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Gergana P Vasileva - One of the best experts on this subject based on the ideXlab platform.
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Taxonomic revision of Joyeuxilepis Spassky, 1947 (Cestoda: Amabiliidae): redescriptions of J. biuncinata (Joyeux & Baer, 1943), J. decacantha (Fuhrmann, 1913) and J. pilatus Borgarenko & Gulyaev, 1991
Systematic Parasitology, 2003Co-Authors: Gergana P Vasileva, David I. Gibson, Rodney A. BrayAbstract:Two species of Joyeuxilepis Spassky, 1947 are redescribed from Tachybaptus ruficollis in Bulgaria: J. biuncinata (Joyeux & Baer, 1943) and J. pilatus Borgarenko & Gulyaev, 1991. The syntypes of J. decacantha (Fuhrmann, 1913) from Podiceps cristatus in Sweden and voucher specimens of J. pilatus (identified as ‘ Tatria decacantha ’) from T. ruficollis in England (new geographical record) from the British Museum (Natural History) Collection are also re-described. The voucher specimens and cysticercoids of Tatria spp. from dragonfly nymphs in Wales recorded by Rees (1973) were re-examined. Previous records of J. biuncinata , J. decacantha and J. pilatus are critically analysed in view of the present results. The major reliable diagnostic characters for species of Joyeuxilepis are presented and the distinguishing criteria for the three species studied are re-evaluated.
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Taxonomic revision of Tatria Kowalewski, 1904 (Cestoda: Amabiliidae): redescriptions of T. appendiculata Fuhrmann, 1908 and T. duodecacantha Olsen, 1939, a key and an amended diagnosis of Tatria (sensu stricto)
Systematic Parasitology, 2003Co-Authors: Gergana P Vasileva, David I. Gibson, Rodney A. BrayAbstract:Tatria appendiculata Fuhrmann, 1908 is redescribed on the basis of syntypes from Tachybaptus dominicus in Brazil and voucher specimens from the same host species in Cuba previously recorded by Rysavy & Macko (1971). Paratypes of T. duodecacantha Olsen, 1939 from Podilymbus Podiceps in the USA are also redescribed and, in contrast with the opinion of Ryzhikov & Tolkacheva (1981), the species is recognised as valid. The major reliable diagnostic characters of Tatria and the distinguishing criteria applicable at the species level are re-evaluated. An amended generic diagnosis of Tatria ( sensu stricto ) and an identification key to its constituent species are presented.
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Taxonomic revision of Tatria Kowalewski, 1904 (Cestoda: Amabiliidae): redescriptions of T. biremis Kowalewski, 1904 and T. minor Kowalewski, 1904, and the description of T. gulyaevi n. sp. from Palaearctic grebes
Systematic Parasitology, 2003Co-Authors: Gergana P Vasileva, David I. Gibson, Rodney A. BrayAbstract:Two species of Tatria Kowalewski, 1904 are redescribed from grebes in Bulgaria: T. biremis Kowalewski, 1904 (specimens from Podiceps nigricollis ) and T. minor Kowalewski, 1904 (specimens from P. cristatus and P. nigricollis ). T. mircia Gulyaev, 1990 is synonymised with T. minor . The previous records of T. biremis , T. minor and T. mircia are critically analysed in view of the present results. T. gulyaevi n. sp. is described from P. nigricollis from Bulgaria and the Czech Republic and from an unidentified grebe species from Turkey. Some of the previous records of T. minor and T. biremis are recognised as belonging to T. gulyaevi . One specimen illustrated by Kowalewski (1904) is designated as a lectotype of T. minor in order to stabilise the nomenclatural standing of this species.
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Palaearctic species of the genus Confluaria Ablasov (Cestoda, Hymenolepididae): redescriptions of C. podicipina (Szymanski, 1905) and C. furcifera (Krabbe, 1869), description of C. pseudofurcifera n. sp., a key and final comments
Systematic Parasitology, 2000Co-Authors: Gergana P Vasileva, Boyko B Georgiev, Todor GenovAbstract:Redescriptions are provided of Confluaria podicipina (Szymanski, 1905) (specimens from Podiceps nigricollis and Tachybaptus ruficollis from Bulgaria) and C. furcifera (Krabbe, 1869) (syntypes from P. grisegena from Denmark and specimens from P. grisegena , P. nigricollis and T. ruficollis from Bulgaria). C. pseudofurcifera n. sp. is described from P. cristatus from Switzerland and Bulgaria. The previous records of C. furcifera from P. cristatus in Switzerland (Joyeux & Baer, 1950), Poland (Jarecka, 1958; Korpaczewska, 1960), Czech Republic (Rysavy & Sitko, 1995) and Baltic Coast (Galkin, 1986) are recognised as belonging to C. pseudofurcifera . Confluaria Ablasov in Spasskaya, 1966 is recognised as a valid genus and Dimorphocanthus Maksimova, 1989 is confirmed as its synonym. A key to the Palaearctic species of Confluaria is presented.
