Annulotrematoides glossophallus, Cohen, Simone Chinicz, Kohn, Anna & Boeger, Walter A., 2012

Cohen, Simone Chinicz, Kohn, Anna & Boeger, Walter A., 2012, Neotropical Monogenoidea. 57. Nine new species of Dactylogyridae (Monogenoidea) from the gill of Salminus brasiliensis (Characidae, Characiformes) from the Paraná River, State of Paraná, Brazil, Zootaxa 3149, pp. 57-68 : 63-65

Annulotrematoides glossophallus sp. n.

( Figs 19–24 )

Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the locality of Guaira (24º04’48’’S, 54º15’21’’W), State of Paraná, Brazil

Prevalence. 15.3% (4 of 26 fishes examined)

Specimens studied. Holotype, CHIOC 37607; 10 paratypes, CHIOC 37586, 37618, 37625, 37627, 37629, 37642, 37657a–b, 37669, 37682.

Etymology. The species name is from the Greek (glossa =tongue + phallus =penis) and refers to the morphology of the distal end of the MCO resembling a tongue.

Description. (Based on 12 specimens). Body 366 (315–440; n=4) long, 110 (86–175;n=4) wide. Tegument with annulations. Cephalic lobes moderately developed. Eyes 4, posterior pair larger than anterior pair. Pharynx spherical, 26 (22–30; n=6) in diameter. Haptor subhexagonal, with 7 pairs of hooks with ancyrocephaline distribution. Ventral bar 65 (60–73; n=7) long, with expanded ends and anteromedian expansion. Dorsal bar 65 (55–79; n=6) long, rod-shaped, with slightly expanded ends. Ventral anchor 44 (35–57; n=12) long, with well-differentiated roots, superficial root longer than deep root, base width 24 (20–30; n=12), slightly curved shaft, recurved point. Dorsal anchor 44 (32–55; n=5) long, elongate superficial root, curved shaft, point, base width 22 (18–28; n=3).

Hook pairs 1 and 5, 18 (15–20; n=13), pairs 2–4,6–7, 24 (20–27; n=29), each with erected thumb, shank divided into 2 sub-units, proximal subunit of shank expanded. FH loop well developed, 0.4 shank length. MCO 33 (25–40; n=6) long, a sclerotized tube, robust, slightly arcuate, with a tongue-like expansion on the distal end, base with delicate flange. Accessory piece 34 (32–36; n=5) long, articulated, rod-shaped, distally pointed, flap-like projection near midlength. Testis dorsal to germarium; seminal vesicle a dilation of vas deferens. Germarium 75 (n=1) long, elongate. Vitellaria in two bilateral fields of trunk, from pharynx to the posterior region of trunk, coextensive with intestinal ceca. Oviduct, ootype not observed. Vaginal aperture sinistral, vagina muscular.

Remarks. Annulotrematoides glossophalllus sp. n. differs from the previously known species of the genus, A. amazonicus and A. bryconi , by the comparative morphology of the structures of the copulatory complex. The new species, contrary to the remaining two species, presents a relatively robust and slightly arcuate MCO with a distinctive tongue-shaped expansion at the distal opening. The presence of the flap-like expansion near midlength of the accessory piece is also a unique feature of A. glossophalus sp. n.

Figures

FIGURES 13 – 30. Sclerotized parts of Annulotrematoides spp. from the dourado, Salminus brasiliensis, from Paraná River, Brazil. Figs. 13 – 18. Anulotrematoides bryconi Cugliana, Cordeiro & Luque, 2003. 13. Copulatory complex (ventral view). 14. Hook. 15. Ventral anchor. 16. Dorsal anchor. 17. Ventral bar. 18. Dorsal bar. Figs. 19 – 24. Annulotrematoides glossophallus sp. n. 19. Copulatory complex (dorsal view). 20. Hook. 21. Ventral anchor. 22. Dorsal anchor. 23. Ventral bar. 24. Dorsal bar. Figs. 25 – 30. Annulotrematoides parisellei sp. n. 25. Copulatory complex (ventral view). 26. Hook. 27. Ventral anchor. 28. Dorsal anchor. 29. Ventral bar. 30. Dorsal bar. All figures are drawn to the 30 μm scale, except figs. 14, 20 and 26 (10 μm scale) and fig. 25 (15 μm scale).