Cichlidogyrus chrysopiformis, 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 : 262

Cichlidogyrus chrysopiformis n. sp.

( Fig. 4 )

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° 37776 and 5 paratypes n° 37778 RMCA; 5 paratypes n° HEL 513 MNHN.

Etymology. Refers to the shape of the male copulatory organs which resembles a Chrysopidae [e.g. Chrysoperla carnea (Stephens, 1836) ] the accessory piece being the wings and the penis the body.

Description (based on 20 individuals). Adults 478 (365–681, 20) long. 94 (65–131, 20) wide at level of ovary. Pharynx globular 30 (23–38, 20) in diameter. Dorsal anchor with guard three times longer than shaft, blade regularly curved and not hollow: a = 50 ± 3.1 (44–55, 40), b = 38 ± 2.4 (32–43, 40), c = 5 ± 1.5 (3–9, 40), d = 14 ± 2.1 (10–19, 40), e = 12 ± 1 (8–15, 40). Arched dorsal transverse bar, short auricles: x = 41 (37–45, 20), w = 8 (6–10, 20), y = 14 (9–17, 20), h = 10 ± 1.3 (8–13, 40). Ventral anchor not similar to dorsal one, with short guard: a = 39 ± 2.4 (35–43, 38), b = 37 ± 2.5 (33–43, 38), c = 4 ± 1 (2–7, 38), d = 8 ± 1.3 (6–11, 38), e = 13 ± 0.8 (11–15, 38). V–shaped ventral transverse bar: x = 44 ± 3.1 (38–51, 39), w = 6 (5–8, 20). First marginal hook of medium size, while third to seventh marginal hooks are short: Mh I = 25 ± 2.2 (22–31, 40), Mh II = 13 ± 0.7 (11–14, 31), Mh III = 20 ± 1 (18–22, 33), Mh IV = 22 ± 0.9 (19–25, 35), Mh V = 22 ± 0.9 (19–23, 38), Mh VI = 21 ± 1 (18–22, 39), Mh VII = 20 ± 1.1 (16–22, 38). Tubular and thin spirally coiled penis (1.5 turn) starting in a bulb with developed flared heel: Pe = 42 (36–46, 20), He = 9 (7–11, 20). Accessory piece is a large gutter shaped band, ending in a narrow complex extremity; this extremity shows three protuberances, one is a large hook, the two other are rounded. The AP seems to be linked to the basal bulb of the penis by a very thin filament, like in C. sigmocirrus n. sp.: AP = 56 (51–63, 20). Short, straight and slightly ringed vagina: x = 5 (4–6, 19), w = 2 (2–3, 19).

Remarks. This new species resembles its six congeners already described from species of Tylochromis Regan 1920 (see above and C. sigmocirrus 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) and a spirally coiled penis; the accessory piece seems to be linked to the basal bulb of the penis by a thin filament like in C. sigmocirrus n. sp.. Cichlidogyrus chrysopiformis n. sp. resembles C. kothiasi and C. muzumanii in having marginal hook pair I rather developed (25, 20.6 and 24 respectively) compared to C. sigmocirrus n. sp., C. pouyaudi , C. berrebii and C. mulimbwai , which have Mh I of small size (14, 12.3, 13.1 and 15 respectively). By the shape of the penis and that of the accessory piece C. chrysopiformis n. sp. is easily distinguishable from C. mulimbwai : developed (9 µm) flared heel and thin short penis (42 µm); large and long AP (56 µm) vs. square heel (5 µm) and long and thick penis (63 µm); reduced AP (19 µm), respectively. Cichlidogyrus chrysopiformis n. sp. resembles C. kothiasi by the shape of the penis and that of the accessory piece; the main differences are: the presence of a sclerotized vagina in C. chrysopiformis n. sp. (vs. absence) and the size of the penis and the accessory piece (42 µm and 56 µm vs. 29.4 µm and 30.8 µm, respectively).

Figures

FIGURE 4. Haptoral and genital hard parts of Cichlidogyrus chrysopiformis 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.