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palaearctic species of the genus confluaria ablasov cestoda hymenolepididae redescriptions of c podicipina szymanski 1905 and c furcifera krabbe 1869 description of c pseudofurcifera n sp a key and final comments
Systematic Parasitology, 2000Co-Authors: Gergana P Vasileva, Boyko B Georgiev, T GenovAbstract:Redescriptions are provided of Confluaria podicipina (Szymanski, 1905) (specimens from Podiceps nigricollis and Tachybaptus ruficollis from Bulgaria) and C. furcifera (Krabbe, 1869) (syntypes from P. grisegena from Denmark and specimens from P. grisegena, P. nigricollis and T. ruficollis from Bulgaria). C. pseudofurcifera n. sp. is described from P. cristatus from Switzerland and Bulgaria. The previous records of C. furcifera from P. cristatus in Switzerland (Joyeux & Baer, 1950), Poland (Jarecka, 1958; Korpaczewska, 1960), Czech Republic (Rysavy & Sitko, 1995) and Baltic Coast (Galkin, 1986) are recognised as belonging to C. pseudofurcifera. Confluaria Ablasov in Spasskaya, 1966 is recognised as a valid genus and Dimorphocanthus Maksimova, 1989 is confirmed as its synonym. A key to the Palaearctic species of Confluaria is presented.
Michel D. Houseman - One of the best experts on this subject based on the ideXlab platform.
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Fossil grebes from the Truckee Formation (Miocene) of Nevada and a new phylogenetic analysis of Podicipediformes (Aves)
Palaeontology, 2013Co-Authors: Daniel T. Ksepka, Amy M. Balanoff, Michael A. Bell, Michel D. HousemanAbstract:Podicipediformes is a cosmopolitan clade of foot-propelled diving birds that, despite inhabiting marine and lacustrine environments, have a poor fossil record. In this contribution, we describe three new grebe fossils from the diatomite beds of the Late Miocene Truckee Formation (10.2 ± 0.2 Ma) of Nevada (USA). Two postcranial skeletons and an associated set of wing elements indicate that at least two distinct grebe species occupied the large, shallow Lake Truckee during the Miocene. Phylogenetic analysis of morphological data supports a basal divergence between a clade uniting the dabchicks (Tachybaptus, Limnodytes, Poliocephalus) and a clade uniting Podilymbus, Rollandia, Podiceps and Aechmophorus. Missing data, combined with a paucity of informative skeletal characters, make it difficult to place the Truckee grebes within either of these major clades. Given the weak projection of the cnemial crests compared with extant grebes, it also remains plausible that these specimens represent stem lineage grebes. Although more material is needed to resolve the phylogenetic position of the Truckee grebes, our analysis offers insight into the tempo of grebe evolution by placing the Miocene taxon Thiornis sociata within the dabchick clade. Thiornis sociata provides a minimum age calibration of 8.7 Ma for the basal divergence among dabchicks. Based on the recovery of a nonmonophyletic Tachybaptus and placement of the Western Hemisphere ‘Tachybaptus’ dominicus as the basal member of the otherwise exclusively Eastern Hemisphere dabchick clade, we resurrect the genus Limnodytes for this extant species (Limnodytes dominicus). Our results also nest the large, long-necked Aechmophorus grebes within the genus Podiceps, as the sister taxon to Podiceps major.
Tombari, Andrea D. - One of the best experts on this subject based on the ideXlab platform.
