taxonID	type	description	language	source
35568782FF9282729CD696BCFE75FD2A.taxon	description	(Figure 2, Figure 6 A, B) Type-host: Knodus guajajara Aguiar, Brito, Ottoni & Guimarães, 2022 (Characiformes, Stevardiidae) Type-Locality: Estrela Stream, balneary of Anapurus, urban zone of the municipality of Anapurus, Munim River Basin, Maranhão State, northeastern Brazil (03 ° 40 ' 15.6 " S 043 ° 7 ' 9.7 " W). Parasitological indices: Total number of hosts examined: 53; number of infested hosts: 1; total number of specimens: 5.	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9282729CD696BCFE75FD2A.taxon	etymology	Etymology: The specific epithet refers to the scientific name of the host, Knodus guajajara. The Guajajara are one of the main indigenous peoples in Brazil, inhabiting the eastern margin of the Amazon. Specimens deposited: Holotype CHIOC 40867 a; Paratypes CHIOC 40867 b-e	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9282729CD696BCFE75FD2A.taxon	description	Description (Based on 5 specimens mounted in Hoyer’s medium). Body filiform, flattened dorsoventrally, 423 (400 – 460; n = 4) long by 209 (180 – 245; n = 4) greatest width. Tegument thin and smooth. Cephalic lobes moderately developed; three bilateral pairs of head organs; cephalic glands indistinct. Two pairs of eyes equidistant, anterior pair smaller than posterior. Pharynx spherical 40 (34 – 45; n = 3) in diameter; oesophagus short; two intestinal caeca, confluent posteriorly to gonads, without diverticula. Gonads overlapping, intercaecal; testis, dorsoposterior to germarium. Vaginal aperture sinistral (Fig. 2 A); vagina consisting of a sclerotized tube with wide bevel-shaped opening; seminal receptacle with irregular edges (Fig. 2 C). Vitelline follicles distributed throughout the trunk but absent in the regions surrounding the reproductive organs. Egg 49 long by 44 wide (n = 1). Mehlis’ gland and oötype not observed. Copulatory complex comprising male copulatory organ (MCO) and accessory piece. Male copulatory organ as a coiled sclerotized tube counterclockwise, with 1 ½ rings, 86 (61 – 102, n = 5) in total length; first ring 20 (16 – 25, n = 5) in diameter; base forming a small tube with two circular flanges. Accessory piece consisting of two large, articulated subunits: a concave anterior part and a posterior part formed by three tubular-looking structures at proximal portion; apparently serving as a support for the anterior part, the second tube serves as a guide for the MCO, 28 (23 – 30, n = 4) long (Figs. 2 B, 6 B). Peduncle short. Haptor subhexagonal 98 (80 – 120; n = 5) wide, with anchor / bar complex, and 7 pairs of hooks (Figs. 2 A, 6 A). Anchors of different size, similar in shape, with intermediate root between superficial and deep roots, more prominent in dorsal anchor; superficial and deep roots well developed; superficial root elongated, subrectangular shape, slightly straight stem, short tip. Ventral anchor, 29 (27 – 31, n = 8) long, base 15 (13 – 16, n = 8) wide (Figs. 2 D, 6 A); dorsal anchor, 22 (20 – 23, n = 8) long, base 12 (9 – 13, n = 8) wide (Figs. 2 E, 6 A). Ventral bar robust, open V-shaped, 30 (29 – 32, n = 4) long (Figs. 2 F, 6 A); dorsal bar straight, with the expanded ends slightly turned backwards, 37 (31 – 45, n = 4) long (Figs. 2 G, 6 A). Hooks similar in shape, with rounded thumb, delicate shaft and tip; shank composed of two subunits, proximal subunit very short, representing about 15 % of the total shaft size: Pairs 1 and 5, 13 (10 – 14, n = 16) long, pairs 2 and 4, 16 (14 - 17, n = 8) long, pairs 3, 6, and 7, 17 (14 – 19, n = 17) long. Filamentous hook loop approximately 50 % of the shank length (Figs. 2 H-J, 6 A).	