Dactylogyrus retroversus Guégan, Lambert & Euzet, 1988

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 : 49-50

Dactylogyrus retroversus Guégan, Lambert & Euzet, 1988

( Figure 2 )

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

Other record: Labeo coubie, Baoulé River (Missira), Mali ( Guégan et al. 1988).

Present record: Labeo coubie, Mare de Simenti (13º 01.790’N; 13º 17.608’W), Niokolo-Koba National Park, Senegal.

Site: Gill lamellae.

Type specimen: Holotype MNHN HC 265.

Material examined: 2 flattened specimens in GAP.

Description: Dimensions of the body and haptor were not taken because of the poor quality of the only 2 found specimens. Single pair of anchors (dorsal): inner length 42 (n = 2); outer length 29 (n = 2); inner root 18–19 (n = 2) long; outer root 2–3 (n = 2) long; point 17–18 (n = 2) long. One bar (dorsal): 23–24 (n = 2) long, 3 (n = 2) wide. Hooks 7 pairs, similar in shape and size; hook lengths 15–16 (n = 2). Needles (1 pair) located near hooks of pair V. Vagina nonsclerotized. Copulatory organ composed of tube and articulated accessory piece, total length 30–34 (n = 2), tube trace-length 34–35 (n = 2).

Remarks: Dactylogyrus retroversus was adequately described by Guégan et al. (1988). This species closely resembles D. titus Guégan, Lambert & Euzet, 1988 as shown by similarities of the haptoral sclerites and the copulatory organ. However, D. retroversus differs from the latter species by the size of the anchor point (shorter with respect to the anchor size in D. titus ) and the size of the copulatory organ (smaller in D. titus ).

Figures

FIGURE 2. Dactylogyrus retroversus Guégan, Lambert & Euzet 1988. A. anchor; B. dorsal bar; C. hooks; D. needle; E. copulatory organ.