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Diversidad de vertebrados acuáticos de tres humedales urbanos de la ciudad de Buenos Aires
Instituto de Limnología "Raúl A. Ringuelet" Facultad de Ciencias Naturales y Museo (UNLP), 2019Co-Authors: Llamazares Vegh Sabina, Villatarco Vázquez Paola, Kunert, María Cecilia, Tombari, Andrea D.Abstract:The urban wetlands are sites of high biodiversity that are under a great anthropogenic pressure. In the city of Buenos Aires, one of the more important areas of recreation is constituted by Parque Tres de Febrero (well-known as like “Bosques de Palermo”), that conforms a green zone of 25 ha. In this area there are artificial wetlands of diverse physical characteristics. In the present work, the goal is to determine vertebrate’s diversity in these urban aquatic enviroments in order to evaluate the degree of impact of the recreational activity on the conservation of the vertebrates associated to the water bodies. The study was carried out in three artificial lagoons included in the park: Regatas, Rosedal and Planetario. Altogether, seventeen species of fish (Prochilodus lineatus, Oligosarcus jenynsii, Cheirodon interruptus, Bryconamericus iheringii, Hoplias malabaricus, Hypostomus commersoni, Rhamdia quelen, Pimelodus albicans, Pimelodus maculatus, Cyprinus carpio, Cnesterodon decemmaculatus, Gambusia affinis, Jenynsia multidentata, Synbranchus marmoratus, Australoheros facetus, Gymnogeophagus meridionalis and Crenicichla scottii), eighteen species of birds (Podiceps rolland, Podilymbus Podiceps, Podiceps major, Phalacrocorax olivaceus, Ardea alba, Egretta thula, Butorides striatus, Nycticorax nycticorax, Anas georgica, Anas platyrhynchos, Anas platyrhynchos domesticus, Anser anser, Cairina moschata, Netta peposaca, Aramus guarauna, Fulica armillata, Fulica leucoptera and Chloroceyle amazona), three species of turtles (Phrynops hilarii, Trachemys scripta elegans and Trachemys venusta) and one species of mammal were registered (Myocastor coipo). Among these species, eight are introduced: two fishes (Cyprinus carpio and Gambusia affinis), two turtles (Trachemys scripta elegans and Trachemys venusta) and four birds (Anas platyrhynchos, Anas platyrhynchos domesticus, Anser anser and Cairina moschata). Regatas was the site with greater diversity of fishes (n=17) that represents a 10.43% of Río de la Plata’s ichthyofauna (n=163). This site lodges a 13% of the bird species associated to registered water bodies in the City of Buenos Aires (n=107). When comparing the specific richness among lagoons, we found high similarity between Regatas and Planetarium. Also, both sites presented the greatest specific richness of fish during the months of January and February. From this preliminary study it was possible to describe and to differentiate each lagoon by its fauna and physical characteristics, and also it constitutes the base to continue with further studies of communities which allow the development of the necessary guidelines of handling for the protection of Lagos Tres de Febrero.Los humedales urbanos son sitios de alta biodiversidad que se encuentran bajo una gran presión antropogénica. En la ciudad de Buenos Aires, una de las áreas de recreación más importantes está constituida por el Parque Tres de Febrero (conocido como "Bosques de Palermo"), que conforma una zona verde de 25 hectáreas. En esta zona existen humedales artificiales de diversas características físicas. En el presente trabajo, el objetivo es determinar la diversidad de los vertebrados en estos entornos acuáticos urbanos para evaluar el grado de impacto de la actividad recreativa en la conservación de los vertebrados asociados a los cuerpos de agua. El estudio se realizó en tres lagunas artificiales incluidas en el parque: Regatas, Rosedal y Planetario. En total, diecisiete especies de peces (Prochilodus lineatus, Oligosarcus jenynsii, Cheirodon interruptus, Bryconamericus iheringii, Hoplias malabaricus, Hypostomus commersoni, Rhamdia quelen, Pimelodus albicans, Pimelodus maculatus, Cyprinus carpio, Cnesterodon decemmaculatus, Gambusia affinis, Jenynsia multidentata, Synbranchus marmoratus, Australoheros facetus, Gymnogeophagus meridionalis and Crenicichla scottii), dieciocho especies de aves (Podiceps rolland, Podilymbus Podiceps, Podiceps major, Phalacrocorax olivacius, Ardea alba, Egretta thula, Butorides striatus, Nycticorax nycticorax, Anas georgica, Anas platyrhynchos, Anas platyrhynchos domesticus, Anser anser, Cairina moschata, Netta peposaca, Aramus guarauna, Fulica armillata, Fulica leucoptera and Chloroceyle amazona), tres especies de tortugas (Phrynops hilarii, Trachemys scripta elegans y Trachemys venusta) y una especie de mamífero (Myocastor coipo). Entre estas especies, se presentan ocho introducidas: dos peces (Cyprinus carpio y Gambusia affinis), dos tortugas (Trachemys scripta elegans y Trachemys venusta) y cuatro aves (Anas platyrhynchos, Anas platyrhynchos domesticus, Anser anser y Cairina moschata). Regatas fue el sitio con mayor diversidad de peces (n = 17) que representa un 10.43% de la ictiofauna del Río de la Plata (n = 163). Este sitio alberga un 13% de las especies de aves asociadas a cuerpos de agua registrados en la Ciudad de Buenos Aires (n = 107). Al comparar la riqueza específica entre las lagunas, encontramos una gran similitud entre Regatas y Planetario. Además, ambos sitios presentaron la mayor riqueza específica de peces durante los meses de enero y febrero. A partir de este estudio preliminar, fue posible describir y diferenciar cada laguna por su fauna y características físicas, y también constituye la base para continuar con estudios adicionales de las comunidades que permitan el desarrollo de las pautas de manejo necesarias para la protección de Lago Tres de febrero
