75 research outputs found
New species and reports of dactylogyrids (Monogenoidea) from Salminus franciscanus (Actinopterygii: Bryconidae) from the upper São Francisco River, Brazil
No full textMonteiro, Cassandra Moraes, Cohen, Simone Chinicz, Brasil-Sato, Marilia Carvalho (2015): New species and reports of dactylogyrids (Monogenoidea) from Salminus franciscanus (Actinopterygii: Bryconidae) from the upper São Francisco River, Brazil. Zootaxa 3941 (1): 137-143, DOI: 10.11646/zootaxa.3941.1.
Anacanthorus parakruidenieri Cohen, Kohn & Boeger, 2012, sp. n.
No full textAnacanthorus parakruidenieri sp. n. (Figs. 9–10) Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the locality of Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 21 ’’W), State of Paraná, Brazil Prevalence. 19.2% (5 of 26 fishes examined) Specimens studied. Holotype, CHIOC 37656; 10 paratypes, CHIOC 37603 a–b, 37617, 37624, 37633 a–b, 37639, 37661 a–b, 37697. Etymology. The species name alludes to its proximity to Anacanthorus kruidenieri Kritsky, Thatcher & Kayton, 1979. Description. (Based on 11 specimens). Body 600 (445–775; n= 7) long, 140 (110–170; n= 7) wide. Tegument smooth. Cephalic lobes well developed. Eyes 4, posterior pair larger than anterior pair. Pharynx 32–50 long, 30–36 wide (n= 2). Haptor with 7 pairs of hooks with anacanthorine distribution. Anchors, bars absent. Hooks 43 (40–47; n= 41), with truncate thumb, straight shaft, recurved point inconspicuous or absent, shank with expanded proximal bulbous portion with anterior subcircular foramen; bulbous portion of shank of variable length. FH loop 0.5 length of shank. Male copulatory organ 83 (75–87; n= 7) long, a sclerotized tube, wide, slightly sinuous, base lacking sclerotized flange. Accessory piece 74 (70–80; n= 7) long, articulated, rod-shaped, bifid near midlength, branches distally blunt. Testis post germarian; seminal vesicle a dilation of vas deferens; vas deferens looping left intestinal cecum. Germarium 40 long, 70 wide (n= 1). Vitellaria in two bilateral fields of trunk, from pharynx to the posterior region of trunk, coextensive with intestinal ceca. Oviduct, ootype not observed. Metraterm delicate, non sclerotized. Eggs not observed. Remarks. The shape of the marginal hooks, with an inconspicuous point, truncate thumb and a bulbous proximal shank bearing a foramen, and of the copulatory complex suggests the morphological and, likely, the phylogenetic proximity of the new species to Anacanthorus kruidenieri Kritsky, Thatcher & Kayton, 1979, a parasite of Brycon melanopterus (Cope) from Amazon River Basin. These species are, however, easily distinguishable by the presence of a bifurcated accessory piece and a subcircular foramen in the shank bulb of A. parakruidnieri sp. n. The accessory piece of A. kruidenieri is single and the foramen of the hook shank elongate and ovate.Published as part of 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, pp. 57-68 in Zootaxa 3149 on page 62, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
Dactylogyridae Bychowsky 1933
No full textDactylogyridae Bychowsky, 1933 <p> <i>Diaphorocleidus</i> Jogunoori, Kritsky & Venkatanarasaiah, 2004</p>Published as part of <i>Silva, Marciara Lopes, Cohen, Simone Chinicz, Ottoni, Felipe Polivanov, Viana, Diego Carvalho, Meneses, Yuri Costa De & Justo, Marcia Cristina Nascimento, 2024, Two new species of Diaphorocleidus and new data on D. affinis (Monogenoidea: Dactylogyridae) parasitizing Bryconops cf. affinis (Characiformes: Iguanodectidae) from the Munim River basin, State of Maranhão, northeastern Brazil, pp. 91-103 in Zootaxa 5403 (1)</i> on page 95, DOI: 10.11646/zootaxa.5403.1.6, <a href="http://zenodo.org/record/10561629">http://zenodo.org/record/10561629</a>
Anacanthorus douradensis Cohen, Kohn & Boeger, 2012, sp. n.
