taxonID	type	description	language	source
2425637F8E7DFFF4FF7FFAB181AF4A09.taxon	diagnosis	Diagnosis (after N’Douba et al. 1997): Four cephalic lobes (2 lateral, 2 anterior). Three pairs of single-celled head glands. Four eye spots with large sub-spherical granules; mid-ventral sub-terminal mouth; pharynx present. Two intestinal branches united posteriorly. Haptor with a pair of ventral anchors and a pair of dorsal anchors, two transverse bars (one dorsal and one ventral), 14 hooks. Ventral anchors with a protuberance at the base of the guard (external root or superficial root) to which the filament attaches. Dorsal and ventral bars with or without lateral horns and medial expansion. Testis posterior to ovary, between the intestinal branches. Vas deferens surrounding the left intestinal branch, fusiform seminal vesicle, elongated parallel to the left intestinal branch, vas deferens slightly dilated at its distal end. A prostate reservoir associated with the base of the MCO. Tubular MCO and complex accessory part joined by a rod at the base of the MCO. Massive median pre-testicular ovary. Vagina with right lateral opening and partially sclerotised wall. Ventral seminal receptacle. Lateral vitellogenic glands surrounding the intestinal branches dorsally and ventrally. Gill parasites of Schilbeidae (Siluriformes) from Africa. Type species: Schilbetrema quadricornis Paperna & Thurston, 1968. Type host: Schilbe intermedius Rüppell, 1883.	en	Bassock Bayiha, Etienne D., Bahanak, Dieu ne dort, Mbondo, Jonathan A., Nack, Jacques, Pariselle, and Antoine (2025): Four new species of Schilbetrema (Monogenea: Dactylogyridae) from Schilbe spp. (Siluriformes: Schilbeidae) in the Sanaga River (Sanaga Basin) and Boumba River (Congo Basin) in Cameroon. Zoologia (e 24067) 42: 1-12, DOI: 10.1590/S1984-4689.v42.e24067, URL: https://doi.org/10.1590/s1984-4689.v42.e24067
2425637F8E7DFFF2FCCCFBC1878648AF.taxon	description	Fig. 3, Table 2 https: // zoobank. org / 47 A 10 CE 7 - 8 BA 9 - 4699 - A 8 F 3 - 42 F 4 E 2 D 3 D 2 C 3 Type host: Schilbe mystus (Linnaeus, 1758). Number of hosts examined: 10. Site: Gill lamellae. Prevalence: 40 %. Mean intensity: 2.3 ± 2.4. Type locality: Nachtigal (04 ° 21 ’ 10.5 ” N; 11 ° 37 ’ 34.9 ” E, alt. 432 m). Sp ecimens dep osited: Holotyp e RMCA _ VERMES _ 43400 and Paratypes RMCA _ VERMES _ 43401 – 43404. Description based on six individuals: Dorsal anchors (DA) each with a straight blade, a very short and thick outer root (deep root, dorsal root, shaft), an elongate inner root (superficial root, ventral root, guard) longer than the outer root, a thick filament that covers the blade, a curved tip. Dorsal bar (DB) in form of a dumbbell, presents a small me- 2. Mean and ranges of measurements of Schilbetrema bilongi sp. nov., Schilbetrema ducentesimum sp. nov., Schilbetrema sanagaensis sp. nov., Schilbetrema asambaensis sp. nov. and selected other species of Schibetrema. dio-anterior projection and a fenestration at each extremity. Ventral anchors (VA), smaller than DAs, with a long blade, a small knob at the base of the inner root, a curved point. Ventral bar (VB) with short bilateral, posteriorly directed horns, T-shaped antero-median process with accessory structure (V-shaped) articulated to the point. Haptor is armed with seven pairs of hooks, similar in shape (each with truncate thumb, delicate point, slender shank) (even in size). MCO coiled (4 turns). Accessory piece made up of a proximal curved part followed by a distal end composed of digitiform process (5 finger-shaped expansions). Coiled vagina (3 turns). The mean and range of measurements of