Rhinoxenus curimbatae, Domingues & Boeger, 2005

Domingues, Marcus V. & Boeger, Walter A., 2005, Neotropical Monogenoidea. 47. Phylogeny and coevolution of species of Rhinoxenus (Platyhelminthes, Monogenoidea, Dactylogyridae) and their Characiformes hosts (Teleostei, Ostariophysi) with description of four new species, Zoosystema 27 (3), pp. 441-467 : 453

Rhinoxenus curimbatae n. sp.

( Fig. 3 A-F) TYPE MATERIAL. — Holotype ( CHIOC 36303 ); paratypes ( CHIOC 36304 a-b; INPA 419 ; MNHN 153 HG-T1 195).

ETYMOLOGY. — The specific epithet refers to the local name of the host, “curimbatá”.

TYPE HOST AND LOCALITY. — Nasal cavities of Prochilodus cf. lineatus (Prochilodonidae) , Represa Capivari-Cachoeira, Municipality of Campina Grande do Sul, metropolitan area of Curitiba, Paraná, Brazil, 15.III.1995.

DESCRIPTION

Body 700 (n = 1) long; greatest width 130 (n = 1) at body midlength. Eyes usually present, equidistant; eye granules elongate. Pharynx spherical, 30 (n = 1) in diameter. Haptor subtrapezoidal, 82 (n = 1) long, 75 (n = 1) wide. Ventral anchor 50 (42-56; n = 5) long, base 42 (30-53; n = 4) wide, superficial, roots inconspicuous, base with sclerotized cap articulated with ventral bar, knoblike projection on base, short recurved shaft, elongate straight point. Dorsal anchor 50 (31-59; n = 4) long, base 4 (3-5; n = 4) wide, robust, with blunt proximal end, straight shaft, distal end diagonally truncated. Ventral bar 42 (30-53; n = 1) long with expanded ends. Hooks 14 (11-17; n = 15) long, similar in shape, truncate thumb, evenly curved shaft, point, shank without inflation, FH loop extending to half of shank. Male copulatory organ a coiled tube with approximately 3.5 rings; greatest ring 27 (24-29; n = 4) in diameter; copulatory ligament twisted. Gonads, ootype, uterus, seminal receptacle not observed. Vagina sclerotized; distal portion tubular, sinuous; proximal end wide; vaginal vestibule heavily sclerotized, cup-shaped. Egg not observed.

REMARKS

Rhinoxenus curimbatae n. sp. resembles R. nyttus based on the morphology of the MCO. However, it differs from this and other species of the genus by possessing dorsal anchors with distal end diagonally truncated, ventral anchors with short recurved shafts and elongate straight points, heavily sclerotized cup-shaped vaginal vestibule, and hooks with shanks not inflated.

Figures

FIG. 3. — Sclerotized structures in Rhinoxenus; A-F, R. curimbatae n. sp.; A, male copulatory organ (MCO); B, vagina; C, ventral anchor; D, dorsal anchor; E, hook; F, ventral bar; G-M, R. guianensis n. sp.; G, male copulatory organ (MCO); H, vagina; I, hook from pair 2; J, hook from pairs 1, 3-7; K, ventral bar; L, ventral anchor; M, dorsal anchor. Scale bars: A, B, 20 μm; C, D, F, 30 μm; E, I, J, 15 μm; G, H, 10 μm; K-M, 50 μm.