Monogènes parasites de Clariidae (Teleostei, Siluriformes) au Cameroun : I. Description de deux nouvelles espèces du genreGyrodactylusdans le bassin du Nyong

Abstract

MONOGENEAN PARASITES FROM CLARIIDAE (TELEOSTEI, SILURIFORMES) IN CAMEROON: I. DESCRIPTION OF TWO NEW SPECIES OF GYRODACTYLUS FROM THE NYONG BASSIN The study of gill and skin parasites of three fishes species belonging to the genus Clarias: C. camerunensis, C. jaensis and C. pachynema, from the Nyong basin (Cameroon), revealed the presence of two new Monogenean species of the genus Gyrodactylus Nordmann: G. camerunensis n. sp. and G. nyongensis n. sp. parasite of Clarias camerunensis, C. jaensis and C. pachynema. Gyrodactylus camerunensis n. sp. is clearly distinguished from G. nyongensis n. sp. by the smaller size of the haptor sclerites. These two new species differ also from their closest african relatives of the genus Gyrodactylus , G. rysavyi, G. clarii and G. alberti, by the morpholohy and size of the haptorail sclerites. Their host specificity was discussed and appeared stenoxenous (mesostenoxenous).

An overview of the Gyrodactylus (Monogenea: Gyrodactylidae) species parasitizing African catfishes, and their morphological and molecular diversity

“…Moreover, the hamuli of G. gelnari n. sp. (mean total length 71.4 μm) are larger than those of G. camerunensis (mean 54 μm, Nack et al 2005). Based on the dimensions of the haptoral sclerites, G. gelnari n. sp.…”

“…Only 28 Gyrodactylus species have been described from African fishes, of which only seven are known from catfishes (Christison et al 2005;Nack et al 2005;Přikrylová et al 2009a;Vaughan et al 2010;Vanhove et al 2011a;García-Vásquez et al 2011). This is a limited number compared to the more than 400 valid Gyrodactylus spp.…”

“…Two of them, Gyrodactylus alberti Paperna, 1973 and Gyrodactylus clarii Paperna, 1973 where described from Uganda (Paperna 1973); another two, Gyrodactylus rysavyi Ergens, 1973 andGyrodactylus groschafti Ergens, 1973 were contemporaneously described from Egypt (Ergens 1973); and finally, South Africa saw the description of Gyrodactylus transvaalensis Prudhoe and Hussey, 1977. Another clariid host, Gyrodactylus camerunensis Lönnberg, 1895 yielded two new gyrodactylid species in Cameroun: G. camerunensis Nack, Bilong Bilong and Euzet, 2005 and Gyrodactylus nyongensis Nack, Bilong Bilong and Euzet, 2005. Clarias jaensis Boulenger, 1909 andClarias pachynema Boulenger, 1903 were mentioned as additional host fishes for these two Gyrodactylus species.…”

Gyrodactylus species (Monogenea: Gyrodactylidae) on the cichlid fishes of Senegal, with the description of Gyrodactylus ergensi n. sp. from Mango tilapia, Sarotherodon galilaeus L. (Teleostei: Cichilidae)

“…For a comparative study of the African species of Gyrodactylus, the type material from the Musée Royal del'Afrique Centrale, Tervuren, Belgium was obtained (see Christison et al (2005)). Additional material was obtained from the Muséum National d'Histoire Naturelle, Paris, France (Gyrodactylus camerunensis (Nack et al 2005) paratypes number 263 and 264 HG, Ti 148-148 bis and Gyrodactylus nyongensis (Nack et al 2005) Collected Gyrodactylus specimens were removed from ethanol, and genomic DNA was extracted according to the method described in Matějusová et al (2001). Polymerase chain reaction was carried out according to methods in Přikrylová et al (2009).…”

“…The incomplete original description was recently revised based on the G. cichlidarum specimens obtained from fry of the Nile tilapia, Oreochromis niloticus L., cultured in an isolated aquarium system at the University of Stirling, United Kingdom (García-Vásquez et al 2007). Total number of Gyrodactylus species found on African freshwater fishes is 20, and only four of them, including G. cichlidarum, were described from cichlids (Christison et al 2005;Nack et al 2005). Three other gyrodactylids species are as follows: Gyrodactylus haplochromi Paperna 1973, Gyrodactylus nyanzae Paperna 1973, and Gyrodactylus thlapi (Christison et al 2005).…”