The African monogenean gyrodactylid genus Macrogyrodactylus Malmberg, 1957, and the reporting of three species of the genus on Clarias gariepinus in South Africa

Citation
Lf. Khalil et Sn. Mashego, The African monogenean gyrodactylid genus Macrogyrodactylus Malmberg, 1957, and the reporting of three species of the genus on Clarias gariepinus in South Africa, ONDERST J V, 65(4), 1998, pp. 223-231
Citations number
24
Categorie Soggetti
Veterinary Medicine/Animal Health
Journal title
ONDERSTEPOORT JOURNAL OF VETERINARY RESEARCH
ISSN journal
00302465 → ACNP
Volume
65
Issue
4
Year of publication
1998
Pages
223 - 231
Database
ISI
SICI code
0030-2465(199812)65:4<223:TAMGGM>2.0.ZU;2-8
Abstract
Three different species of the genus Macrogyrodactylus Malmberg, 1957, coll ected from the gills and skin of Clarias gariepinus (Burchell, 1822) from t he Middle Letaba Dam and Mokgoma-Matlala Dam in South Africa were examined and identified. This is the first record of a species of the genus in South Africa. The three species are M congolensis (Prudhoe, 1957)--found on the skin, M. clarii Gussev, 1961 and M. karibae Douellou & Chishawa, 1995-found on the gills. The last species is elevated to the status of a species havi ng been described previously as a subspecies of M.congolensis. The present study presents and discusses the! value of some of the taxonomi c characters which can be used to differentiate the species of the genus. T he shape and size of the sclerites of the haptor are found to be the most r eliable characters. Only four species of the genus, namely M. polypteri and the three above-named species are regarded to be valid. Three species, nam ely M. latesi Paperna, 1969, M. anabantii Paperna, 1973 and M. ctenopomii P aperna, 1973 are regarded as species inquirenda. Generic diagnoses, measure ments and illustrations of the sclerites of the four valid species are pres ented and a key for their differentiation is provided. The development of t he gyrodactylid population on C. gariepinus during the filling of the Middl e Letaba Dam in South Africa is discussed.