No full textAnacanthorus douradensis sp. n. (Figs. 7, 8) Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the locality of Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 21 ’’W), State of Paraná, Brazil Prevalence. 19.2% (5 out of 26 fishes examined) Specimens studied. Holotype, CHIOC 37594; 8 paratypes, CHIOC 37584, 37599 a–b, 37610–37611, 37616, 37654, 37679. Etymology. The specific name refers to the common regional name of the host (“dourado”). Description. (Based on 14 specimens). Body fusiform, 1,204 (850 – 1,500; n= 12) long, 342 (180–420; n= 12) wide. Tegument with subcircular scales distributed from peduncle to level of MCO. Cephalic lobes well developed. Eyes 4, posterior pair slightly farther than anterior pair; accessory granules spread in cephalic region. Pharynx spherical, 81 (56–110; n= 11) long, 68 (44–90; n= 11) wide. Haptor 140–162 (n= 2) wide, slightly bilobed, with concave posterior border, 7 pairs of hooks with anacanthorine distribution (4 ventral, 3 dorsal pairs of hooks) and 2 pairs (1 dorsal, 1 ventral) of 4 A’s. Anchors, bars absent. Hooks 16–23 (19; n= 16), similar in shape and size, with depressed thumb, curved shaft, short recurved point, shank proximally expanded with indented circular foramen; FH loop well developed, extending to distal subunit. MCO 187 (178–227; n= 12) long, a loose spiral with funnelshaped base, distal end flattened, expanded, lateral to longitudinal axis of MCO. Accessory piece 178 (125–200; n= 11) long, articulated to MCO base by proximal process, composed of single rod-shape section that bifurcates into two branches at about 1 / 5 of its length; short branch rod shape, with blunt distal end; longer branch proximally bent on itself, with expanded distal end. Testis postgermarial, 138 (108–175; n= 5) long; seminal vesicle elongate, a dilation of vas deferens; two prostatic reservoirs lying beneath (dorsal to) MCO; vas deferens looping left intestinal cecum. Germarium 70 (40–110; n= 4) long, 78 (68–90; n= 4) wide, subovate. Vitellaria in two bilateral fields of trunk, from pharynx to the posterior region of testes, coextensive with intestinal ceca. Egg 56 long, 32 wide, oval, lacking filament. Oviduct, ootype not observed. Metraterm with delicate wall, non-sclerotized. Remarks. Anacanthorus douradensis n. sp. appears closely related to Anacanthorus colombianus Kritsky & Thatcher, 1974 from the gills of S. affinis Steindachner from Colombia mainly by sharing a MCO composed of a loosely spiraled tube. Further similarities that suggest their phylogenetic proximity are related to the presence of an articulated and bifurcated accessory piece, with one of the rami presenting a thumb-like structure, and the expanded distal end of the MCO. The two species may be differentiated by 1) the bifurcation of the accessory piece, which in A. colombianus is located in the mid-length of the accessory piece while in A. douradensis sp. n. it occur close to the proximal portion of the structure; 2) the rami of the accessory piece of the new species are subequal with a long expanded and a short blunt ramus (about the same length and pointed in A. colombianus); and 3) based on the original illustrations of A. colombianus (Fig. 4, Kritsky & Thatcher 1974), the MCO of the new species appears to have more coils (about 6 coils in the new species and 3 coils in the MCO of A. colombianus).Published as part of 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, pp. 57-68 in Zootaxa 3149 on pages 61-62, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
Jainus iocensins Cohen, Kohn & Boeger, 2012, sp. n.
