Schilbetrema sanagaensis Bassock Bayiha, Nack & Pariselle, 2025

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, pp. 1-12 : 7-8

publication ID	https://doi.org/10.1590/S1984-4689.v42.e24067
DOI	https://doi.org/10.5281/zenodo.16970222
persistent identifier	https://treatment.plazi.org/id/2425637F-8E79-FFF1-FF23-F9F4810B48AF
treatment provided by	Felipe
scientific name	Schilbetrema sanagaensis Bassock Bayiha, Nack & Pariselle
status	sp. nov.

Treatment

Schilbetrema sanagaensis Bassock Bayiha, Nack & Pariselle sp. nov.

Fig. 5 View Figure 5 , Table 2

https://zoobank.org/ 9856D7C2-34AF-420F-9A3D-FA108F6BCC52

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.).