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Diversidad de vertebrados acuáticos de tres humedales urbanos de la ciudad de Buenos Aires
2018Co-Authors: Llamazares Vegh S., Villatarco Vázquez A. P., Kunert M. C., Tombari, Andrea D.Abstract:The urban wetlands are sites of high biodiversity that are under a great anthropogenic pressure. In the city of Buenos Aires, one of the more important areas of recreation is constituted by Parque Tres de Febrero (well-known as like “Bosques de Palermo”), that conforms a green zone of 25 ha. In this area there are artificial wetlands of diverse physical characteristics. In the present work, the goal is to determine vertebrate’s diversity in these urban aquatic enviroments in order to evaluate the degree of impact of the recreational activity on the conservation of the vertebrates associated to the water bodies. The study was carried out in three artificial lagoons included in the park: Regatas, Rosedal and Planetario. Altogether, seventeen species of fish (Prochilodus lineatus, Oligosarcus jenynsii, Cheirodon interruptus, Bryconamericus iheringii, Hoplias malabaricus, Hypostomus commersoni, Rhamdia quelen, Pimelodus albicans, Pimelodus maculatus, Cyprinus carpio carpio, Cnesterodon decemmaculatus, Gambusia affinis, Jenynsia multidentata, Synbranchus marmoratus, Australoheros facetus, Gymnogeophagus meridionalis and Crenicichla scottii), eighteen species of birds (Podiceps rolland, Podilymbus Podiceps, Podiceps major, Phalacrocorax olivaceus, Ardea alba, Egretta thula, Butorides striatus, Nycticorax nycticorax, Anas georgica, Anas platyrhynchos, Anas platyrhynchos domesticus, Anser anser, Cairina moschata, Netta peposaca, Aramus guarauna, Fulica armillata, Fulica leucoptera and Chloroceyle amazona), three species of turtles (Phrynops hilarii, Trachemys scripta elegans and Trachemys venusta) and one species of mammal were registered (Myocastor coipo). Among these species, eight are introduced: two fishes (Cyprinus carpio carpio and Gambusia affinis), two turtles (Trachemys scripta elegans and Trachemys venusta) and four birds (Anas platyrhynchos, Anas platyrhynchos domesticus, Anser anser and Cairina moschata). Regatas was the site with greater diversity of fishes (n=17) that represents a 10.43% of Río de la Plata’s ichthyofauna (n=163). This site lodges a 13% of the bird species associated to registered water bodies in the City of Buenos Aires (n=107). When comparing the specific richness among lagoons, we found high similarity between Regatas and Planetarium. Also, both sites presented the greatest specific richness of fish during the months of January and February. From this preliminary study it was possible to describe and to differentiate each lagoon by its fauna and physical characteristics, and also it constitutes the base to continue with further studies of communities which allow the development of the necessary guidelines of handling for the protection of Lagos Tres de Febrero.Instituto de Limnología "Raúl A. Ringuelet
Rodney A. Bray - One of the best experts on this subject based on the ideXlab platform.
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Taxonomic revision of Joyeuxilepis Spassky, 1947 (Cestoda: Amabiliidae): redescriptions of J. biuncinata (Joyeux & Baer, 1943), J. decacantha (Fuhrmann, 1913) and J. pilatus Borgarenko & Gulyaev, 1991
Systematic Parasitology, 2003Co-Authors: Gergana P Vasileva, David I. Gibson, Rodney A. BrayAbstract:Two species of Joyeuxilepis Spassky, 1947 are redescribed from Tachybaptus ruficollis in Bulgaria: J. biuncinata (Joyeux & Baer, 1943) and J. pilatus Borgarenko & Gulyaev, 1991. The syntypes of J. decacantha (Fuhrmann, 1913) from Podiceps cristatus in Sweden and voucher specimens of J. pilatus (identified as ‘ Tatria decacantha ’) from T. ruficollis in England (new geographical record) from the British Museum (Natural History) Collection are also re-described. The voucher specimens and cysticercoids of Tatria spp. from dragonfly nymphs in Wales recorded by Rees (1973) were re-examined. Previous records of J. biuncinata , J. decacantha and J. pilatus are critically analysed in view of the present results. The major reliable diagnostic characters for species of Joyeuxilepis are presented and the distinguishing criteria for the three species studied are re-evaluated.
