Schilbetrema asambaensis 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 : 9

publication ID	https://doi.org/10.1590/S1984-4689.v42.e24067
DOI	https://doi.org/10.5281/zenodo.16970225
persistent identifier	https://treatment.plazi.org/id/2425637F-8E77-FFFE-FF3F-FF7580DD4EAB
treatment provided by	Felipe
scientific name	Schilbetrema asambaensis Bassock Bayiha, Nack & Pariselle
status	sp. nov.

Treatment

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

Fig. 6 View Figure 6 , Table 2

https://zoobank.org/ 1CD3695F-7879-49A2-AA22-AFDBB400910A

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) GoogleMaps .

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.