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A. Lambert - One of the best experts on this subject based on the ideXlab platform.

L.h.s. Lim - One of the best experts on this subject based on the ideXlab platform.

Antoine Pariselle - One of the best experts on this subject based on the ideXlab platform.

Tomáš Scholz - One of the best experts on this subject based on the ideXlab platform.

  • A new species of Ameloblastella Kritsky, Mendoza-Franco & Scholz, 2000 (Monogenoidea: Dactylogyridae) from South American freshwater catfishes (Siluriformes: Pimelodidae)
    Systematic Parasitology, 2020
    Co-Authors: Carlos A. Mendoza-palmero, María Alejandra Rossin, Manuel Marcial Irigoitia, Tomáš Scholz
    Abstract:

    Ameloblastella martinae n. sp. is described from the gills of the pimelodid catfishes (Siluriformes: Pimelodidae) Sorubim lima (Bloch & Schneider) (type-host) and Hemisorubim platyrhynchos (Valenciennes) in the Peruvian Amazonia, and on Pseudoplatystoma corruscans (Spix & Agassiz) and P. recticulatum Eigenmann & Eigenmann in Argentina. The new species is distinguished from other congeners mainly by the morphology of the male copulatory organ (MCO), which has a form of a corkscrew with tight rings, whereas in other species of Ameloblastella Kritsky, Mendoza-Franco & Scholz, 2000, the MCO is formed by a delicate and coiled tube forming loose rings. Sclerotised structures (haptoral elements and MCO) of specimens of A. martinae n. sp. were used to compare two parasite populations (from Peru and Argentina) using Euclidean distances. Despite the geographical isolation and different host-associations, both populations belong to the same species. The phylogenetic position of A. martinae n. sp. was analysed using partial sequences of the 28S rDNA gene along with 46 species of dactylogyrid parasites of siluriforms (Siluriformes) under Maximum Likelihood (ML) and Bayesian Inference (BI) criteria. Phylogenetic reconstructions showed that Ameloblastella represented by five species, including its type-species A. chavarriai (Price, 1936) from the heptapterid Rhamdia guatemalensis and A. martinae n. sp., was recovered as a well-supported monophyletic group (in both analyses, ML and BI). An additional species, Ameloblastella sp., was found on P. corruscans and P. reticulatum in Argentina. The morphology of the MCO and haptoral elements suggests that Ameloblastella sp. may represent a new species. However, the few specimens found and the lack of genetic sequences of this species precluded its formal description.

  • A new genus and two new species of dactylogyrid monogeneans from gills of Neotropical catfishes (Siluriformes: Doradidae and Loricariidae)
    Parasitology international, 2017
    Co-Authors: Aline Angelina Acosta, Tomáš Scholz, Isabel Blasco-costa, Philippe V. Alves, Reinaldo José Silva
    Abstract:

    A new genus of dactylogyrid monogeneans (Ancyrocephalinae), Paracosmetocleithrum n. gen., is erected to accommodate P. trachydorasi n. sp. from Trachydoras paraguayensis (Siluriformes: Doradidae) in the Upper Parana River basin, Brazil. The new genus differs from Neotropical dactylogyrids in the presence of a well-developed ornamentation in the middle portion of the ventral bar, and a sclerotized patch on the surface of the dorsal bar with an inconspicuous medial process that possesses two submedial projections arising from the tapered ends of this patch. In addition, Demidospermus rhinelepisi n. sp. is described from Rhinelepis aspera (Siluriformes: Loricariidae). The new species, which is the fifth species of the genus described from loricariids, can be differentiated from congeners by the possession of a sclerotized patch attached to the middle portion of the ventral bar, and by morphology of the accessory piece, which presents broad ends, tapering in the centre, rounded proximal end, distal end folding on both sides with folds extending to approximately ¾ of the accessory piece length. Molecular data on both new species are also provided and species composition of Demidospermus, recently revealed as polyphyletic by molecular studies including the present one, is discussed.