No full textJainus iocensins sp. n. (Figs. 31–36) Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the locality of Foz do Iguaçú (25 º 32 ’ 52 ’’S, 54 º 35 ’ 17 ’’W) and Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 21 ’’W), State of Paraná, Brazil Prevalence. 19.2% (5 of 26 fishes examined) Specimens studied. Holotype, CHIOC 37647 a; 38 paratypes, CHIOC 37606, 37635, 37637 a–c– 37638, 37640 a–b, 37644–37646 – 37647 b, 37650–37651, 37653, 37655, 37670, 37672 a–c– 37673 a–b, 37675, 37687 a–b, 37690, 37695 a–c, 37700, 37702–37704, 37708, 37710 a–b, 37712, 37723. Etymology. The specific name alludes and honors the name of the Instituto Oswaldo Cruz (IOC) in recognition of its importance to the study of parasitology of sylvatic and domestic animals in Brazil and South America. Description. (Based on 57 specimens). Body robust, pyriform, 330 (225–450; n= 33) long, 139 (94–178; n= 33) wide at midlength. Cephalic region with apical, two poorly developed cephalic lobes. Eyes 4, equidistant. Pharynx 19 (17–21; n= 18) in diameter. Haptor with 7 pairs of hooks, with ancyrocephaline distribution. Ventral bar 19 (17– 20; n= 8) long, broadly v–shaped with a posteromedian projection. Dorsal bar 31 (26–35; n= 28) long, straight, rod– shaped. Ventral anchor 9 (7–12; n= 55), with deep root, superficial root bearing irregular sclerotization, bladelike point and shaft, base width 9 (6–12; n= 55). Dorsal anchor 33 (27–37; n= 58) long, with poorly developed deep root, long superficial root, long, straight shaft with a hump-like thickening in the deep surface of the blade, sharply recurved point; base width 17 (15–20; n= 58). Hooks 11 (8–15; n= 42) long, with erected thumb, curved point, proximal enlargement of shank subcircular. FH loop about 0.6 shank length. MCO 21 (8–23; n= 24) long, a thin sclerotized tube of one clockwise ring. Accessory piece 18 (15–21; n= 24) long, hook-shaped, articulated to base of MCO by a copulatory ligament. Vagina sinistral. Vitellaria on two sides of trunk, absent in regions of reproductive organs. Egg ovate 53 (46–63; n= 8) long, 41 (38–47; n= 8), lacking polar filament. Remarks. Besides the new species, four other species of Jainus are known: J. jainus Mizelle, Kritsky & Crane, 1968 from Chalceus macrolepidotus, J. robustus Mizelle, Kritsky & Crane, 1968 from Bryconops affinis (= Creatochanes affinis), J. amazonensis Kritsky, Thatcher & Kayton, 1980 from Brycon melanopterus described from Brazil and J. hexops Kritsky & Leiby, 1972 from Astyanax fasciatus from Costa Rica. However, the morphology of anchors suggests that the new species most closely resembles J. amazonensis. It differs from this species by having a large sclerotization on the superficial root of ventral anchor and by the shape of the accessory piece, which is flabellate distally in J. amazonensis and hook-shaped in the new species.Published as part of 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, pp. 57-68 in Zootaxa 3149 on page 66, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
Anacanthorus contortus Cohen, Kohn & Boeger, 2012, sp. n.
