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)

Abstract

The first record of Gyrodactylus species Nordmann, 1832 on the cichlid fish from Senegal is reported. Gyrodactylus parasites were found on four host species studied, Hemichromis fasciatus, Hemichromis letournaeuxi, Oreochromis niloticus, and Sarotherodon galilaeus. Gyrodactylus cichlidarum Paperna (Bamidgeh 13:14-29, 1968) were collected from H. fasciatus, and its identity was confirmed based on the morphometrical comparison with the holotype specimens of G. cichlidarum. Only one specimen of Gyrodactylus sp. was noted on H. letournaeuxi. The gyrodactylid specimens on O. niloticus and S. galilaeus were described as Gyrodactylus ergensi n. sp. based on the detailed morphometrical analysis supported by sequencing. The haptoral sclerites of G. ergensi n. sp., which closely resemble those of Gyrodactylus nyanzae Paperna, 1973, are compared with the type material and discussed. A partial sequence of the internal transcribed spacer recombinant DNA (ITS rDNA) was obtained from two specimens of G. ergensi, and a close relationship between G. ergensi n. sp. and G. cichlidarum is suggested based on 92% similarity in ITS rDNA region.

Gyrodactylus malalai sp. nov. (Monogenea, Gyrodactylidae) from Nile tilapia, Oreochromis niloticus (L.) and Redbelly tilapia, Tilapia zillii (Gervais) (Teleostei, Cichlidae) in the Lake Turkana, Kenya

“…As our knowledge of monogenean biodiversity is a clear reflection of previous sampling effort, the predictions of parasite biodiversity in Asia and South America might also be high, following the conservative estimates of Bakke et al (2002). Based on the observations in Přikrylová et al (2009), this research found the hamuli of G. malalai sp. nov., having a slender appearance, morphologically very similar to those of G.nyanzae and G. ergensi.…”

“…All measurements are in micrometers unless stated otherwise and presented as mean with a standard deviation and range plus number of measurements in parentheses. For comparative studies of the African species of Gyrodactylus, type material of 14 species were obtained and studied, as mentioned in Přikrylová et al (2009).…”

“…The obtained nucleic acid sequences were subjected to Basic Local Alignment Search Tool searches (BLASTN searches) (Altschul et al 1990) to identify any matches or closely related Gyrodactylus species. Seven sequences of the African Gyrodactylus species were downloaded and aligned togethter with our sequences in Clustel W implement- Přikrylová, Matějusová, Musilová et Gelnar, 2009 Sarotherodon galilaeus (L.) Senegal G. haplochromi Paperna, 1973 Haplochromis angustifrons Boulenger Uganda G. hildae García-Vásquez, Hansen, Christison, Bron et Shinn, 2011 Oreochromis niloticus niloticus (L.) Ethiopia G. nyanzae Paperna, 1973 Oreochromis variabilis (Boulenger) Uganda G. sturmbaueri Vanhove, Snoeks, Volckaert et Huyse, 2011 Simochromis diagramma (Günther) Zambia G. thlapi Christison, Shinn et As, 2005 Pseudocrenilabrus philander philander (Weber) Botswana G. thysi Vanhove, Snoeks, Volckaert et Huyse, 2011 Simochromis diagramma (Günther) Zambia G. ulinganisus García-Vásquez, Hansen, Christison, Bron et Shinn, 2011 Oreochromis mossambicus (Peters) South Africa G. zimbae Vanhove, Snoeks, Volckaert et Huyse, 2011 Simochromis diagramma (Günther) Zambia…”

“…More recently, a number of Gyrodactylus spp. have been discovered not only on cichlids resulting in the description of 12 new species (Přikrylová et al 2009, Vanhove et al 2011, García-Vásquez et al 2011, Přikrylová et al 2012. The total number of Gyrodactylus species described from African fish is generally low (total 33), and only 10 of them parasitize cichlid fish (Table I).…”

A new species of Gyrodactylus (Monogenea, Gyrodactylidae), an ectoparasite from the endemic Iranocichla hormuzensis (Teleostei, Cichlidae), the only Iranian cichlid

“…To the best of our knowledge, it is the first parasite to be formally described from this fish species. It brings the total number of Gyrodactylus species described from cichlid hosts to 15 (Paperna 1979;Boeger & Popazoglo 1995;Christison et al 2005;Přikrylová et al 2009Přikrylová et al , 2012García-Vásquez et al 2011;Vanhove et al 2011). Jalali et al (2001) observed that the highly distinct zoogeographical regions of Iran and the high degree of endemicity of its freshwater fishes gave rise to a diverse monogenean fauna.…”