the new species and the sclerotised parts are shown in Table 2. Etymology: Epithet bilongi is given in honor of late Pr. Charles F. Bilong Bilong, who worked during decades on African (mainly Cameroonian) fish monogeneans. Remarks. Schilbetrema bilongi sp. nov. is morphologically similar to Schilbetrema spirocirra Paperna, 1969 from S. mystus (syn. Eutropius niloticus) by the morphology of the MCO (spiral shaped). However, the new species is mainly distinguishable by the morphology of the dorsal bar (lack of lateral projections in the new species vs presence of lateral projections in the other species; short median projection vs long median projection), the ventral bar (accessory sclerite point shaped associated with antero-median projection vs antero-median process with large sub-triangular accessory structure articulated to tip); and by the length of the dorsal anchor (80 – 83 vs 50 – 61), the accessory piece (30 – 45 vs 60 – 71), and (5) the number of turns of the MCO (4 vs 7 – 9), respectively.	en	Bassock Bayiha, Etienne D., Bahanak, Dieu ne dort, Mbondo, Jonathan A., Nack, Jacques, Pariselle, and Antoine (2025): Four new species of Schilbetrema (Monogenea: Dactylogyridae) from Schilbe spp. (Siluriformes: Schilbeidae) in the Sanaga River (Sanaga Basin) and Boumba River (Congo Basin) in Cameroon. Zoologia (e 24067) 42: 1-12, DOI: 10.1590/S1984-4689.v42.e24067, URL: https://doi.org/10.1590/s1984-4689.v42.e24067
2425637F8E7AFFF0FF08FB91873F487C.taxon	description	Fig. 4, Table 2 https: // zoobank. org / E 6432 CE 4 - 6 BD 7 - 47 B 6 - AFD 4 - 245441475749 Type host: Schilbe mystus. Number of hosts examined: 10. Site: Gill lamellae. Prevalence: 40 %; mean intensity: 10.1 ± 10. Type locality: Zoulabot (03 ° 18.740 ’ N; 14 ° 04.701 ’ E, alt. 576 m). Specimensdeposited: HolotypeRMCA _ VERMES _ 43405; Paratypes RMCA _ VERMES _ 43406 – 43409. Description based on eighth individuals: Dorsal anchors: each with a straight blade, a short outer root, a short and narrow inner root (superficial root, ventral root, guard), and a thick filament, a curved point. Dorsal bar made up of a dumbbell-shaped piece covering a M-shaped structure associated to two light sclerotised parts not yet observable in Schilbetrema and whose origin are unknown. Ventral anchors with a long blade, a small knob at the base of the inner root, a curved point. Ventral bar with elongate bilateral horns, slightly sclerified at their rounded ends, antero-median T-shaped projection, pear-shaped structure associated with tip of antero-median projection. Haptor is armed with seven pairs of hooks, similar in shape (each with truncate thumb, delicate point, slender shank) (even in size) to those of ancyrocephaline oncomiracidia (larval hooks). MCO, tubular, U-shaped and attached to the accessory piece at its proximal part. Accessory piece, straight then digitiform (3 to 4 fingers) at the distal part. Vagina tubular and coiled or sigmoid. The mean and range of measurements of the new species and the sclerotised parts are shown in Table 2. Etymology: Epithet ducentesimum (Latin for “ two hundredth ”) refers to the fact that the species represents the two-hundredth taxon described by the senior author (A. P.). Remarks. By the morphology of the ventral bar (T-shaped, with pear-shaped structure associated with tip of antero-median projection), and the MCO (U-shaped), S. ducentesimum sp. nov. is close to Schilbetrema hexacornis Paperna, 1969 (which has also been described from S. mystus in Ghana). The morphology of the dorsal bar (M-shaped) of S. ducentesimum sp. nov is similar to that of the new species (S. sanagaensis