No full textAnacanthorus contortus sp. n. (Figs. 3–4) Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the locality of Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 21 ’’W), State of Paraná, Brazil Prevalence. 30.7% (8 of 26 fishes examined) Specimens studied. Holotype, CHIOC 37662 a; 30 paratypes, CHIOC 37583, 37601 a–c, 37605, 37615, 37620 a–b, 37621 a–b, 37626, 37632, 37660 a–c, 37662 b, 37705–37707, 37714, 37716, 37718 a–b– 37721, 37724, 37727 a–b, 37729. Etymology. The specific name is from latin (contortus = whirling) and refers to the intricate organization of the accessory piece. Description. (Based on 47 specimens). Body 801 (460 – 1,020; n= 14) long, 246 (165–345; n= 14) wide. Tegument smooth. Cephalic lobes 3, well developed, each with head organs. Eyes 4, posterior pair larger than anterior; accessory granules scattered in cephalic region. Pharynx 54 (40–64; n= 17) long, 46 (38–60; n= 17) wide. Haptor with 7 pairs of hooks, anacanthorine distribution. Anchors, bars absent. Hooks 19 (16–22; n= 82) long, with depressed thumb, curved shaft, short recurved point, shank proximally expanded; FH loop about ½ shank length. MCO 106 (92–115; n= 38) long, a wide sigmoid tube, with complex prominent flare distal end; base with heavily sclerotized borders, opening lateral to longitudinal axis of MCO. Accessory piece 79 (67–87; n= 38) long, articulated to base of MCO, rod-like, with two main branches; one long, straight, distally tapering; another composed of 4 sub-branches, two short medial, two long distal. Testis 80 long, 56 wide (n= 1), postgermarial; seminal vesicle a dilation of vas deferens; vas deferens looping left intestinal cecum. Germarium 62 (44–75; n= 3) long, 92 (80–110; n= 3), irregular, pretesticular. Vitellaria in two bilateral fields of trunk, from pharynx to the posterior region of trunk, coextensive with intestinal ceca. Oviduct, ootype not observed. Eggs 38–61 long, 40–63 wide (n= 3), spherical, bearing short filament. Metraterm delicate. Remarks. Anacanthorus contortus sp. n. is apparently a member of a group of Anacanthorus species parasitizing Triportheus spp., including, A. chaunophallus Kritsky, Boeger & Van Every, 1992, A. cornutus Kritsky, Boeger & Van Every, 1992, A. formosus Kritsky, Boeger & Van Every, 1992, A. euryphallus Kritsky, Boeger & Van Every, 1992, A. furculus Kritsky, Boeger & Van Every, 1992, A. glyptophallus Kritsky, Boeger & Van Every, 1992, A. lygophallus Kritsky, Boeger & Van Every, 1992, A. nanus Kritsky, Boeger & Van Every, 1992, A. pelorophallus Kritsky, Boeger & Van Every, 1992, A. pithophallus Kritsky, Boeger & Van Every, 1992, A. quinqueramus Kritsky, Boeger & Van Every, 1992 and A. ramulosus Kritsky, Boeger & Van Every, 1992. All of these species depict a wide MCO tube and a branched and articulated accessory piece. The new species resembles A. quinqueramus Kritsky, Boeger & Van Every, 1992 from Triportheus albus Cope, Triportheus elongatus (Guenther) and Triportheus sp. from Amazon River Basin, in depicting an accessory piece composed by five branches. However, in this previously described species, these branches are significantly shorter and their arrangement is conspicuously distinct from that of A. contortus sp. n. While the new species has an accessory piece composed by two main branches, one of them branching into 4 sub-branches, A. quinqueramus depicts a long ramus connected to one short and two long rami, one of which depict a short subterminal branchPublished as part of 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, pp. 57-68 in Zootaxa 3149 on page 60, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
Annulotrematoidess parisellei Cohen, Kohn & Boeger, 2012, sp. n.
No full textAnnulotrematoidess 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 (25 º 32 ’ 52 ’’S, 54 º 35 ’ 17 ’’W) and Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 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, 37622 a–b, 37634, 37643, 37648–37649 a–b, 37652, 37658, 37664 a–b, 37667, 37676–37677, 37680, 37685–37686, 37692 a–b, 37694, 37698 a–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.Published as part of 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, pp. 57-68 in Zootaxa 3149 on page 65, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
Anacanthorus daulometrus Cohen, Kohn & Boeger, 2012, sp. n.