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9282729CD696BCFE75FD2A.taxon	discussion	Remarks: Diaphorocleidus guajajara sp. nov. was assigned to the genus Diaphorocleidus based on the overlapping gonads, submarginal sinistral vaginal pore; a copulatory complex comprising an unarticulated MCO; accessory piece with variable shapes divided into subunits; vaginal aperture sinistral, and ventral anchor larger than the dorsal anchor. By the number of rings of the MCO (1 ½ counterclockwise), the new species resembles Diaphorocleidus kabatai (Molnar, Hanek, and Fernando, 1974) Jogunoori, Kritsky and Venkatanarasaiah, 2004, Diaphorocleidus petrosusi Mendoza-Franco, Aguirre-Macedo & Vidal-Martínez, 2007, Diaphorocleidus neotropicalis Zago, Franceschini, Abdallah, Müller, Azevedo & da Silva, 2021, but differs from these in the accessory piece, which in the new species consists of two large articulated subunits, one of them being formed by three tubular-like structures at the base. The new species resembles Diaphorocleidus forcipiformis Silva, Meneses, Cohen & Justo, 2024, Diaphorocleidus microstomus (Mizelle, Kritsky & Crane, 1968) Jogunoori, Kritsky & Venkatanarasaiah, 2004, and Diaphorocleidus munimensis Silva, Meneses, Cohen & Justo, 2024 by the presence of a middle root between superficial and deep roots, more prominent in the dorsal anchor, but differs in most other morphological structures. The hook pairs of the new species are unique among the species of Diaphorocleidus, with a shaft that is robust throughout its length, ending with a small, rounded portion at the end, representing about 15 % of the total shaft size.	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582739CD693E8FE87F91A.taxon	description	(Figure 3, Figure 6 C, D) Type-host: Knodus guajajara Aguiar, Brito, Ottoni & Guimarães, 2022 (Characiformes, Stevardiidae) Type-Locality: Estrela Stream, balneary of Anapurus, urban zone of the municipality of Anapurus, Munim River Basin, Maranhão State, northeastern Brazil (03 ° 40 ' 15.6 " S 043 ° 7 ' 9.7 " W). Parasitological indices: Total number of hosts examined: 53; number of infested hosts: 1; total number of specimens: 4.	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582739CD693E8FE87F91A.taxon	etymology	Etymology: The specific epithet honors Dr. Delane C. Kritsky of Idaho State University in recognition of his outstanding contributions to the taxonomy and systematics of dactylogyrid parasites. Specimens deposited: Holotype CHIOC 40868 a; Paratypes CHIOC 40868 b-d	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582739CD693E8FE87F91A.taxon	description	Description: (Based on 4 specimens mounted in Hoyer’s medium). Body robust, flattened dorsoventrally, 318 (250 – 370; n = 4) long by 166 (80 – 200, n = 4) greatest width. Tegument thin and smooth. Cephalic lobes moderately developed; three bilateral pairs of head organs; cephalic glands indistinct. Two pairs of eyes, equidistant, anterior pair smaller than posterior. Pharynx spherical 40 in diameter; oesophagus short; two intestinal caeca, confluent posteriorly to gonads, without diverticula. Gonads overlapping, intercaecal; testis, posterior to germarium. Vaginal aperture sinistral; vagina consisting of a sclerotized tube with wide opening; seminal small receptacle with irregular edges (Fig. 3 B). Vitelline follicles distributed throughout the trunk, absent in the regions surrounding the reproductive organs. Mehlis’ gland and oötype not observed. Copulatory complex comprising male copulatory organ (MCO) and accessory piece. Male copulatory organ as a coiled sclerotized tube, counterclockwise, with 1 ½ rings 80 (62 – 91, n = 4) in total length; first ring 18 (17 – 20, n = 4) in diameter; base tubular with subdivided flange. Accessory piece consisting of two large subunits: anterior subunit curved, with a hook-shaped distal part, where it apparently articulates with the other subunit; second subunit robust as Y-shaped, with irregular base, serves as a guide for the MCO, 24 (20 – 29, n = 4) long (Figs. 3 A, 6 D). Peduncle short. Haptor sub hexagonal 98 (70 – 162; n = 4) wide, with anchor / bar complex, 14 pairs of hooks. Anchors dissimilar in size. Ventral