Rhinoxenus anaclaudiae, 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 : 452-453

Rhinoxenus anaclaudiae n. sp.

( Fig. 2 )

TYPE MATERIAL. — Holotype ( CHIOC 36300 ); 23 paratypes ( CHIOC 36301 a-e; INPA 439 a-g; MNHN 171 HG-T1 212-212 bis-213; MZUSP 5933 a-h; USNPC 95239 ).

ETYMOLOGY. — The species is named after Dr Ana Claudia dos Santos Brasil, a specialist of Polychaeta.

TYPE HOST AND LOCALITY. — Nasal cavities of Triportheus cf. nematurus (Characidae) , Rio Miranda, Passo do Lontra, Mato Grosso do Sul, Brazil, 30.XI.1996.

OTHER MATERIAL EXAMINED. — Brazil. Rio Miranda, Passo do Lontra, Mato Grosso do Sul, from Brycon sp. (Characidae) , 5.VIII.1998, voucher specimens ( CHIOC 36302). — Baía da Medalha, Rio Miranda, Mato Grosso do Sul, from Triportheus sp. (Characidae) , 4.VIII.1998, voucher specimens ( INPA 440

a-d; MNHN 172 HG-T 1 214-214 bis-215; USNPC 95240).

COMPARATIVE MEASUREMENTS. — See Table 6.

DESCRIPTION

Body pyriform, 254 (n = 1) long; greatest width 98 (n = 1) at body midlength. Cephalic lobes poorly developed; three pairs of cephalic organs; c e p h a l i c g l a n d s p o s t e r o l a t e r a l t o p h a r y n x. Members of posterior pair of eyes larger, closer than those of anterior pair; eye granules elongate. Pharynx 19 (18-20; n = 5) in diameter. Haptor subtriangular, 71 (n = 1) long, 57 (n = 1) wide. Ventral anchor with inconspicuous roots, sclerotized cap of base with projection for articulation to ventral bar, shaft evenly curved, point short, strongly recurved. Dorsal anchor with blunt proximal end, pointed distal end, terminations with conspicuous sclerotized caps. Ventral bar flattened, with slightly thickened ends. Hook pair 2 with erect thumb, lightly curved shaft, short point, proximal 3/4 of shank inflated; filamentous hook (FH) loop extended to near beginning of shank dilation; remaining hooks with erect thumb, long shaft, lightly curved, shank inflated proximally; FH loop extended to near beginning of shank dilation. Male copulatory organ a coiled tube with approximately two rings. Testis oval, 54 (43-64; n = 2) long, 24 (n = 1) wide; seminal vesicle fusiform. Germarium 49 (42-54; n = 4) long, 29 (26-34; n = 4) wide. Ootype, uterus not observed. Vagina sclerotized, proximally wide, tapering distally, distal loop; vaginal vestibule sclerotized, cup shaped. Seminal receptacle pyriform. Large dorsal prostate. Vitellaria coextensive with cecae; vitelline commissure anterior to germarium. Egg not observed.

REMARKS

Rhinoxenus anaclaudiae n. sp. differs from its congeners in possessing a ventral anchor with evenly curved and short shaft and strongly recurved point. Rhinoxenus anaclaudiae n. sp. is apparently restricted to members of Characoidea (sensu Buckup 1998).

Figures

FIG. 2. — Rhinoxenus anaclaudiae n. sp.; A, holotype (ventral); B, male copulatory organ (MCO); C, hook from pair 2; D, hook from pairs 1, 3-7; E, vagina; F, ventral bar; G, dorsal anchor; H, ventral anchor. Scale bars: A, 100 μm; B-E, 10 μm; F-H, 30 μm.