Annulotrematoidess parisellei, 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 : 65

Annulotrematoidess parisellei sp. n.

( Figs. 25–30 )

Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the localities of Foz do Iguaçú (25º32’52’’S, 54º35’17’’W) and Guaira (24º04’48’’S, 54º15’21’’W), State of Paraná, Brazil

Prevalence. 26.9% (7 of 26 fishes examined)

Specimens studied. Holotype, CHIOC 37689; 34 paratypes, CHIOC 37585, 37589–37593, 37597, 37608, 37619, 37622a–b, 37634, 37643, 37648–37649a–b, 37652, 37658, 37664a–b, 37667, 37676–37677, 37680, 37685–37686, 37692a–b, 37694, 37698a–b, 37701, 37715, 37725.

Etymology. The new species is named after Dr Antoine Pariselle, a good friend and an exceptional scientist that studies the diversity and the biogeography of monogenoids from cichlids.

Description. (Based on 38 specimens). Body 417 (325–520; n=12) long, 100 (70–145; n=12) wide. Tegument with annulations in the posterior half of body. Cephalic lobes well developed; four pairs of head organs lying in cephalic lobes; cephalic glands lateral to pharynx. Eyes 4, posterior pair larger than anterior pair. Pharynx spherical 25 (17–39; n=10) in diameter. Haptor subhexagonal, with 7 pairs of hooks with ancyrocephaline distribution. Ventral bar 57 (51–62; n=18) long, with enxpanded ends, postero-median knob. Dorsal bar 56 (50–64; n=21) long, ends slightly expanded. Ventral anchor 38 (35–45; n=38) long, with well differentiated roots, superficial root longer than deep root, base width 19 (15–20; n=38), evenly curved shaft, point. Dorsal anchor 34 (31–39; n=20) long, superficial root subrectangular, shaft, point evenly curved, base width 17 (14–20; n=17). Hook pairs 1 and 5, 17 (15–20; n=25) long, pairs 2–4,6–7, 23 (20–26; n=85) long, each with erected thumb, shank divided into 2 subunits, proximal subunit of shank expanded. FH loop well developed, 0.5 shank length. MCO a slender, delicate, arcuate tube; base wide, with well developed sclerotized flange. Accessory piece articulated to MCO by short copulatory process, distally bifurcated; one ramus blunt, one hook-shaped. Testis 34 (30–42; n=5) long, 27 (25–30; n=5) wide, dorsal to germarium; seminal vesicle a dilation of vas deferens, prostatic reservoir sigmoid. Vitellaria in two bilateral fields of trunk, from pharynx to the posterior region of trunk, coextensive with intestinal ceca. Oviduct, ootype not observed. Vagina a sinuous tube, non-sclerotized, opening sinistral.

Remarks. Although the morphology of the haptoral sclerites of Annulotrematoides parisellei sp. n. closely resembles those of A. bryconi and A. glossophallus , the general morphology of the copulatory complex of the new species resembles more closely that of A. amazonicus . However, the new species can be easily distinguishable from A. bryconi and A. glossophallus by the comparative morphology of the copulatory complex and from A. amazonicus by the morphology of all haptoral sclerites, especially the anchors. The MCO of A. parisellei is arcuate and delicate while those of A. bryconi and A. glossophallus are robust with a tongue-shape distal end. On the other hand, the anchors of A. amazonicus depict a long shaft and a reduced and recurved point, while A. parisellei presents both ventral and dorsal anchors with conspicuous points evenly curved with the shafts.

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).