Seven new species of Dactylogyrus Diesing, 1850 (Dactylogyridae) are described from the gills of seven endemic species of cyprinoids (Cyprinidae, Leuciscidae) inhabiting the Balkan Peninsula: Dactylogyrus romuli n. sp. from Luciobarbus albanicus (Greece), Dactylogyrus remi n. sp. from Luciobarbus graecus (Greece), Dactylogyrus recisus n. sp. from Pachychilon macedonicum (Greece), Dactylogyrus octopus n. sp. from Tropidophoxinellus spartiaticus (Greece), Dactylogyrus vukicae n. sp. from Delminichthys adspersus (Bosnia and Herzegovina), Dactylogyrus leptus n. sp. from Chondrostoma knerii (Bosnia and Herzegovina), and Dactylogyrus sandai n. sp. from Telestes karsticus (Croatia). To delineate species boundaries, we used an integrative taxonomic approach combining morphological and genetic data. With these tools, we illustrate that some species of monogeneans considered as cryptic might be designated as pseudocryptic (morphologically similar, not easily differentiated) after a posteriori detailed morphological examination, as happened with D. romuli n. sp. and D. remi n. sp. Thus, for accurate species characterization, it is particularly important to acquire both morphological and molecular data from the same individual specimens, ideally along with illustrations of taxonomically important structures directly taken from hologenophores. Using phylogenetic reconstruction, we investigated the phylogenetic position of newly described Dactylogyrus species within Dactylogyrus species from Balkan cyprinoids with regard to morphological characteristics, host range, and geographical distribution.

TITLE: Découverte de la diversité des Monogènes (Plathelminthes) des poissons cypriniformes endémiques de la péninsule balkanique : nouvelles espèces de Dactylogyrus et commentaires sur leur phylogénie et les associations hôte-parasite dans un contexte biogéographique. ABSTRACT: Sept nouvelles espèces de Dactylogyrus Diesing, 1850 (Dactylogyridae) sont décrites à partir des branchies de sept espèces endémiques de cyprinoïdés (Cyprinidae, Leuciscidae) habitant la péninsule balkanique : Dactylogyrus romuli n. sp. de Luciobarbus albanicus (Grèce), Dactylogyrus remi n. sp. de Luciobarbus graecus (Grèce), Dactylogyrus recisus n. sp. de Pachychilon macedonicum (Grèce), Dactylogyrus octopus n. sp. de Tropidophoxinellus spartiaticus (Grèce), Dactylogyrus vukicae n. sp. de Delminichthys adspersus (Bosnie-Herzégovine), Dactylogyrus leptus n. sp. de Chondrostoma knerii (Bosnie-Herzégovine) et Dactylogyrus sandai n. sp. de Telestes karsticus (Croatie). Pour la délimitation des espèces, nous avons utilisé une approche taxonomique intégrative combinant des données morphologiques et génétiques. Avec ces outils, nous illustrons que certaines espèces de Monogènes considérées comme cryptiques pourraient être désignées comme pseudocryptiques (morphologiquement similaires, pas facilement différenciées) après un examen morphologique détaillé a posteriori, comme cela s’est produit avec D. romuli n. sp. et D. remi n. sp. Ainsi, pour une caractérisation précise des espèces, il est particulièrement important d’acquérir des données morphologiques et moléculaires à partir des mêmes spécimens individuels, idéalement avec des illustrations de structures taxonomiquement importantes directement prises à partir d’hologénophores. En utilisant la reconstruction phylogénétique, nous avons étudié la position phylogénétique des espèces de Dactylogyrus nouvellement décrites au sein des espèces de Dactylogyrus des cyprinoïdés des Balkans en ce qui concerne les caractéristiques morphologiques, la gamme d’hôtes et la distribution géographique.

Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

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