  • molecular phylogeny of neotropical monogeneans platyhelminthes monogenea from catfishes Siluriformes
    Parasites & Vectors, 2015
    Co-Authors: Carlos A Mendozapalmero, Isabel Blascocosta, Tomáš Scholz
    Abstract:

    The phylogenetic relationships of dactylogyrids (Monogenea: Dactylogyridae) parasitising catfishes (Siluriformes) from the Neotropical region were investigated for the first time. Partial sequences of the 28S rRNA gene of 40 specimens representing 25 dactylogyrid species were analysed together with sequences from GenBank using Bayesian inference, Maximum likelihood and Parsimony methods. Monophyly of dactylogyrids infecting catfishes and the Ancyrocephalinae was evaluated using the Approximately Unbiased test. The Ancyrocephalinae is a paraphyletic group of species clustering in three main clades as follows: (i) clade A comprising freshwater dactylogyrids from the Holarctic parasitising perciforms clustering together with species (Ameloblastella, Unibarra and Vancleaveus) parasitising Neotropical catfishes; (ii) clade B including species of Dactylogyrus (Dactylogyrinae) and Pseudodactylogyrus (Pseudodactylogyrinae) along with Ancyrocephalus mogurndae, and marine dactylogyrids with cosmopolitan distribution, parasites of scorpaeniforms and perciforms, along with the freshwater Cichlidogyrus and Scutogyrus (infecting African cichlids [Cichlidae]) and (iii) clade C containing exclusively dactylogyrids of siluriforms, freshwater and marine, with Palaearctic, Ethiopian, Oriental and Neotropical distributions; species of Aphanoblastella and Dactylogyridae gen. sp. 4 from the Neotropical region clustering together with species allocated in the Ancylodiscoidinae, along with species of Cosmetocleithrum, Demidospermus and Dactylogyridae gen. spp. The position of the Ancylodiscoidinae within a larger clade of dactylogyrids (ancyrocephalines) indicates that this subfamily does not represent a natural group. Instead, species allocated to this clade (dactylogyrids of siluriforms along with species of the Ancylodiscoidinae) should be considered as a separate subfamily within the Dactylogyridae. The erection of this taxon requires the search for morphological diagnostic characters in addition to phylogenetic information. A similar strategy should be considered for a new classification of the paraphyletic Ancyrocephalinae. Members of the three clades do not seem to share obvious morphological synapomorphies nor clear patterns in host-parasite associations, zoogeographical distribution or ecology. Clade A should be considered as the Ancyrocephalinae sensu stricto since it includes the type species Ancyrocephalus paradoxus Creplin, 1839. A new subfamily should be proposed to accommodate species currently allocated to Ancyrocephalinae clustering within clade B. Future attempts to propose a new classification of the subfamilies in the Dactylogyridae should include the phylogenetically diverse Neotropical dactylogyrids.

  • Molecular phylogeny of Neotropical monogeneans (Platyhelminthes: Monogenea) from catfishes (Siluriformes)
    Parasites & vectors, 2015
    Co-Authors: Carlos A. Mendoza-palmero, Isabel Blasco-costa, Tomáš Scholz
    Abstract:

    Background The phylogenetic relationships of dactylogyrids (Monogenea: Dactylogyridae) parasitising catfishes (Siluriformes) from the Neotropical region were investigated for the first time.

Zacharias G Scouras - One of the best experts on this subject based on the ideXlab platform.

  • A Time-Calibrated Mitogenome Phylogeny of Catfish (Teleostei: Siluriformes).
    PloS one, 2016
    Co-Authors: Ilias Kappas, S Vittas, Elena Drosopoulou, Chrysoula N. Pantzartzi, Zacharias G Scouras
    Abstract:

