Host-specific parasites exhibit close co-evolutionary associations with their hosts. In the case of fragmented/disjunct host distribution, host-specific may reflect biogeographical history regions and/or role played by contacts The present study was focused on Dactylogyrus (Monogenea) species almost exclusively parasitizing cyprinoid fishes. We investigated phylogenetic relationships between Nearctic cyprinoids (Leuciscidae) and Palearctic used phylogeny to explore biogeography fish hosts in...

Beyond morphology: cryptic diversity in nine new Gyrodactylus species (Monogenea: Gyrodactylidae) associated with northwest African barbels (Cyprinidae) and remarks on nyingiae Shigoley, Rahmouni, Louizi, Pariselle Vanhove, 2023

Abstract Diplozoids are parasitic flatworms known for their unique development, whereby two hermaphroditic individuals fuse to form a single adult. They exhibit varying host specificity, with Paradiplozoon homoion having the widest distribution, making it suitable model population genetic studies. In this study, variability of P. was assessed from 60 cyprinoid fish species at 47 sites in western Palaearctic using mitochondrial COI gene. Moreover, novel sequence data four ribosomal and one...

Abstract Aim To analyse patterns of nuclear and mitochondrial genetic variation in the European chub, Squalius cephalus (Linnaeus, 1758), order to understand evolutionary history this species test biogeographical hypotheses for existence co‐distributed freshwater fish species. Location Rivers Europe (Finland, Poland, Czech Republic, France, Bulgaria, Spain, Italy). Methods We genotyped 12 polymorphic microsatellite markers derived from 310 individuals collected across distribution S....

Abstract Dermoergasilus madagascarensis n. sp. is described from the gills of Paretroplus polyactis , an endemic cichlid fish in Madagascar, using a combined morphological (light microscopy and SEM) molecular approach (partial 18S rDNA, 28S COI sequences). The new species characterized mainly by possessing: (i) roughly pentagonal cephalosome; (ii) antennal endopodal segments covered with slightly inflated membrane; (iii) maxillule bearing 2 equally long outer setae minute inner seta; (iv)...

SUMMARY The diversity and similarity of parasite communities is a result many determinants widely considered in ecology. In this study, the metazoan 15 chub populations ( Leuciscus cephalus ) were sampled across wide geographical range. Three hypotheses biogeographical gradients species tested: (1) latitudinal gradient, (2) ‘favourable centre’ versus ‘local oasis’ model, (3) decay with distance. We found that localities marginal zones distribution showed lower richness diversity. A...

Abstract Ergasilus (von Nordmann, 1832) (Ergasilidae) is a species-rich group of parasitic copepods with wide distribution in freshwater, marine and brackish environments. Up to now, 9 species are known from cichlid fishes Africa. In this study, 5 species, including 3 new, were collected the gills 12 (11 genera: Bathybates , Ctenochromis Eretmodus Gnathochromis Lamprologus Neolamprologus Ophthalmotilapia Perissodus Simochromis Spathodus Tanganicodus ) northeastern shore Lake Tanganyika...

Monogenean parasites are often co-introduced with their fish hosts into novel areas. This study confirmed co-introduction of two dactylogyrids, Dactylogyrus squameus Gusev, 1955 and Bivaginogyrus obscurus (Gusev, 1955), a newly described gyrodactylid species, Gyrodactylus pseudorasborae n. sp. Europe along host, the invasive topmouth gudgeon Pseudorasbora parva (Temminck & Schlegel) from East Asia. All three species were observed in lower Dnieper middle Danube basin regions had slightly...

Despite the high diversity of freshwater fishes in Nearctic region, little is known about composition their parasite communities. We addressed viviparous monogeneans Gyrodactylus parasitizing highly diversified cypriniform fish inhabiting watersheds. Nowadays, a thorough assessment spp. requires both morphological traits and genetic data. A combination taxonomically important haptoral features sequences ITS regions 18S rDNA revealed 25 two catostomid 15 leuciscid species sampled six distinct...

African catfishes of the families Bagridae and Clariidae are known to be parasitized with monogeneans Quadriacanthus Paperna, 1961 (Dactylogyridae). The genus remains taxonomically challenging due its speciose nature relatively wide host range representing two fish orders, i.e. Siluriformes Osteoglossiformes, in Africa Asia. Here, we investigated diversity spp. parasitizing Clarias gariepinus (Burchell), Heterobranchus bidorsalis Geoffroy Saint-Hilaire, Bagrus docmak (Forsskål) collected...

Gibel carp (Carassius gibelio) is a cyprinid fish that originated in eastern Eurasia and considered as invasive European freshwater ecosystems. The populations of gibel Europe are mostly composed asexually reproducing triploid females (i.e., by gynogenesis) sexually diploid males. Although some cases coexisting sexual asexual reproductive forms known vertebrates, the molecular mechanisms maintaining such coexistence still question. Both reproduction modes supposed to exhibit evolutionary...

ascaridoid nematodes referable to Brevimulticaecum heterotis (Petter, Vassiliadès et Marchand, 1979) Khalil, 1984 were recorded from the intestine of african bonytongue, Heterotis niloticus (cuvier) (arapaimidae, osteoglossiformes), Mare simenti in Niokolo Koba National Park, East senegal and Kosti, sudan.their examination using light microscopy for first time both environmental scanning electron revealed some previously unreported morphological features made possible a detailed...

Knowledge on the diversity of parasitic flatworms Western Mediterranean cyprinids is extremely scarce. In present study, we parasitologically investigated 12 cyprinid species across Strait Gibraltar inhabiting watersheds in northwest Africa (Morocco) and Iberia (Portugal Spain). Taxonomically relevant features attachment organ sequences 18S rDNA ITS regions were used for delineation to investigate their phylogenetic relatedness. Among Gyrodactylus collected from Morocco Spain, identified...

Abstract Gyrodactylid parasites were observed on non-native populations of North-American freshwater catfishes, Ameiurus nebulosus and melas (Siluriformes: Ictaluridae), at several sites in the Elbe River basin, Czech Republic, Europe. Using a combination morphological genetic analyses, infecting A. determined to be Gyrodactylus , North American parasite co-introduced Europe along with its fish hosts. Subtle morphometrical differences, as well seasonal variations, among collected from . The...

African tetras (Alestidae) belonging to Brycinus Valenciennes are known be parasitized with monogeneans attributed two genera, Annulotrema Paperna & Thurston, 1969 and Characidotrema 1968 (Dactylogyridae). During a survey of parasitizing alestids, species were collected in Cameroon, D. R. Congo, Senegal, South Africa, Sudan Zimbabwe. This paper provides new morphological data the first molecular analysis broadening our knowledge on diversity these parasites. Seven (four three new) reported...

Introduction Parasite-mediated selection is considered one of the potential mechanisms contributing to coexistence asexual-sexual complexes. Gibel carp ( Carassius gibelio ), an invasive fish species in Europe, often forms populations composed gynogenetic and sexual specimens. Methods The experimental infection was induced gibel using eye-fluke Diplostomum pseudospathaceum (Trematoda), transcriptome profile spleen as a major immune organ analyzed reveal differentially expressed...

Abstract The round goby, Neogobius melanostomus , is a Ponto-Caspian fish species currently found in many parts of Europe, including the North Sea riverine deltas. objective this study was to examine parasite community caught lower Elbe (Süderelbe – tidal zone; Geesthacht non-tidal) Germany and compare it with published data from upper (Ústí nad Labem) Czech Republic. Twelve taxa were recorded Elbe, six Süderelbe nine near city Geesthacht. mainly infected Angullicola crassus larvae, while...