anchor with well-developed superficial and deep roots; superficial root elongated, sub rectangular shape, deep root pointed, round, slightly straight shaft, point, 22 (19 – 26, n = 8) long, base 14 (12 – 16, n = 8) wide (Figs. 3 C, 6 C); dorsal anchor with straight superficial root, pointed deep root, short shaft and straight elongated point, 16 (14 – 20, n = 8) long, base 11 (9 – 12, n = 8) wide (Figs. 3 D, 6 C). Ventral bar V-shaped 26 (25 – 27, n = 4) long (Figs. 3 E, 6 C); Dorsal bar straight, 33 (28 – 35, n = 4) long (Figs. 3 F, 6 C). Hooks dissimilar in shape and size. Pairs 1 and 5, 13 (12 – 15, n = 6) long with straight shank, straight thumb, delicate shaft and tip; FH loop not observed (Fig. 3 G); pair 2, 3, 4, 6 and 7, 16 (15 – 20, n = 25) long, shaft composed of two subunits: robust distal subunit with constriction in the medial region; proximal subunit very short, representing about 10 % of the total shaft size. Filamentous hook loop approximately 0.2 of the shank length (Figs. 3 H, 6 C).	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582739CD693E8FE87F91A.taxon	discussion	Remarks: The new species presented the characteristics typical of the genus. Considering the number of rings of the MCO, approximately 1 ½ - 2 counterclockwise, and the accessory piece divided into two subunits, the new species is similar to Diaphorocleidus affinis (Mizelle, Kritsky & Crane, 1968), Diaphorocleidus forficata Santos-Neto, Paixão & Domingues, 2024, Diaphorocleidus guajajara sp. nov., Diaphorocleidus magnus Zago, Franceschini, Abdallah, Müller, Azevedo & Silva, 2021, D. munimensis, D. neotropicalis, and D. petrosusi. However, D. kritskyi sp. nov. can be easily distinguished from all previously cited species mainly by the unique morphology of the hooks, which possess a robust shaft with a pronounced constriction in the medial region, not observed in any other species of the genus to date.	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582719CD6944CFA75F866.taxon	description	(Figure 4, Figure 6 E, F) Type-host: Steindachnerina notonota (Miranda Ribeiro, 1937) (Characiformes, Curimatidae) Type-locality: Estrela Stream, balneary of Anapurus, urban zone of the municipality of Anapurus, Munim River Basin, Maranhão State, northeastern Brazil (03 ° 40 ' 15.6 " S 043 ° 7 ' 9.7 " W). Parasitological indices: Total number of hosts examined: 12; number of infested hosts: 5; total number of specimens: 11.	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582719CD6944CFA75F866.taxon	etymology	Etymology: This species was named in tribute to Dr. J. D. Mizelle (Washington State University, Roche Harbor, Washington), acknowledging his extensive work on monopisthocotylean parasites, especially within the Neotropical region. Specimens deposited: Holotype CHIOC 40872 a; Paratypes CHIOC 40872 b-c, 40873, 40874	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582719CD6944CFA75F866.taxon	description	Description: (Based on 11 specimens mounted in Hoyer’s medium). Body fusiform, 220 (125 – 275, n = 10) long by 125 (90 – 265, n = 11) wide. Three pairs of cephalic glands. Eyespots absent. Pharynx ovate; oesophagus short; two intestinal caeca, confluent posteriorly to gonads, without diverticula. Gonads overlapping, intercaecal; testis dorsal to germarium; seminal vesicle a distal dilation of vas deferens; single prostatic reservoir present. Germarium elongated. Vaginal pore sinistral (Fig. 4 A); vagina consisting of a sclerotized tube with cone-shaped opening; seminal receptacle not visualized (Fig. 4 A). Vaginal sclerite robust and very large, with a longitudinal groove in the middle, depressed thumb, 25 (22 – 28, n = 7) long (Fig. 4 C). Vitellaria present, heavily distributed throughout the body, except in reproductive organs. Mehlis’ gland and oötype not observed. Copulatory complex comprising male copulatory organ (MCO) and accessory piece. Male copulatory organ as a coiled