Cichlidogyrus djietoi, Pariselle, Antoine, Bitja Nyom, Arnold R. & Bilong Bilong, Charles F., 2014

Pariselle, Antoine, Bitja Nyom, Arnold R. & Bilong Bilong, Charles F., 2014, Four new species of Cichlidogyrus (Monogenea, Ancyrocephalidae) from Sarotherodon mvogoi and Tylochromis sudanensis (Teleostei, Cichlidae) in Cameroon, Zootaxa 3881 (3), pp. 258-266 : 263

Cichlidogyrus djietoi n. sp.

( Fig. 5 )

Type host. Tylochromis sudanensis Daget.

Site. Gills.

Type locality. Cross River at Mamfé, Cameroon (05°45'58" N; 9°18'38" E).

Other locality. Munaya River (Cross River tributary) at Akwen Bridge, Cameroon (05°45'50" N; 9°03'39" E).

Specimens deposited. Holotype n° 37768 and 2 paratypes n° 37770 RMCA; 2 paratypes n° HEL 511 MNHN.

Etymology. The new species name is dedicated to Dr Djeto of the University of Yaoundé 1, Cameroon, for his technical advice during the manuscript elaboration.

Description (based on 10 individuals). Adults 556 (367–658, 9) long. 163 (92–212, 10) wide at level of ovary. Pharynx globular 45 (27–62, 10) in diameter. Long dorsal anchor with guard four times longer than shaft, both thickened, sometimes presence of fenestra, blade regularly curved and not hollow: a = 59 (54–63, 16), b = 41 (36–45, 16), c = 5 (3–11, 16), d = 20 (16–25, 16), e = 11 (9–12, 16). Slightly arched and thick dorsal transverse bar, short auricles: x = 49 (44–58, 9), w = 9 (8–11, 9), y = 18 (14–21, 9), h = 10 (7–13, 17). Ventral anchor not similar to dorsal one, with very short guard and shaft, sometimes presence of numerous fenestra: a = 45 (39–48, 18), b = 42 (38–46, 18), c = 4 (2–5, 18), d = 9 (7–13, 18), e = 12 (10–13, 18). V–shaped ventral transverse bar: x = 55 (49–59, 18), w = 8 (7–10, 9). First marginal hook of medium size, third to seventh marginal hook short: Mh I = 22 (17–25, 18), Mh II = 13 (12–14, 17), Mh III = 22 (19–26, 14), Mh IV = 25 (23–28, 16), Mh V = 24 (22–26, 17), Mh VI = 23 (21–26, 18), Mh VII = 22 (18–25, 18). Tubular, thin and slightly spirally coiled penis (2 turns) starting in a bulb with developed heel: Pe = 41 (39–48, 10), He = 7 (6–9, 10). Accessory piece is a large gutter shaped band, ending in a narrow extremity which is folded back. We did not see a filament linking the AP and the penis: AP = 51 (43–56, 10). Short, arched and funnel shaped vagina: x = 10 (7+13, 10), w = 2 (2–3, 10).

Remarks. This new species resembles its seven congeners already described from Tylochromis Regan 1920 host species (see above and C. chrysopiformis n. sp.) in having small auricles of the dorsal transverse bar (described as ‘two small, hollow outgrowths on the anterior convex face’ by Pariselle & Euzet 1994), a spirally coiled penis and an accessory piece apparently not connected to the base of the penis (except for C. sigmocirrus n. sp. and C. chrysopiformis n. sp.). Cichlidogyrus djietoi n. sp. resembles C. kothiasi , C. muzumanii and C. chrysopiformis n. sp. in having marginal hook pair I more developed (22 µm, 20.6 µm, 24 µm and 25 µm, respectively), while C. sigmocirrus n. sp., C. pouyaudi , C. berrebii and C. mulimbwai have Mh I of small size (14 µm, 12.3 µm, 13.1 µm and 15 µm, respectively). By the shape of the penis and that of the accessory piece C. djietoi n. sp. is easily distinguishable from C. mulimbwai : developed (7 µm) heel and thin short penis (41 µm), large AP (51 µm) vs. square heel (5 µm) and long and thick penis (63 µm), reduced (19 µm) AP, respectively. Cichlidogyrus djietoi n. sp. resembles C. kothiasi by the shape of the penis and that of the accessory piece; their main differences are the dimension of sclerotized pieces, always larger in C. djietoi n. sp.: e.g. penis 41 µm vs. 29 µm, AP 51 µm vs. 31 µm, dorsal anchor length 59 µm vs. 50 µm, etc.; and the presence of a sclerotized vagina in C. djietoi n. sp. (vs. absence). Cichlidogyrus djietoi n. sp. resembles C. chrysopiformis n. sp. by the shape of the penis (except for that of the heel: cylindrical vs. flared) and of the accessory piece (extremities are of different shape: folded back vs. ending in three protuberances). The main differences are the dimension of sclerotized pieces of the haptor, always larger in C. djietoi n. sp. [e.g. dorsal anchor length 59 µm vs. 50 µm, ventral anchor length 45 µm vs. 39 µm, dorsal bar length 49 µm vs. 41 µm, etc.], and the shape of the vagina (funnel shaped in C. djietoi n. sp. vs. cylindrical in C. chrysopiformis n. sp.).

Figures

FIGURE 5. Haptoral and genital hard parts of Cichlidogyrus djietoi n. sp.. Ap, accessory piece; DB, dorsal transverse bar; DA, dorsal anchor; He, heel; Pe, penis; VA, ventral anchor; VB, ventral transverse bar; Vg, vagina; I to VII, marginal hooks. Scale bar = 20 µm.