Dactylogyrus flagellatus, Guegan, Lambert & Euzet, 1989, Guegan, Lambert & Euzet, 1989

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 : 66

Dogielius flagellatus Guégan, Lambert & Euzet, 1989

( Figure 18 )

Type host and locality: Labeo coubie , Niger River (Bamako), Mali.

Other record: Labeo coubie, Baoulé River (Missira), Mali ( Guégan et al. 1989).

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

Site: Gill lamellae.

Type specimen: Holotype MNHN HC 272.

Material examined: 2 unflattened and 4 flattened specimens in GAP.

Description: Body length 326 (270–410; n = 2); greatest width 78 (69–86; n = 2) usually near midlength. Haptor 62 (53–71; n = 2) long, 129 (111–148; n = 2) wide. Single pair of anchors (ventral): inner length 40 (40–41; n = 3); outer length 42 (40–43; n = 3); point 32 (31–33; n = 3) long. One bar (ventral): 65 (64–67; n = 3) long, 7 (6–8; n = 3) wide. Hooks 7 pairs, slightly dissimilar in size; hook lengths (n = 2): pairs I, III, IV, V = 19–21; pair II = 18–19; pairs VI, VII = 22–23. Needles (1 pair) located near hooks of pair V. Vagina sclerotized, 139 (116–157; n = 4) long. Copulatory organ composed of a long slender tube and articulated accessory piece; total length 48 (47–49; n = 4); tube trace-length 156 (151–164; n = 4).

Remarks: The present specimens of D. flagellatus correspond in most morphological and metrical characters to those described originally (see Guégan et al. 1989). Only minor differences could be detected in the outer lengths of anchors, which were slightly longer in our specimens found on L. coubie from Senegal (40–43 vs. 34–38). However, we do not consider these differences to be significant because of the poorly defined nodal point for measuring the outer and inner anchor lengths on the outer surface of the concave part of the shaft (see Fig. 1 ).

Figures

FIGURE 1. Scheme of measurement for sclerotized structures of haptor and reproductive organs (modified according to Gussev (1985 )). (Aa) Anchor (Dactylogyrus), (Ab) anchor (Dogielius): 1 = inner length, 2 = outer length, 3 = inner root length, 4 = outer root length, 5 = point length; (B) bar: 6 = total length, 7 = median width; (C) hook: 8 = total length; (D) vagina: 9 = total length; (E) copulatory organ: 10 = total length, 11 = tube trace-length.

FIGURE 18. Dogielius flagellatus Guégan, Lambert & Euzet, 1989. A. anchor; B. ventral bar; C. hooks; D. needle; E. vagina; F. copulatory organ.