No full textAnacanthorus daulometrus sp. n. (Figs. 5–6, 11– 12) Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the locality of Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 21 ’’W), State of Paraná, Brazil Prevalence. 30.7% (8 of 26 fishes examined) Specimens studied. Holotype, CHIOC 37681; 25 paratypes, CHIOC 37596, 37602, 37614, 37630, 37636, 37641, 37659, 37663, 37666 a–c, 37668, 37671, 37683–37684, 37709 a–b, 37711 a–c, 37713 a–b, 37717, 37726, 37728. Etymology. The specific name is from Greek (daulo = thick and metra =womb) and refers to the presence of a metraterm with sclerotized walls. Description. (Based on 26 specimens). Body 525 (460–600; n= 8) long, 183 (105–220; n= 8) wide. Tegument smooth. Cephalic lobes well developed. Eyes 4, posterior pair larger than anterior; accessory granules scattered in cephalic region. Pharynx 36 (30–45; n= 3) long, 28–45 (34; n= 3) wide. Haptor 52 (34–70; n= 15) long, 127 (86– 175; n= 15) wide, slightly bilobed, with 7 pairs of hooks with anacanthorine distribution. Anchors, bars absent. Hooks 23 (18–27; n= 63) long, with depressed thumb, curved shaft, short recurved point, shank proximally expanded; FH loop about ½ shank length. MCO 88 (77–98; n= 17) long, a thick sigmoid tube with expanded distal end; base with sclerotized borders, opening lateral to longitudinal axis of MCO. Accessory piece 70 (65–78; n= 17) long, articulated to MCO, composed by two branches, one branch rod shaped, distally expanded; another branch slightly flattened near midlength, distally bifid. Testis 50 long, 66 wide (n= 1), postgermarial; seminal vesicle a dilation of vas deferens; vas deferens looping left intestinal cecum. Germarium 40–54 (n= 2) long, irregular. Vitellaria in two bilateral fields of trunk, from pharynx to the posterior region of testes. Oviduct, ootype not observed. Metraterm conspicuous with sclerotized walls. Eggs not observed. Remarks. The new species is similar to Anacanthorus cuticulovaginus and A. biscuspidatus sp. n. considering that the accessory piece in all of these species is formed by two branches. Contrary to the other two species, however, one of the branches of the accessory piece of A. daulometrus sp. n. is bifid (not hook shaped as in A. bicuspidatus sp. n. nor simply pointed as in A. cuticulovaginus). Further differentiation of the new species is possible by the presence of a conspicuous metraterm with heavily sclerotized walls.Published as part of 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, pp. 57-68 in Zootaxa 3149 on pages 60-61, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
Tereancistrum arcuatus Cohen, Kohn & Boeger, 2012, sp. n.
No full textTereancistrum arcuatus sp. n. (Figs. 37–42) Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the localities of Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 21 ’’W), State of Paraná, Brazil Prevalence. 11.5% (3 of 26 fishes examined) Specimens studied. Holotype, CHIOC 37628; 5 paratypes, CHIOC 37609, 37665, 37674 a–b, 37678. Etymology. The new species refers to the arcuate shape of the male copulatory organ Description. (Based on 7 specimens). Body 358 (300–425; n= 3) long, 100 (n= 3) wide near midlength. Cephalic region broad, cephalic lobes moderately developed, with 3 pairs of lateral head organs; cephalic glands indistinct. Eyespots subequal, posterior pair with lenses, closer than the anterior pair. Pharynx 33 (n= 1) in diameter. Haptor subtrapezoidal, with 7 pairs of hooks, with ancyrocephaline distribution. Ventral bar 85 (82–92; n= 4) long, with subterminal constrictions and expanded ends. Dorsal bar 49 (45–54; n= 3) long, straight, rod–shaped, with slightly enlarged ends. Ventral anchor 65 (61–70; n= 8) long, with robust base, poorly distinguishable deep and superficial roots, evenly curved shaft and point, base width 28 (26–30; n= 6). Accessory anchor sclerite 37 (35–40; n= 5) long, with longitudinal groove, articulated to superficial root of ventral anchor. Dorsal anchor 53 (50–56; n= 8), with robust base, poorly differentiated roots, long straight shaft, short strongly recurved point; base width 19 (15–22; n= 7). Hook pair 1 15 (n= 2), pair 5 13–14 (n= 2), pairs 2–4, 6 – 7 22 (21–23; n= 7). Hook with depressed thumb, shaft, recurved point, shank of two portions, proximal portion enlarged. FH loop about 0.5 shank length. MCO 118 (105–138; n= 4) a strongly arcuate sclerotized tube with a small base and large distal flap. Accessory piece non-articulated, bifurcated, with pointed distal ends; branches of accessory piece connected near midlength by a flat sclerotized element. Vagina sinistral, marginal. Vitellaria scattered throughout the trunk except in the regions of copulatory complex and gonads. Eggs not observed. Remarks. Five species of Tereancistrum are presently known, each from fishes of different host families: T. kerri Kritsky, Thatcher & Kayton, 1980 from Brycon melanopterus (Cope), in Brazil, T. ornatus Kritsky, Thatcher & Kayton, 1980 from Prochilodus reticulatus Steindachner from Colombia, T. parvus Kritsky, Thatcher & Kayton, 1980 from Leporinus fasciatus (Bloch), T. toksonum Lizama, Takemoto & Pavanelli, 2004 and T. curimba Lizama, Takemoto & Pavanelli, 2004, both from Prochilodus lineatus (Valenciennes) in Brasil. The new species can be easily distinguished from the others by the MCO, which is an arcuate tube, while the other five species present a coiled copulatory organ.Published as part of 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, pp. 57-68 in Zootaxa 3149 on pages 66-67, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
Anacanthorus bicuspidatus Cohen, Kohn & Boeger, 2012, sp. n.
