Biogeographical implications of Zambezian Cichlidogyrus species (Platyhelminthes: Monogenea: Ancyrocephalidae) parasitizing Congolian cichlids

摘要: Fishes normally restricted to inland waters are valuable model systems for historical biogeography, inter alia , because of their limited dispersal abilities and concordance with the distribution patterns other freshwater taxa (Zogaris et al . 2009). The comparison fish species assemblages has been major biogeographical tool delineating African aquatic ecoregions as fossil record is often meagre merely offers complementary information. This is, example, case Zambezian Congolian ichthyofaunal provinces, which display substantial contemporary diversity (Stewart 2001). Between both regions lies Bangweulu-Mweru ecoregion ( sensu Scott 2005), known its high percentage endemicity. Although hydrographically belonging Congo Basin, a affinity Zambezi province (Scott due river connections (Tweddle 2010). Studies comparing provinces rare hampered by lack data from Basin. latter harbours more than 1250 (Snoeks 2011) while in Zambezi, only 120 fishes found Indeed, richness declines all teleost families Basin southwards, riverine haplochromine cichlids forming notable exception this rule (Joyce 2005). it was hypothesized Tweddle (2010) that origin many haplochromines Serranochromis Regan Sargochromis Regan, Pharyngochromis Greenwood Chetia Trewavas, together serranochromines, have centre rivers Therefore, history Cichlidae across Zambezi- watershed not key cichlid biogeography on an scale, but also teleosts region. Yet, colonisation speciation difficult unravel complex hydrological (Katongo 2007; Schwarzer 2012).