    A very significant part of the world’s freshwater ichthyofauna is represented by ancient, exceptionally diverse and cosmopolitan ray-finned teleosts of the order Siluriformes. Over the years, catfish have been established as an exemplary model for probing historical biogeography at various scales. Yet, several tantalizing gaps still exist in their phylogenetic history, timeline and mode of diversification. Here, we re-examine the phylogeny of catfish by assembling and analyzing almost all publicly available mitogenome data. We constructed an ingroup matrix of 62 full-length mitogenome sequences from 20 catfish families together with four cypriniform outgroups, spanning 15,557 positions in total. Partitioned maximum likelihood analyses and Bayesian relaxed clock dating using fossil age constraints provide some useful and novel insights into the evolutionary history of this group. Loricarioidei are recovered as the first siluriform group to diversify, rendering Neotropics the cradle of the order. The next deepest clade is the South American Diplomystoidei placed as a sister group to all the remaining Siluroidei. The two multifamilial clades of “Big Asia” and “Big Africa” are also recovered, albeit nodal support for the latter is poor. Within “Big Asia”, Bagridae are clearly polyphyletic. Other interfamilial relationships, including Clariidae + Heteropneustidae, Doradidae + Auchenipteridae and Ictaluridae + Cranoglanididae are robustly resolved. Our chronogram shows that siluriforms have a Pangaean origin, at least as far back as the Early Cretaceous. The inferred timeline of the basal splits corroborates the “Out-of-South America” hypothesis and accords well with the fossil record. The divergence of Siluroidei most likely postdated the final separation of Africa and South America. An appealing case of phylogenetic affinity elaborated by biogeographic dispersal is exemplified by the Early Paleogene split between the Southeast Asian Cranoglanididae and Ictaluridae, with the latter radiating into North America’s freshwater realm by Eocene. The end of Cretaceous probably concludes the major bout of diversification at the family level while with the dawn of the Cenozoic a prolific radiation is evident at the generic level.

  • the mitochondrial genome of the european catfish silurus glanis Siluriformes siluridae
    Journal of Biological Research, 2011
    Co-Authors: S Vittas, Elena Drosopoulou, Ilias Kappas, Chrysoula N. Pantzartzi, Zacharias G Scouras
    Abstract:

    The order Siluriformes, known as catfishes, constitutes an exceptionally diverse and speciose natural group of primarily freshwater ray-finned fishes (Nelson, 1994). Currently, 36 families and over 3000 species are recognized (Ferraris, 2007) rendering catfishes among the most diverse vertebrate orders (approximately 1 in 10 actinopterygians or 1 in 20 vertebrates is a catfish). Morphological (Fink & Fink, 1981) as well as molecular data (Saitoh et al., 2003; Sullivan et al., 2006) clearly support the monophyly of Siluriformes and place the main burst of their diversification at the late Cretaceous-early Tertiary boundary (Hardman, 2005). Despite the diversity of catfishes, interfamilial relationships still remain controversial and not fully resolved. Phylogenetic investigations have been stymied by the relative lack of dense sampling for certain mitochondrial and nuclear sequence data. For example, complete mitochondrial genomes have been determined for only six siluriform species, namely Pseudobagrus tokiensis (Saitoh et al., 2003), Corydoras rabauti (Saitoh et al., 2003), Ictalurus punctatus (Waldbieser et al., 2003), Cranoglanis bouderius (Peng et al., 2006), Pangasianodon gigas (Jondeung et al., 2007), and Liobagrus obesus (Kartavtsev et al., 2007). The European catfish Silurus glanis (Siluridae) is the second largest freshwater fish in Europe after the European sturgeon (Kottelat & Freyhof, 2007). Its natural distribution extends from the Aral Sea basin to the Danube and Vistula River basins, and southward to Greece and western Anatolia (Banarescu, 1989). The wels catfish (S. glanis) is of considerable commercial importance, particularly for central and eastern European countries, due to several characteristics that make it desirable for profitable aquaculture (Legendre et al., 1996; Proteau et al., 1996; Smitherman et al., 1996; Brzuska & Adamek, 1999). Few studies exist on the genetic variability and phylogeography of S. glanis populations (Krieg et al., 1999; Triantafyllidis et al., 1999a, b, 2002). Throughout the The mitochondrial genome of the European catfish Silurus glanis (Siluriformes, Siluridae)