-sac absent. Seminal vesicle long, tubular, narrow and convoluted anteriorly, large and vesicular posteriorly; posterior portion 100-107 (103) × 50-60 (55). Pars prostatica distinct, large, surrounded by gland cells. Ejaculatory duct thick-walled, with distinct sphincter at anterior extremity (see Figure 8), surrounded by gland cells. Genital atrium small. Genital pore antero-sinistral to intestinal bifurcation, close to anterior extremity, 124-133 (129) from anterior end, 8.4-9.0 (8.7) % of body length.
Ovary pre-testicular, entire, usually contiguous with anterior testis, separate in 1 specimen, spherical to subspherical, 71-77 (74) × 67-73 (69). Mehlis’ gland distinct, anterior to antero-dorsal to ovary. Uterine seminal receptacle present. Laurer’s canal present, thick-walled, opens dorso-sinistrally to ovary, at about level of its anterior margin. Metraterm distinct, thick-walled, with distinct sphincter at anterior extremity, surrounded by gland cells; thick-walled muscular structure appears to enclose anterior extremities of ejaculatory duct and metraterm (Figure 8). Eggs relatively large, operculate, 64-75 (69) × 27-44 (34). Vitelline follicles restricted to hindbody, extend from 499-623 (553) from anterior extremity, 33.8-41.9 (37.3) % of body length, to 26-40(35) from posterior extremity; fi elds confluent dorsally and ventrally in post-testicular area, dorsally or not between posterior margin of posterior testis and anterior limit with interruptions in areas around gonads, separate ventrally, with follicles lying lateral, ventral and dorsal to caeca; anterior limit slightly posterior to posterior margin of seminal vesicle.
Excretory pore terminal. Excretory vesicle I-shaped, long; posterior extremity forms short narrow duct surrounded by gland cells; vesicle reaches to ovary
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bibliographic citation
Pseudopecoeloides Yamaguti, 1940 (Digenea, Opecoelidae) from temperate marine fi shes of Australia.
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Distribution

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Type-host: Pseudocaranx dentex (Bloch et Schneider)(Carangidae: Perciformes), white trevally. Other host: Pseudocaranx wrighti (Whitley) (Carangidae: Perciformes), skipjack trevally. Type-locality: Off Kingscote, Kangaroo Island, South Australia, 35°40’S, 137°39’E, December 1995. Other locality: Off North Mole, Fremantle, Western Australia, 32°03’S, 115°43’E, December 1994. Site: Intestine. Material studied: Ex Pseudocaranx dentex: 4 off Kingscote; ex Pseudocaranx wrighti: 2 off North Mole. Holotype: Queensland Museum, Reg. No. QM G230452, paratypes: Queensland Museum, Reg. Nos QM G230453-4, BMNH Reg. No 2008.12.9.7-8.
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