Dactylogyrus leonis, Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009

Musilová, Na Ď A, Ehulková, Eva Ř & Gelnar, Milan, 2009, Dactylogyrids (Platyhelminthes: Monogenea) from the gills of the African carp, Labeo coubie Rüppell (Cyprinidae), from Senegal, with descriptions of three new species of Dactylogyrus and the redescription of Dactylogyrus cyclocirrus Paperna, 1973, Zootaxa 2241, pp. 47-68 : 62

Dactylogyrus leonis n. sp.

( Figure 13 )

Type host and locality: Labeo coubie , Gambia River near the Campement du Lion (13º 01.493’N; 13º 14.491’W), Niokolo-Koba National Park, Senegal.

Other records: Labeo coubie, Mare de Simenti (13º 01.790’N; 13º 17.608’W), Gambia River near the hotel Simenti (sand beach 13° 01.543’N; 13º 17.471’W, gravel beach 13º 01.395’N; 13º 17.350’W), Niokolo- Koba National Park, Senegal.

Site: Gill lamellae.

Type specimens: Holotype MNHN HEL 96 (Th 195); 2 paratypes MNHN HEL 97 (Th 196), 98 (Th 197); 3 paratypes RMCA 37643, 37644, 37645.

Material examined: 7 unflattened and 10 flattened specimens in GAP.

Etymology: The species name refers to the type locality of the host.

Description: Body 365 (326–456; n = 6) long; greatest width 60 (48–75; n = 5) usually near midlength. Haptor 60 (53–68; n = 7) long, 102 (81–127; n = 7) wide. Single pair of anchors (dorsal): inner length 39 (36– 42; n = 10); outer length 28 (26–29; n = 10); inner root 17 (16–19; n = 10) long; outer root with subterminal notch on its inner side, 3 (3–4; n = 10) long; shaft with slightly swollen proximal part; point 12 (12–14; n = 10) long. Anchor filaments well-developed. Two bars: dorsal bar bone like, 22 (20–23; n = 10) long, 3 (3–4; n = 10) wide; ventral bar reduced in size, vestigial, slightly bent, 7 (6–8; n = 10) long, 2 (1–2; n = 10) wide. Hooks 7 pairs, similar in shape, slightly dissimilar in size; hook lengths (n = 10): pair I = 18 (16–21); pair II = 19 (17–22); pair III = 22 (19–23); pair IV = 21 (18–23); pair V = 18 (17–20); pair VI = 17 (16–19); pair VII = 17 (15–18). Needles (1 pair) located near hooks of pair V. Vagina slightly sclerotized, arrow like, 5 (5–6; n = 3) long. Copulatory organ composed of a curved tube and articulated accessory piece with 3 distal branches: 2 bilateral; 1 with foliaceous termination, originating subterminally from 1 of the 2 bilateral branches; total length 30 (28–32; n = 10); tube trace-length 32 (28–34; n = 10).

Remarks: Dactylogyrus leonis n. sp. resembles Dactylogyrus longiphallus Paperna, 1973 from Labeo victorianus and Dactylogyrus longiphalloides Guégan & Lambert, 1991 from L. alluaudi (see Paperna 1979; Guégan & Lambert 1991), by possessing similarly shaped haptoral sclerites and the same type of the copulatory organ. It differs from both species by the morphology of the vagina and by having anchors with conspicuous subterminal notch on the inner side of the outer root, a copulatory tube with lobated base (copulatory base simple in D. longiphallus and D. longiphalloides ), and an accessory piece with 3 distal branches (two distal branches connected by a fine sclerotized formation in D. longiphallus and D. longiphalloides ).

Figures

FIGURE 13. Dactylogyrus leonis n. sp. A. anchor; B. ventral bar; C. dorsal bar D. hooks (pairs I – V = ventral, pairs VI, VII = dorsal); E. needle; F. vagina; G. copulatory organ.