No full textAnacanthorus bicuspidatus sp. n. (Figs. 1–2) Type locality. Paraná River below and above of the reservoir of Itaipu Hydroelectric Power Station in the locality of Guaira (24 º04’ 48 ’’S, 54 º 15 ’ 21 ’’W), State of Paraná, Brazil Prevalence. 19.2% (5 out of 26 fishes examined) Specimens studied. Holotype, CHIOC 37595; 12 paratypes, CHIOC 37587–37588, 37598 a–b, 37600, 37604, 37612–37613, 37623, 37631, 37722, 37730. Etymology. The specific name is from Latin (bi = two, cuspidis = point) and refers to the presence of two pointed branches of the accessory piece. Description. (Based on 16 specimens). Body 711 (520–890; n= 9) long, 214 (130–290; n= 9) wide. Tegument smooth. Cephalic lobes well developed, usually 3, with up to 2 head organs each. Eyes 4, posterior pair larger than anterior pair; accessory granules scattered in cephalic region. Pharynx 54 (48–65; n= 9) long, 43 (40–50; n= 9) wide. Haptor 129 (98–158; n= 9) wide, slightly bilobed, with 7 pairs of hooks, with anacanthorine distribution. Anchors, bars absent. Hooks 19 (17–22; n= 18), with depressed thumb, curved shaft, short recurved point, shank proximally expanded; filamentous hook (FH) loop ¾ shank length. Dorsal, ventral pairs of 4 A hooks, splinter like. MCO 105 (97–112; n= 11) long, slightly sigmoid, with pointed projection at the distal opening; base with sclerotized borders, opening lateral to longitudinal axis of MCO. Accessory piece 67 (62–70; n= 11) long, articulated to Male copulatory organ (MCO) by a proximal process, rod-like, bifurcated; one branch rod-shaped distally pointed; other branch hook-like, with flattened, subterminal thumb-like projection. Testis postgermarial, 68–85 long, 34–80 wide (n= 2); seminal vesicle a dilation of vas deferens; two prostatic reservoirs lying beneath copulatory organ; vas deferens looping left intestinal cecum. Germarium 62 (50–80; n= 4) long, round. Vitellaria in two bilateral fields of trunk from pharynx to the posterior region of testes, coextensive with intestinal ceca. Oviduct, ootype not observed. Metraterm with delicate wall, non-sclerotized. Eggs not observed. Remarks. The new species has great similarity to Anacanthorus cuticulovaginus Kritsky & Thatcher, 1974 (a parasite of Salminus affinis from the Rio Cauca-Rio Magdalena Basin, Colombia) based on the general morphology of hooks, MCO and copulatory complex. The new species can be easily differentiated from A. cuticulovaginus by presenting one of the rami hook shaped and with a subterminal thumb-like expansion (both pointed in A cuticulovaginus), MCO more delicate and slender, with distal point (MCO more robust and distally wide, funnel shaped in A. cuticulovaginus).Published as part of 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, pp. 57-68 in Zootaxa 3149 on pages 58-59, DOI: 10.11646/zootaxa.3149.1.3, http://zenodo.org/record/21456
- …