sclerotized tube, counterclockwise, with 2 ½ rings, 56 (42 – 62, n = 9) in total length; first ring 10 (8 – 12, n = 9) in diameter, base tubular. Accessory piece rod-shaped, enlarging and dividing into two delicate bulbous structures at distal portion, not articulated at the base of the MCO, 9 (8 – 10, n = 9) long (Figs. 4 B, 6 F). Peduncle short. Haptor subhexagonal 75 (50 – 95; n = 10) wide (Figs. 4 A, 6 E). Dorsal and ventral anchor with a rectangular-shaped superficial root and deep root distally round, straight shaft in the ventral anchor, evenly curved shaft in the dorsal anchor and acute point, not exceeding base width. Ventral anchor 20 (18 – 23, n = 11) long; base 13 (11 – 15, n = 11) wide (Figs. 4 D, 6 E); dorsal anchor 19 (17 – 20, n = 11) long, base 12 (11 – 13, n = 11) wide (Figs. 4 E, 6 E). Ventral bar straight and robust, with expanded ends, 25 (22 – 30, n = 10) long (Figs. 4 F, 6 E). Dorsal bar Y-shaped, 36 (20 – 40, n = 11) long, with a long posteromedian projection (Figs. 4 G, 6 E). Hooks dissimilar in shape and size. Pairs 1 and 5 smaller than others, protruded thumb, curved point, shank straight 9 (8 – 9, n = 20) long (Figs. 4 H, 6 E). Pairs 2, 3, 4, 6, and 7 divided into two subunits, protruded thumb, curved point, shank straight with proximal dilation, comprising ⅔ of shank length, 15 (14 – 17, n = 20) long; FH loop 0.5 of shank length (Figs. 4 I, 6 E).	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF9582719CD6944CFA75F866.taxon	discussion	Remarks: The new species is assigned to Urocleidoides by the presence of the vaginal sclerite, and hook pairs 1 and 5 of reduced size. Of the 63 valid species of the genus, only 14 present a long posteromedian projection on the dorsal bar (Table 1), a morphological feature also observed in the new species. However, the new species differs from all these species mainly in the morphology of the copulatory complex, considering the accessory piece dividing into two delicate bulbous structures at distal portion. Considering the morphology of the anchors and the number of rings of the male copulatory organ (MCO), the new species shows similarities with Urocleidoides saghirus Yamada, Osaki-Pereira & Silva, 2024, differing from the latter by presenting a longer and thinner ventral bar, in contrast to the ventral bar of U. saghirus, which is recurved and robust. Furthermore, the vaginal sclerite in the new species is considerably larger (25, 22 – 28) than that observed in U. saghirus (10, 9 – 14). localities and references ...... continued on the next page	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF98827D9CD69586FE71FC96.taxon	description	(Figure 5, Figure 6 G, H, I) Type-host: Steindachnerina argentea (Gill, 1858) (as Curimata argentea Gill) (Characiformes, Curimatidae). Type-locality: Arouca River, Trinidad. Other hosts: Cyphocharax nagelii (Vieira et al. 2013), Steindachnerina notonota (Miranda Ribeiro, 1937) [present study] Other localities: Peixe River, Anhembi, São Paulo State, southeast Brazil (Vieira et al. 2013), Estrela Stream, balneary of Anapurus, urban zone of the municipality of Anapurus, Munim River Basin, Maranhão State, northeastern Brazil (03 ° 40 ' 15.6 " S 043 ° 7 ' 9.7 " W) [present study]. Parasitological indices: Total number of hosts examined: 12; number of infested hosts: 5; total number of specimens: 22. Specimens deposited: Voucher CHIOC 40869 a-b, 40870 a-d, 40871 a-c	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF98827D9CD69586FE71FC96.taxon	materials_examined	New data from 22 specimens collected and mounted in Hoyer’s medium. Body short, broad, 206 (150 – 250, n = 20) long, 159 (85 – 280, n = 20) wide. Tegument smooth. Cephalic region with 4 pairs of lateral lobes well defined; 5 pairs of head organs; cephalic glands not visualized. Eyes 4, anterior pair smaller than posterior pair. Pharynx rounded, muscular, 20 (n = 4) in diameter; oesophagus short. Peduncle inconspicuous. Haptor, 