Dupliciporia lanterna, Bray, Rodney A. & Justine, Jean-Lou, 2008

Bray, Rodney A. & Justine, Jean-Lou, 2008, Dupliciporia lanterna n. sp. (Digenea: Zoogonidae) from Priacanthus hamrur (Perciformes: Priacanthidae) and additional zoogonids parasitizing fishes from the waters off New Caledonia, Zootaxa 1707, pp. 60-68 : 64-66

Dupliciporia lanterna n. sp. ( Figures 1–5 )

Type-host: Priacanthus hamrur (Forsskål, 1775) , Perciformes : Priacanthidae , moontail bullseye or goggleeye.

Site: Digestive tract.

Type-locality: Récif Tué, off Nouméa, New Caledonia (22°19’S, 166°29’E, 27/03/2007).

Other locality: Ilôt Signal, New Caledonia (22°17’S, 166°17’E, 16/05/2006).

Prevalence: 2 of 3 (67%).

Intensity: 1–11.

Host data: The infected hosts were 340 and 350 mm in fork length, 500 and 750g in weight.

Specimens deposited: Holotype MNHN JNC2156–1, paratypes MNHN JNC 2156–2–3, 1830–1. BMNH 2007.11.14.47–50.

Etymology: The species designation reflects the local name of the fish, ‘lanterne’ referring to its large eyes.

Description: Based on 8 specimens, 6 ventral measured, 2 lateral. Body elongate, narrow, 4,878–5,508 × 350–466 (5,095 × 398), width 6.91–9.14 (7.82) % of body length. Tegument spinous, virtually to posterior extremity. Oral sucker infundibuliform, with 7 pointed lobes; 228–323 × 266–318 (257 × 298), length 4.51– 6.32 (5.05) % of body-length. Ventral sucker equatorial or just pre-equatorial; on slight protuberance, transversely oval, with distinct longitudinal median ridge; 233–299 × 264–338 (269 × 285), 4.74–5.86 (5.29) % of body-length. Sucker-length ratio 1:0.92–1.20 (1.06), width ratio 0.86–1.07 (0.96). Forebody 2,216–2,788 (2,448) long, 43.9–51.6 (48.0) % of body-length. Prepharynx relatively short, but distinct; 238–297 (258) long, 4.59–5.81 (5.07) % of body-length. Pharynx small, broadly oval; 64–103 × 80–99 (78 × 92), length 1.29–2.04 (1.54) % of body-length. Oral sucker to pharynx width ratio 1:0.25–0.35 (0.31). Oesophagus long, coiled anteriorly, undulating in mid-region and more or less rectilinear posteriorly; 1,372–1,886 (1,627) long, length 28.1–36.6 (31.9) of body-length. Intestinal bifurcation in posterior forebody, 460–624 (542) from ventral sucker, at 20.8–24.0 (22.1) % of forebody length. Caeca narrow, undulating around ventral sucker, reaching to various levels of anterior testis, 1,269–1,393 (1,375) from posterior extremity, post-caecal region 12.4– 27.4 (20.2) % of body-length, 137–170 (148)% of post-testicular region.

Testes 2, oval, entire, virtually tandem, close or contiguous, in mid-hindbody; anterior 250–358 × 223– 280 (301 × 251), length 4.89–7.34 (5.92) % of body-length; posterior 273–344 × 218–321 (305 × 265), length 4.96–6.83 (5.99) % of body-length. Distance between testes 0–52 (9), 0.00–1.03 (0.17) % of body-length. Post-testicular region 825–1,014 (932) long, 16.2–19.7 (18.3) % of body-length. Cirrus-sac large, elongateoval, flexed, thick-walled, overlapping ventral sucker and reaching to bifurcal level 519–634 × 163–202 (586 × 180), length 10.3–12.4 (11.5) % of body-length. Internal seminal vesicle coiled, narrow, thick walled, occuping about one third of cirrus-sac length. Pars prostatica thick-walled, lined with anuclear cell-like bodies, more than half length of cirrus sac. Ejaculatory duct short, relatively thin-walled. All of internal male duct surrounded by distinct layer of gland-cells and interspersed radial fibres. Genital atrium relatively small. Genital pore sinistro-lateral at bifurcal level.

Ovary oval, 183–255 × 168–212 (222 × 188), length 3.58–5.05 (4.36)% of body-length; in anterior hindbody, separated from ventral sucker by 26–81 (42), 0.51–1.59 (0.82) % of body-length; pretesticular, separated from anterior testis by coils of uterus and distance of 441–613 (530), 9.05–11.2 (10.4) % of body-length. Seminal receptacle oval, contiguous with posterior margin of ovary. Laurer’s canal opens dorsally at level of seminal receptacle. Mehlis’ gland ventro-postero-sinistral to ovary. Uterus mainly post-testicular reaching close to posterior extremity, passes ventrally to gonads, mainly intercaecal anterior to testes, narrows dorsally to ventral sucker and reaches dorsally to cirrus-sac. Post-uterine distance 40–85 (66), 0.78–1.65 (1.29) % of body-length. Eggs small, tanned, operculate, with 2 distinct raised bands around circumference, very numerous, 32–38 × 15–19 (34 × 16). Metraterm thick-walled, about 25% of cirrus-sac length. Vitellarium of two lateral bands of 8–10 (9.4) follicles (poral side), 7–9 (8.4) (aporal side), between level of ovary and almost to anterior testis; longer field 420–575 (502) long, 8.22–11.3 (9.85) % of body-length, shorter field 391–553 (475) long, 7.66-10.8 (9.32)% of body-length; pre-vitelline distance 2,711-3,290 (2,975), 53.7-62.8 (58.4) % of body-length, post-vitelline distance 1,413-1,729 (1,577), 27.7-34.3 (31.0) % of body-length.

Excretory pore dorsally subterminal, surrounded by distinct globular glandular patch. Excretory vesicle shape and extent obscured by eggs.

Figures

FIGURES 1 – 5. Dupliciporia lanterna n. sp. 1. Ventral view of holotype. 2. Ventral view of oral sucker. 3. Lateral view of terminal genitalia. 4. Proximal female system, ventral view, eggs omitted for clarity. 5. Egg. Abbreviations: ce, posterior extent of caecum; cs, cirrus-sac; ed, ejaculatory duct; er, ridge around egg; gm, glandular mass around genital atrium; Lc, Laurer’s canal; mr, median longitudinal ridge of ventral sucker; Mg, Mehlis’ gland; mt, metraterm; oes, oesophagus; os, oral sucker; ov, ovary; ph, pharynx; pp, pars prostatica; pph, prepharynx; sr, seminal receptacle; sv, seminal vesicle; t, testis; ut, uterus; vf, vitelline follicle. Scale-bars: 1, 1 mm; 2, 4, 100 μm; 3, 200 μm; 5, 20 μm.