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Taxonomic revision of Tatria Kowalewski, 1904 (Cestoda: Amabiliidae): redescriptions of T. appendiculata Fuhrmann, 1908 and T. duodecacantha Olsen, 1939, a key and an amended diagnosis of Tatria (sensu stricto)
Systematic Parasitology, 2003Co-Authors: Gergana P Vasileva, David I. Gibson, Rodney A. BrayAbstract:Tatria appendiculata Fuhrmann, 1908 is redescribed on the basis of syntypes from Tachybaptus dominicus in Brazil and voucher specimens from the same host species in Cuba previously recorded by Rysavy & Macko (1971). Paratypes of T. duodecacantha Olsen, 1939 from Podilymbus Podiceps in the USA are also redescribed and, in contrast with the opinion of Ryzhikov & Tolkacheva (1981), the species is recognised as valid. The major reliable diagnostic characters of Tatria and the distinguishing criteria applicable at the species level are re-evaluated. An amended generic diagnosis of Tatria ( sensu stricto ) and an identification key to its constituent species are presented.
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Taxonomic revision of Tatria Kowalewski, 1904 (Cestoda: Amabiliidae): redescriptions of T. biremis Kowalewski, 1904 and T. minor Kowalewski, 1904, and the description of T. gulyaevi n. sp. from Palaearctic grebes
Systematic Parasitology, 2003Co-Authors: Gergana P Vasileva, David I. Gibson, Rodney A. BrayAbstract:Two species of Tatria Kowalewski, 1904 are redescribed from grebes in Bulgaria: T. biremis Kowalewski, 1904 (specimens from Podiceps nigricollis ) and T. minor Kowalewski, 1904 (specimens from P. cristatus and P. nigricollis ). T. mircia Gulyaev, 1990 is synonymised with T. minor . The previous records of T. biremis , T. minor and T. mircia are critically analysed in view of the present results. T. gulyaevi n. sp. is described from P. nigricollis from Bulgaria and the Czech Republic and from an unidentified grebe species from Turkey. Some of the previous records of T. minor and T. biremis are recognised as belonging to T. gulyaevi . One specimen illustrated by Kowalewski (1904) is designated as a lectotype of T. minor in order to stabilise the nomenclatural standing of this species.
Daniel T. Ksepka - One of the best experts on this subject based on the ideXlab platform.
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Fossil grebes from the Truckee Formation (Miocene) of Nevada and a new phylogenetic analysis of Podicipediformes (Aves)
Palaeontology, 2013Co-Authors: Daniel T. Ksepka, Amy M. Balanoff, Michael A. Bell, Michel D. HousemanAbstract:Podicipediformes is a cosmopolitan clade of foot-propelled diving birds that, despite inhabiting marine and lacustrine environments, have a poor fossil record. In this contribution, we describe three new grebe fossils from the diatomite beds of the Late Miocene Truckee Formation (10.2 ± 0.2 Ma) of Nevada (USA). Two postcranial skeletons and an associated set of wing elements indicate that at least two distinct grebe species occupied the large, shallow Lake Truckee during the Miocene. Phylogenetic analysis of morphological data supports a basal divergence between a clade uniting the dabchicks (Tachybaptus, Limnodytes, Poliocephalus) and a clade uniting Podilymbus, Rollandia, Podiceps and Aechmophorus. Missing data, combined with a paucity of informative skeletal characters, make it difficult to place the Truckee grebes within either of these major clades. Given the weak projection of the cnemial crests compared with extant grebes, it also remains plausible that these specimens represent stem lineage grebes. Although more material is needed to resolve the phylogenetic position of the Truckee grebes, our analysis offers insight into the tempo of grebe evolution by placing the Miocene taxon Thiornis sociata within the dabchick clade. Thiornis sociata provides a minimum age calibration of 8.7 Ma for the basal divergence among dabchicks. Based on the recovery of a nonmonophyletic Tachybaptus and placement of the Western Hemisphere ‘Tachybaptus’ dominicus as the basal member of the otherwise exclusively Eastern Hemisphere dabchick clade, we resurrect the genus Limnodytes for this extant species (Limnodytes dominicus). Our results also nest the large, long-necked Aechmophorus grebes within the genus Podiceps, as the sister taxon to Podiceps major.