84 (50 – 120, n = 21) wide (Fig. 5 A). Ventral bar thin and irregular, 25 (17 – 34, n = 8) long (Figs. 5 D, 6 G). Ventral anchor with moderately developed deep root and well-developed superficial root; shaft slightly curved, with straight distal point, 17 (13 – 20, n = 42) long, base, 11 (10 – 14, n = 42) (Figs. 5 F, 6 G). Dorsal anchor complex heavily modified, composed of 2 subunits: dorsal-median and dorsal. Dorsal-median subunit elongated, curved, tip ending in a stout hook 27 (21 – 39, n = 44) long, with deep roots poorly developed 18 (10 – 28, n = 44) long, superficial root inconspicuous (Figs. 5 G, 6 G). Dorsal subunit elongated, thin anterior region, expanding in the anterior third and ending in two foot-shaped structures, one of them with a hook on the side; superficial and deep roots absent, 26 (30 – 45, n = 32) long (Figs. 5 H, 6 H). Hooks similar in shape, with small distal bulbous base, elongated slender shank, protruding thumb, and curved shaft; FH loop approximately 20 % of the shank length. Pairs 1, 5: 8 (6 – 9, n = 36) long; pairs 2, 3, 4, 6, and 7: 10 (8 – 10, n = 38) long (Figs. 5 E, 6 G). Copulatory complex comprising male copulatory organ (MCO) and articulated accessory piece. Male copulatory organ tubular, sclerotized, with a base robust and tubular, 25 (15 – 31, n = 17) in total length; accessory piece with two-unit process, jar-shaped with a long, thin neck, apparently connected to base of MCO length, 27 (15 – 35, n = 10) long (Figs. 5 B, 6 I). Testis oval, dorsal to the germarium; seminal vesicle formed by a distal enlargement of the vas deferens; prostatic reservoir single. Germarium pretesticular (Fig. 5 A). Vagina sinistral cup-shaped; vaginal canal wall sclerotized (Fig. 5 C); vaginal aperture between germarium and MCO; oviduct, oötype, uterus, and eggs not observed. Vitellaria dense extends over the entire body, except in the region of the reproductive organs and haptor (Fig. 5 A).	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
35568782FF98827D9CD69586FE71FC96.taxon	discussion	Remarks: The morphological characteristics of the specimens of the present study demonstrate similarities with C. hexacleidus, considering the morphology of the copulatory complex. A comparison between the specimens examined in the present study and the original description revealed morphological differences, especially in the morphology of the haptoral sclerites. Hanek et al. (1974) described the dorsal-median subunit as having a well-developed superficial root. In contrast, the present analysis indicates that the more developed root is the deep root. Differences were also observed in the morphology of the dorsal subunit, which was originally described as elongated, lacking a deep root, and ending in a sickle-shaped tip. In the specimens of the present study, however, the dorsal subunit is elongated with a narrow anterior region that expands into the anterior third and terminates in two foot-shaped structures, one of which bears a lateral hook. Additional morphological variations were observed in the hook structure. In the present specimens, the hooks exhibit a small bulbous region at the distal end. Moreover, the smallest pairs of hooks in our study were pairs 1 and 5, whereas in the original description, they were reported as pairs 6 and 7. These differences are believed to result from the limiting conditions under which the species was originally discovered.	en	Justo, Marcia Cristina Nascimento, Silva, Marciara Lopes, Ottoni, Felipe Polivanov, Mendonça, Gabriela Cristina De França, Nigris, Giovanna Oliveira De, Cohen, Simone Chinicz (2025): New species of Diaphorocleidus and Urocleidoides with a redescription of Curvianchoratus hexacleidus (Monopisthocotyla: Dactylogyridae) parasitizing characiform fishes from the Munim River Basin, northeastern Brazil. Zootaxa 5729 (1): 135-150, DOI: 10.11646/zootaxa.5729.1.5, URL: https://doi.org/10.11646/zootaxa.5729.1.5
