Scutogyrus vanhovei, Pariselle, Antoine, Bitja Nyom, Arnold R. & Bilong Bilong, Charles F., 2013

Pariselle, Antoine, Bitja Nyom, Arnold R. & Bilong Bilong, Charles F., 2013, Checklist of the ancyrocephalids (Monogenea) parasitizing Tilapia species in Cameroon, with the description of three new species, Zootaxa 3599 (1) : -

Scutogyrus vanhovei n. sp.

( Fig. 5 )

Type host: Tilapia mariae Boulenger.

Site: Gills.

Type locality: Lake Ossa, Cameroon (3°47’24”N; 10°01’22” E).

Specimens deposited: Holotype MNHN n° HEL 278. Paratypes MNHN (3) n° HEL 279 [on the same slide there are 2 voucher specimens of Cichlidogyrus testificatus Dossou, 1982 ]; NHMUK (3) n° 2012.8.30.4 [note that on the same slide there are voucher specimens of Cichlidogyrus digitatus Dossou, 1982 (1) n° 2012.8.30.7 and Cichlidogyrus slembroucki Pariselle & Euzet, 1998 (1) n° 2012.8.30.8]; RMCA (1) n° 37707 [note that on the same slide there are voucher specimens of Cichlidogyrus digitatus Dossou, 1982 (1) n° 37708, Cichlidogyrus ouedraogoi Pariselle & Euzet, 1996 (1) n° 37709 and Cichlidogyrus slembroucki Pariselle & Euzet, 1998 (1) n° 37710].

Etymology: Named after Maarten M. P. Vanhove, a PhD student working on monogenean species of cichlid fishes from Lake Tanganyika.

Description (based on 16 individuals): adults 480 (378–591) (16) long. 89 (70–109) (16) large at level of penis. Large and globular pharynx: 52 (41–64) (16) in diameter. Dorsal anchor with guard longer than shaft, and regularly curved blade: a = 31 (29–35) (25), b = 24 (20–27) (25), c = 8 (6–10) (24), d = 11 (8–14) (25), e = 9 (7–11) (25). Dorsal transverse bar typical of Scutogyrus with long auricle and lateral expansions: x = 46 (42–49) (16), z = 26 (22–31) (16), w = 4 (4–6) (16), y = 14 (11–16) (16), h = 31 (25–35) (16). Ventral anchor with guard two times longer than shaft, blade regularly arched: a = 31 (29–32) (27), b = 28 (26–30) (27), c = 5 (3–7) (27), d = 10 (8–12) (27), e = 11 (9–14) (27). V–shaped ventral transverse bar typical of Scutogyrus (supporting a large plate), branches straight: x = 39 ± 1.4 (36–41) (30), w = 30 (23–37) (16). First uncinuli of small size, third to seventh long: U I = 16 (15–18) (16), U II = 12 (10–13) (9), U III = 28 (24–30) (11), U IV = 31 (27–33) (14), U V = 32 (27–36) (16), U VI = 27 (25–32) (11), U VII = 27 (26–28) (13). MCC made up of a straight penis showing a distinct swollen portion (Sp) at first third, a marked heel, and a simple and straight accessory piece ending in a large and strong hook: Pe = 48 (41–64) (16), Sp = 13 (12–15) (16), He = 3 (3–4) (16), AP = 39 (35–46) (16). No sclerotised vagina.

Remarks: S. vanhovei n. sp. resembles all the species of the genus by the morphology of its haptoral sclerotised pieces and that of the accessory piece of the penis. It can be distinguished by the presence of a distinct swollen portion of the penis.

Figures

FIGURE 5. Hard parts of Scutogyrus vanhovei n. sp. Ap, accessory piece; He, heel; Pe, penis. DA, dorsal anchor. DB, dorsal transverse bar. VA, ventral anchor. VB, ventral transverse bar. I – VII, uncinuli (scale bar = 30 µm).