Haliotrematoides lanx Kritsky & Justine, 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 : 25-27

Haliotrematoides lanx Kritsky & Justine n. sp.

( Figs. 61–66)

Type host and locality: Five-lined snapper, Lutjanus quinquelineatus (Bloch) (Lutjanidae) : La Régniėre, Off Nouméa, New Caledonia (22 o 19.804'S, 166 o 20.229'E), 8 September 2005, 19 March 2007.

Site of infection: Gills.

Specimens studied: Holotype, MNHN JNC 1590 (Th164); 10 paratypes, USNPC 101344 , 101345 , MNHN JNC 2145 (Th165 bis), JNC 2140 (Th165), BMNH 2008.11.19.36-37.

Etymology: The specific name (a noun) is from Latin ( lanx = a dish, platter or plate) and refers to the base of the MCO.

Description: Greatest width of body usually at level of base of MCO. Cephalic lobes well developed. Posterior pair of eyespots with lenses. Pharynx ovate. Testis subspherical to ovate; germarium subrectangular. Seminal vesicle inconspicuous; MCO comprising proximal saucer-shaped base, heavy slightly tapered coiled tubular shaft with 1 ½ clockwise rings and distal fleshy mass having terminal recurved knob; prostatic reservoir not observed. Vaginal pore simple; seminal vestibule large, C shaped; vaginal canal delicate, originating from proximal portion of vaginal vestibule, then extending anteromedially and recurving toward ootype; seminal receptacle inconspicuous. Ventral anchor with elongate somewhat depressed superficial root, short deep root, robust shaft having distal inner blade, straight recurved point with delicate superficial grooves. Dorsal anchor with elongate superficial root, inconspicuous to nonexistent deep root, straight shaft having distal inner blade, straight recurved point with light superficial grooves. Ventral bar with two submedial pockets along anterior margin; dorsal bar rod-shaped, with ends slightly bent posteriorly and reduced in diameter. Hook distribution typical.

Measurements: Body 302–303 (n = 1) long; greatest width 63 (61–66; n = 3). Haptor 67–68 (n = 1) long, 72–73 (n = 1) wide. Pharynx 21 (19–22; n = 3) wide. MCO 55 (48–61; n = 7) long. Ventral anchor 53 (51–56; n = 8) long; dorsal anchor 51 (49–54; n = 8) long. Ventral bar 32 (30–33; n = 3) long; dorsal bar 34 (32–37; n = 5) long. Hook 13 (12–14; n = 19) long. Germarium 25 (22–28; n = 3) long, 21–22 (n = 3) wide; testis 27 (23–30; n = 3) long, 25 (24–28; n = 3) wide.

Remarks: Haliotrematoides lanx is closest morphologically to H. patellacirrus , from which it is easily differentiated by the comparative morphology of copulatory complex and anchors (see Remarks for H. patellacirrus ).