sp. nov. and S. asambaensis sp. nov.). Schilbetrema ducentesimum sp. nov. differs to S. hexacornis mainly by: (1) the morphology of dorsal bar, which is formed by a single structure in S. hexacornis and other species of Schilbetrema vs two parts (one M-shaped and another part straight and dumbbell shaped) in S. ducentesimum sp. nov.; (2) the length of dorsal anchor (101 – 108 vs 75 – 93) and the MCO (148 – 177 vs 81 – 92); (3) the presence of two lightly sclerotised parts in S. ducentesimum sp. nov. vs absent or not seen by Paperna (1969) in S. hexacornis. It differs to S. sanagaensis sp. nov. and S. asambaensis sp. nov. mainly by: (1) morphology of MCO (U-shaped in S. ducentesimum sp. nov. and J-shaped in S. sanagaensis sp. nov. and S. asambaensis sp. nov.); (2) MCO length (148 – 177 vs 66 – 73 in S. sanagaensis sp. nov., 42 – 50 in S. asambaensis sp. nov.).	en	Bassock Bayiha, Etienne D., Bahanak, Dieu ne dort, Mbondo, Jonathan A., Nack, Jacques, Pariselle, and Antoine (2025): Four new species of Schilbetrema (Monogenea: Dactylogyridae) from Schilbe spp. (Siluriformes: Schilbeidae) in the Sanaga River (Sanaga Basin) and Boumba River (Congo Basin) in Cameroon. Zoologia (e 24067) 42: 1-12, DOI: 10.1590/S1984-4689.v42.e24067, URL: https://doi.org/10.1590/s1984-4689.v42.e24067
2425637F8E79FFF1FF23F9F4810B48AF.taxon	description	Fig. 5, Table 2 https: // zoobank. org / 9856 D 7 C 2 - 34 AF- 420 F- 9 A 3 D-FA 108 F 6 BCC 52 Type host: Schilbe mystus. Number of hosts examined: 10. Site: Gill lamellae. Prevalence: 60 %; mean intensity: 3.7 ± 1.1. Type locality: Nachtigal (4 ° 21 ’ 10.5 ” N; 11 ° 37 ’ 34.9 ” E, alt. 432 m). Specimens deposited: Holotype RMCA _ VERMES _ 44357; Paratypes RMCA _ VERMES _ 44358 – 44359. Description based on seven individuals: Dorsal anchors: each has a long straight blade, a short and thick outer root (deep root, dorsal root, shaft) separated by a slight depression from the inner root (superficial root, ventral root, guard) three times longer, a thick filament covers the blade, a curved point. Dorsal bar composed of a dumbbell-shaped part and an M-shaped part with 3 expansions, which are associated with two slightly sclerotised parts. The ventral anchors with a long blade, a small knob at the base of the inner root, a curved point. The ventral bar with elongate bilateral horns, T-shaped antero-median process. Haptor is armed with seven pairs of hooks, similar in shape (each with truncate thumb, delicate point, slender shank) (even size); J-shaped MCO attached by its flared base to the accessory piece; the latter ends with a notch at its distal extremity. Sclerotised vagina not observed in this species. The mean and range of measurements of the new species and the sclerotised parts are shown in Table 2. Etymology: Epithet sanagaensis refers to the Sanaga River where the type host individual was sampled from. Remarks. Based on the morphology of the dorsal bar (dumbbell-shaped piece covering a M-shaped structure) and ventral anchors (blade morphology), S. sanagaensis sp. nov. resembles S. ducentesimum sp. nov., parasite of the same host species. Both species differ mainly by the morphology of: (1) the dorsal anchors with longer inner root in S. sanagaensis sp. nov. vs short inner root in S. ducentesimum sp. nov.; (2) distal portion of ventral anchor: heavily sclerotised in S. sanagaensis sp. nov. vs slightly sclerotised in S. ducentesimum sp. nov.; (3) the distal extremity of the accessory piece with a notch in S. sanagaensis sp. nov. vs digitiform (3 to 4 fingers) in S. ducentesimum sp. nov. and by the length of: (4) the MCO, (66 – 73 in S. sanagaensis sp. nov. vs 148 – 177 in S. ducentesimum sp. nov.); (5) the dorsal anchors, (a = 73 – 89 in S. sanagaensis sp. nov. vs a = 101 – 108 in S. ducentesimum sp. nov.).	