Phyllodistomum hoggettae, Ho, Hei Wa, Bray, Rodney A., Cutmore, Scott C., Ward, Selina & Cribb, Thomas H., 2014

Ho, Hei Wa, Bray, Rodney A., Cutmore, Scott C., Ward, Selina & Cribb, Thomas H., 2014, Two new species of Phyllodistomum Braun, 1899 (Trematoda: Gorgoderidae Looss, 1899) from Great Barrier Reef fishes, Zootaxa 3779 (5), pp. 551-562 : 552

Phyllodistomum hoggettae n. sp.

( Fig. 1 , 3 )

Syn. Phyllodistomum sp. 1 of Cutmore et al. (2013)

Type-locality: Off Lizard Island, northern Great Barrier Reef (14°40'S 145°27'E).

Type-host: Plectropomus leopardus (Lacepède) , Leopard coralgrouper ( Perciformes : Serranidae ).

Site in host: Urinary bladder.

Prevalence: 4 of 5 (80%).

Type material: Holotype QM G234189; Paratypes QM G234190–234203.

Etymology: This species is named for Dr Anne Hoggett, Co-Director, with Dr Lyle Vail, of the Lizard Island Research Station and a strong supporter of our work over many years.

Description: (Measurements are of 17 gravid, unflattened specimens) Body spatulate, 3,483–4,765 (4,140) × 968–1,855 (1,506). Forebody narrow and tapering, 862–1,552 (1,064) long, occupying 20.9–33.3 (25.7)% of total body length. Hindbody discoid, with 7–9 pronounced marginal undulations on each side of hindbody; marginal undulations produced by distinct lateral muscular loops, most pronounced in largest specimens. Body length to width ratio 1: 2.39–3.60 (2.79). Oral sucker opening subterminally, 280–445 (330) × 280–411 (305). Pharynx absent. Intestinal bifurcation midway between oral and ventral suckers. Ventral sucker distinctly larger than oral sucker, 368–554 (433) × 364–518 (440). Oral sucker to ventral sucker width ratio 1: 1.12–1.71 (1.46). Oesophagus 101–485 (264) long. Caeca simple, blind tubes terminating 395–812 (589) from posterior extremity. Testes slightly lobed, oblique, in mid-body; anterior testis 155–341 (276) × 91–390 (256); posterior testis 179–457 (308) × 152– 544 (284). Genital pore median, 39–376 (142) anterior to ventral sucker. Seminal vesicle bipartite, extends from slightly posterior to anterior margin of ventral sucker to about midway between intestinal bifurcation and ventral sucker, directly dorsal to genital pore; posterior chamber large, running anteriorly then constricting to smaller ventral anterior chamber. Prostatic chamber and surrounding cells ventral to anterior chamber of seminal vesicle. Ovary entire, sub-circular, sinistrally posterior to ventral sucker and anterior to testes, 78–331 (205) × 65–230 (160). Vitelline lobes entire and almost round; left lobe immediately anterior to ovary, posterior to ventral sucker, 124–275 (175) × 72–214 (124); right lobe 107–286 (191) × 55–224 (126). Laurer’s canal not detected. Uterus intracaecal in hindbody, in extensive coils extending just posterior to ends of intestinal caeca. Eggs 36–57 (49) × 21–33 (29). Excretory vesicle tubular; anterior extent obscured by uterus in all specimens. Excretory pore dorsal, midway between posterior extremity and ends of caeca.

Figures

FIGURES 1 – 2. 1. Phyllodistomum hoggettae n. sp. from Plectropomus leopardus, ventral (Holotype QM G 234189). 2. Phyllodistomum vaili n. sp. from Mulloidichthys vanicolensis, ventral (Holotype QM G 234219). Scale bars: 1, 1 mm; 2, 500 µm.

FIGURES 3 – 4. 3. Phyllodistomum hoggettae n. sp. from Plectropomus leopardus, terminal genitalia (Paratype QM G 234194). 4. Phyllodistomum vaili n. sp. from Mulloidichthys vanicolensis, terminal genitalia (Paratype QM G 234221). ACSV—anterior chamber seminal vesicle; GP—genital pore; PCSV—posterior chamber seminal vesicle; PP—pars prostatica; U—uterus. Scale bars: 1, 2 100 µm.