The Morphology And Host-specificity Of Dactylogyridae And Ancyrocephalidae Parasitizing 11 Species Of Host Fishes From Lancang River

Monogenean is one kind of typical ectoparasiteand preponderant flatwormgroup which was commonly discovered from the gills, shin and fins of host fishes.Monogenean leads to huge double damages to host fishes, and results in a very large number of deaths to cause great economic losses to fishery industry. For the globally prominent biodiversity and strict host-specificity, Monogenean provides an idealized experimental model for understanding co-evolution, co-speciation and zoogeography about host-parasite association between monogenean and host fishes.The prevalence ratio and host-specificity of monogenean belongs to Dactylogyridae and Ancyrocephalidae were investigated in the present study. The host fishes were collected from Jinghong basin of Lancang River, Xishuangbanna of Yunnan province. The taxa of Dactylogyridae and Ancyrocephalidae including new species, new records of distribution and host were discovered and identified based on morphological features and measurements through classic taxonomic methods. And the composition of host fishes was recorded here in as preliminary data sets to estimate the level of host-specificity of the parasites. The results in the present study enriched the fauna of China and provided the scientific date to clear the biodiversity and fauna of the Monogenean parasitizing fish.Of 558 fish hosts belong to for 8 families(Cyprinidae, Cobitidae, Gobiidae,Eleotridae, Channidae, Cichlidae, Belontiidae and Bagridae), 21 genera and 24 species were collected from land water or buying from the markets nearly Jinghong basin of Lancang River. Totally 15 species monogenean belongs to 2 family(Dactylogyridae and Ancyrocephalidae), 5 genera were discovered parasitizing 11 species fishes. Taxa including 2 recorded species, 6 new distribution record species, 1new distribution and new host record, 2 new species and 4 unrecorded species were described.Monogenea directory in this study as follows:1. 10 species of Order Dactylogyridae Bychowsky Family Dactylogyridae Bychowsky belong to 1 genus Dactylogyrus1 Dactylogyrus lancangjiangensis sp.nov.Host: Garra mirofrontis2 Dactylogyrus sp. 1Host: Mystacoleucus marginatus 3 Dactylogyrus sp. 2Host: Hemiculter leucisculus4 Dactylogyrus sp. 3Host: Rhodeus ocellatus5 Dactylogyrus sp. 4Host: Cyprinus carpio6 D. primaries Gussev, 1955Host: Opsariichthys bidens7 D. clavaeformis Gussev, 1955Host: Hemiculter leucisculus8 D. pseudogobii Achmerow, 1952Host: Abbottina rivularis9 D. squameus Gussev, 1955Host: Pseudorasbora parva10 D. extensus Mueller et Cleave, 1932Host: Cyprinus carpio2. 5 species of Order Dactylogyridae Bychowsky Ancyrocephalidae Bychowsky belong to 4 genera1 Cichlidogyrus bannaensis sp.nov.Host: Tilapia mossambica2 Cichlidogyrus halli Price & Kirk, 1967Host: Tilapia mossambica3 Parancyrocephallus rhinogobius Ling, 1973Host: Rhinogobius giurinus4 Scutogyrus longicornis Paperna & Thurston, 1969Host: Tilapia mossambica5 Bychowskyella pseudobagri Achmerow, 1952Host: Pelteobagrus fulvidracoAccording to the host composition of 15 species investigated monogenean, the results indicated different level of host-specificity. 9 species monogenean including D.lancangjiangensis sp.nov., C. bannaensis sp.nov., D. squameus Gussev, 1955 and etc.presented very strict host-specificity at the level of the species of the host fishes. And D. clavaeformis Gussev, 1955 and D. extensus Mueller et Cleave, 1932 presented strongly host-specificity at the level of the genus of the host fishes. There were 4 species(including D. primaries Gussev, 1955, D. pseudogobii Achmerow, 1952, S.longicornis Paperna & Thurston, 1969 and C. halli Price & Kirk,1967) presented host-specificity at the level of the family in present study.