en	Bassock Bayiha, Etienne D., Bahanak, Dieu ne dort, Mbondo, Jonathan A., Nack, Jacques, Pariselle, and Antoine (2025): Four new species of Schilbetrema (Monogenea: Dactylogyridae) from Schilbe spp. (Siluriformes: Schilbeidae) in the Sanaga River (Sanaga Basin) and Boumba River (Congo Basin) in Cameroon. Zoologia (e 24067) 42: 1-12, DOI: 10.1590/S1984-4689.v42.e24067, URL: https://doi.org/10.1590/s1984-4689.v42.e24067
2425637F8E77FFFEFF3FFF7580DD4EAB.taxon	description	Fig. 6, Table 2 https: // zoobank. org / 1 CD 3695 F- 7879 - 49 A 2 - AA 22 - AFDBB 400910 A Type host: Schilbe intermedius (Rüppel, 1832). Number of hosts examined: 8. Site: Gill lamellae. Prevalence: 40 %; mean intensity: 1.5 ± 1. Type locality: Asamba River (Sanaga Basin) at Djore (04 ° 26.01 ’ N; 11 ° 47 ’ E, alt. 541 m). Specimens deposited: Holotype RMCA _ VERMES _ 44353; Paratypes RMCA _ VERMES _ 44354 – 44356. Description based on six individuals: Dorsal anchors: each has a long straight blade with a long point, a short and thick outer root (deep root, dorsal root, shaft), an inner root (superficial root, ventral root, guard) much longer than the handle, a curved point. Dorsal bar is chevron-shaped with three anterior projections: two laterals longer and one median shorter. Ventral anchors with a long blade, a small knob at the base of the inner root, a curved point; are smaller than the dorsal ones. Ventral bar similar to that of S. sanagaensis sp. nov., but lacks the tip associated with the antero-median process. Haptor is armed with seven pairs of hooks, similar in shape (each with truncate thumb, delicate point, slender shank) (even size). J-shaped MCO connected at the base to a thin accessory piece; accessory piece with a distal tunnel-shaped foramen, crossed by the MCO, and small hook at its distal extremity. Sclerotised vagina not observed in this species. The mean and range of measurements of the new species and the sclerotised parts are shown in Table 2. Etymology: Epithet asambaensis refers to the Asamba River where individuals of the type host species were sampled from. Remarks. The new species resembles S. eutropii Paperna, 1969 parasite of S. mystus and S. calamocleithrum Kritsky & Kulo, 1992 parasite of S. intermedius, by the morphology of dorsal anchors (long straight blade and inner root tapered in its distal part) and dorsal bar (M-shaped for the two species). Schilbetrema asambaensis sp. nov. differs from S. calamocleithrum by the morphology of (1) the accessory piece (1 hook at distal extremity vs 2), (2) the ventral bar (lacks the tip associated with the antero-median process vs accessory ventral bar sclerite subtriangular with thickened margins), and by (3) the MCO length (42 – 50 vs 61 – 78), respectively. Schilbetrema asambaensis sp. nov. differs from S. eutropii by (1) the morphology of ventral bar (lacks the tip associated with the antero-median process vs accessory sclerite associated with antero-median process; and (2) the MCO length (42 – 50 vs 58 – 70) respectively.	en	Bassock Bayiha, Etienne D., Bahanak, Dieu ne dort, Mbondo, Jonathan A., Nack, Jacques, Pariselle, and Antoine (2025): Four new species of Schilbetrema (Monogenea: Dactylogyridae) from Schilbe spp. (Siluriformes: Schilbeidae) in the Sanaga River (Sanaga Basin) and Boumba River (Congo Basin) in Cameroon. Zoologia (e 24067) 42: 1-12, DOI: 10.1590/S1984-4689.v42.e24067, URL: https://doi.org/10.1590/s1984-4689.v42.e24067
