Pseudopecoeloides atherinomori Aken'Ova &amp; Cribb &amp; Bray 2009
Creators: name: Aken'Ova, Thelma
name: Cribb, Thomas
name: Bray, Rodney
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Trematoda
Plagiorchiida
Opecoelidae
Pseudopecoeloides
Pseudopecoeloides atherinomori

description: <i>Pseudopecoeloides atherinomori</i> Aken’Ova, Cribb &amp; Bray, sp. n. urn:lsid:zoobank.org:act: F5CF0AD3-5D8E-4C2B-BD09-FBF75D31088B <b>Type-host:</b> <i>Atherinomorus ogilbyi</i> (Whitley) (Atherinidae, Atheriniformes), Ogilby’s hardyhead. <b>Type-locality:</b> Moreton Bay, South-East Queensland, 27°20′S, 153°07′E, March 1989. <b>Other localities:</b> Off Dunwich, Stradbroke Island; 27°30′S, 153°24'E, January and November 1994; Off Bribie Island, South-East Queensland 27°00′S, 153°05′E. <b>Site:</b> Intestine. <b>Material studied:</b> Ex <i>Atherinomorus ogilbyi</i>: 6 from Moreton Bay; 2 from off Dunwich, Stradbroke Island, (one of the specimens was unmounted and sectioned after measuring); 1 from off Bribie Island from a pooled gut-wash. <b>Type-material:</b> Holotype: Queensland Museum, Reg. No. QM G 230489, paratypes: Queensland Museum, Reg. Nos. QM G 230490 - 230494, BMNH Reg. Nos 2008.12.9.28-29. <b>Description</b> (Figures 15-18): Based on 6 gravid, 2 immature laterally mounted specimens, 1 dorso-ventrally mounted specimen and 1 set of sagittal serial sections. Measurements are of 6 gravid, unflattened, laterally mounted worms. Body elongate, slender, subcylindrical; maximum width in region of gonads, 1,312 -2,155 (1,677) × 146-194 (176); width to length ratio 1:7.5-12.1 (9.6). Oral sucker ventrally subterminal to nearly terminal, spherical to subspherical, 84-130 (106) × 84-120 (104). Ventral sucker larger than oral sucker, spherical to subspherical, on very short peduncle; peduncle forms wrinkles around ventral sucker in dorsoventrally mounted worm, 117-175 (142) × 117-149 (134); sucker width ratio 1:1.2- 1.4 (1.3). Forebody relatively short, contains numerous large and small gland cells, 214-292 (258) long, 13.3-20.7 (15.8) % of body length. Prepharynx distinct, short. Pharynx large, subspherical, with numerous gland cells along posterior margin, 62-84 (70) × 71-100 (85); pharynx to oral sucker width ratio 1:1.2-1.4 (1.2). Oesophagus moderately long, surrounded by gland cells. Intestinal bifurcation, dorsal to ventral sucker, 13-48 (32) posterior to anterior margin of ventral sucker. Caeca long, open into excretory vesicle close to posterior extremity to form uroproct. Testes 2, entire, elongate-oval, usually separate, occasionally contiguous (n=1), tandem, in posterior half of body; anterior 91-188 (142) × 61-143 (101); posterior 97- 240 (162) × 71-123 (102). Post-testicular area 233-810 (431) long, 17.8-37.6 (25.0) % of body length. Cirrus-sac absent. Seminal vesicle naked, long, tubular, sinuous to convoluted at anterior end, elongate and saccular at posterior end, extends from region of intestinal bifurcation to point posterior to ventral sucker. Pars prostatica distinct, surrounded by gland cells. Ejaculatory duct moderately long, thick-walled, surrounded by gland cells. Genital atrium doliiform, thick-walled. Genital pore sinistrally submedian, anterior to intestinal bifurcation, level with or slightly anterior to anterior margin of pharynx, 96-144 (121) from anterior end, 5.9-9.9 (7.3) % of body length. Ovary pre-testicular, entire, subspherical, 75-143 (100) × 65-113 (85). Mehlis’ gland distinct, antero-dorsal to ovary. Uterine seminal receptacle present. Laurer’s canal distinct, long, convoluted, thick-walled, opens at point dorso-sinistral to ovary. Uterus coils between anterior margin of ovary and region of posterior margin of ventral sucker, runs without coiling alongside anterior portion of seminal vesicle to unite with ejaculatory duct close to genital pore. Metraterm distinct. Eggs large, oval, operculate, 52-72 (62) × 26-46 (37). Vitelline follicles extend from 318-459 (389) from anterior extremity, 19.6-31.5 (23.7) % of body length, to 13-39 (28) from posterior extremity; fields confined to hindbody extending from about level of posterior margin of ventral sucker almost to posterior extremity, confluent dorsally and ventrally in post-testicular area, with follicles lateral, ventral, and dorsal to caeca. Excretory pore terminal. Excretory vesicle I-shaped; narrow terminal portion surrounded by gland cells; vesicle widens and passes anteriorly to terminate at about mid-body. <b>Etymology:</b> The species name is derived from <i>Atherinomorus</i> Fowler, 1903 the host genus. <b>Comments:</b> The nature of the caecal ends in this species is very difficult to discern. The caeca appear to terminate blindly in the single dorso-ventrally mounted specimen, whereas they clearly open into the excretory vesicle in one of the eight laterally mounted specimens. Madhavi (1975) and Bray (1987) also had trouble in determining the relationship between the caeca and the excretory vesicle in a related species. This is discussed in the footnote attached to <i>P. scomberi</i>. Although Bray (1987) suggested that sectioning would solve the problem, it did not do so in the present material. However, we have concluded that the present species has a uroproct, based on observations on the single laterally mounted specimen (Figure 18). <i>Pseudopecoeloides atherinomori</i> sp. n. can be accommodated in Group B (Table 2): <i>P. akule</i> has a smaller ventral sucker and pharynx relative to the oral sucker. <i>P. scomberi</i> is slightly more elongate, with a width to length ratio of 1:12.8 versus 1:7.5-12.1 (9.6); it also has a smaller ventral sucker and pharynx relative to the oral sucker and a shorter forebody relative to the body length (Table 2). <i>P. atherinomori</i> sp. n. resembles <i>P. lesteri</i> sp. n. in most metrical features but can be distinguished from the latter by its shorter forebody and slightly longer post-testicular area relative to the body length. Furthermore, the anterior limit of the vitelline follicles in <i>P. atherinomori</i> is about level with the posterior margin of the ventral sucker peduncle, whereas it is about half-way between the anterior margin of the ovary and the posterior margin of the ventral sucker peduncle in <i>P. lesteri</i> sp. n. <i>P. atherinomori</i> sp. n. also resembles <i>P. carangis</i> in its vitelline distribution and in some metrical features, but the latter has a smaller ventral sucker and a smaller pharynx relative to the oral sucker.
description: Published as part of <i>Aken'Ova, Thelma, Cribb, Thomas &amp; Bray, Rodney, 2009, Seven species of Pseudopecoeloides Yamaguti, 1940 (Digenea, Opecoelidae) from temperate marine fishes of Australia, including five new species, pp. 1-32 in ZooKeys 5 (5)</i> on pages 22-24, DOI: 10.3897/zookeys.5.54, http://zenodo.org/record/576427
description: {"references": ["Madhavi R (1975) Digenetic trematodes from marine fishes of Waltair Coast, Bay of Bengal. Family Opecoelidae. Rivista di Parassitologia 36: 153 - 164.", "Bray RA (1987) Some helminth parasites of marine fishes of South Africa: family Opecoelidae (Digenea). Journal of Natural History 21: 1049 - 1075."]}