Haliotrematoides nagibinae, Kritsky, Yang & Sun, 2009

Kritsky, Delane C., Tingbao, Yang & Yuan, Sun, 2009, Dactylogyrids (Monogenoidea, Polyonchoinea) parasitizing the gills of snappers (Perciformes, Lutjanidae): Proposal of Haliotrematoides n. gen. and descriptions of new and previously described species from marine fishes of the Red Sea, the eastern and Indo-west Pacific Ocean, Gulf of Mexico and Caribbean Sea, Zootaxa 1970 (1970), pp. 1-51 : 25

Haliotrematoides nagibinae n. sp.

( Figs. 55–60)

Type host and locality: Mangrove red snapper, Lutjanus argentimaculatus (Forsskål) (Lutjanidae) : Gulf of Tonkin (South China Sea) near Lingao, Hainan Province, China (20 o 0' N, 109 o 5' E), 20, 23 September 2003.

Other records: Lutjanus argentimaculatus (Lutjanidae) : Dapeng Bay near Nanao ( South China Sea ), Guangdong Province, China (23 o 25' N, 117 o 02' E), 24 July 2007 ; South China Sea near Zhanjiang , Guangdong Province, China, 13 July 2004 .

Site of infection: Gills.

Specimens studied: Holotype, USNPC 101331 ; 11 paratypes, USNPC 101332 , 101333 , 101334 , BMNH 2008.11.19.21-22, ZSU 2007072401-02; 2 voucher specimens, ZSU 2004071301–02.

Etymology: This species is named for L. F. Nagibina, formerly of the USSR Academy of Sciences, Leningrad, Russia, in recognition of her work on the Monogenoidea.

Description: Greatest width of body usually at level of testis or near midlength of trunk. Cephalic lobes well developed. Posterior eyespots with lenses. Pharynx subovate. Testis ovate; germarium variable. Seminal vesicle inconspicuous; MCO comprising proximal cup-shaped base, distal tubular shaft expanded proximally and quickly tapering to fine coil distally; coil counterclockwise, with 3–4 complete rings; prostate, prostatic reservoir not observed. Vaginal pore simple within tegumental indentation; seminal vestibule lightly sclerotized, with delicate internal ridges; vaginal canal delicate; seminal receptacle inconspicuous. Anchors similar, each with short depressed superficial root, inconspicuous deep root, heavy shaft with distal inner blade, straight recurved point with delicate superficial grooves; ventral anchor lacking basal perforation. Ventral bar variable, with two submedial pockets along anterior margin, shield-like projection on posterior margin often appearing perforated; dorsal bar rod-shaped, with ends slightly expanded. Hook distribution typical.

Measurements: Body 338 (294–401; n = 5) long; greatest width 69 (58–82; n = 5). Haptor 70 (64–77; n = 5) long, 62 (60–67; n = 4) wide. Pharynx 21 (17–24; n = 5) wide. MCO 60 (51–68; n = 6) long. Ventral anchor 49 (45–53; n = 11) long; dorsal anchor 50 (46–54; n = 11) long. Ventral bar 26 (22–29; n = 7) long; dorsal bar 29 (24–33; n = 7) long. Hook 13 (11–14; n = 18) long. Germarium 32 (28–36; n = 2) long, 22 (21–24; n = 2) wide; testis 44–45 (n = 1) long, 23–24 (n = 1) wide.

Remarks: Haliotrematoides nagibinae most closely resembles H. noncalcaris , H. noncalcaroides and H. brachyflagellocirrus in the general morphology of the haptoral armament and base of the MCO. It is easily distinguished from these species by possessing a fine coiled shaft of the MCO with 3–4 counterclockwise rings (fewer than 2 rings in H. noncalcaris , H. noncalcaroides and H. brachyflagellocirrus ) and by having shafts of the ventral and dorsal anchors with distal inner blades (absent in the latter species). Other species of Haliotrematoides with blades on the inner surfaces of their respective anchor shafts include H. hatzenbuehlerae , H. longihamus , H. potens , H. tainophallus , H. lanx , H. mediohamus , H. mediohamides , and H. prolixohamus . However, H. nagibinae is easily distinguished from these species by having a delicate and coiled shaft of the MCO.