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Fredrik Pleijel - One of the best experts on this subject based on the ideXlab platform.
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a New Taxon capricornia hesionidae polychaeta illustrating the litu least inclusive Taxonomic unit concept
Zoologica Scripta, 2000Co-Authors: Fredrik Pleijel, Rouse W GregAbstract:Phylogenetic Taxonomy is applied for the systematization of a New Hesionidae, rather than the traditional Linnean system, with an apomorphy-based definition of the name and without reference to rank. It is argued that biological diversity is better represented without species concepts, but that it is useful to specify when a name refers to a smallest known clade which currently cannot be further subdivided; for this we apply the Newly introduced concept LITU (Least-Inclusive Taxonomic Unit) for the New Taxon. LITUs are made identifiable by being italicised with lower-case initial letter; all other Taxon names are italicised with capital initial letter. The Hesionidae is accordingly named capricornia, New Taxon, and was found in shallow water at One Tree Island, Capricorn Group, southernmost part of the Great Barrier Reef. capricornia is small (length < 2 mm), and exhibits a number of larval Hesionidae characters, but is characterized by large paired ventrally situated penes on segment 9 in adult males. A cladistic parsimony analysis based on morphological characters of capricornia and a selection of other Hesionidae indicates that it belongs within Gyptini Pleijel 1998, and is the sister group of AmphidurosHartman (1959).
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A New Taxon, capricornia (Hesionidae, Polychaeta), illustrating the LITU (‘Least‐Inclusive Taxonomic Unit’) concept
Zoologica Scripta, 2000Co-Authors: Fredrik Pleijel, W Rouse GregAbstract:Phylogenetic Taxonomy is applied for the systematization of a New Hesionidae, rather than the traditional Linnean system, with an apomorphy-based definition of the name and without reference to rank. It is argued that biological diversity is better represented without species concepts, but that it is useful to specify when a name refers to a smallest known clade which currently cannot be further subdivided; for this we apply the Newly introduced concept LITU (Least-Inclusive Taxonomic Unit) for the New Taxon. LITUs are made identifiable by being italicised with lower-case initial letter; all other Taxon names are italicised with capital initial letter. The Hesionidae is accordingly named capricornia, New Taxon, and was found in shallow water at One Tree Island, Capricorn Group, southernmost part of the Great Barrier Reef. capricornia is small (length
Kerry B Walsh - One of the best experts on this subject based on the ideXlab platform.
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phylogenetic positions of phytoplasmas associated with dieback yellow crinkle and mosaic diseases of papaya and their proposed inclusion in candidatus phytoplasma australiense and a New Taxon candidatus phytoplasma australasia
International Journal of Systematic and Evolutionary Microbiology, 1998Co-Authors: D T White, Linda L Blackall, Paul T Scott, Kerry B WalshAbstract:DNA extracted from three papaya (Carica papaya L.) plants, individually affected by dieback, yellow crinkle or mosaic diseases, was subjected to PCR using phytoplasma-specific primers to amplify the 16S rRNA gene plus 16S–23S rRNA intergenic spacer region. Near-complete DNA sequences obtained for the three PCR amplimers were subjected to phylogenetic analyses and direct sequence comparison with other phytoplasma 16S rDNA and 16S-23S spacer region DNA sequences. The papaya yellow crinkle (PpYC) and papaya mosaic (PpM) sequences were identical to each other, but distinctly different from the papaya dieback (PpDB) sequence, showing 90.3% identity in the 16S rDNA and 87.8% identity in the 16S–23S spacer region DNA sequences. A phylogenetic tree based on 16S rDNA sequences was calculated, in which PpYC and PpM are most closely related to the tomato big bud phytoplasma (TBB; 99.7% 16S rDNA sequence identity) from Australia, within subclade iii. This subclade consists of strains only reported occurring in the Southern Asian region and Australia, which indicates an Asian/Australasian origin. PpDB is most closely related to the Phormium yellow leaf phytoplasma from New Zealand (PYL; 99.9% identity) and the Australian grapevine yellows phytoplasma (AGY; 99.7% identity). These three phytoplasma strains form a distinct clade within subclade xii, which also includes the European strains STOL and VK as another distinct clade. The origin of the closely related but geographically separated AGY-like strains and STOL-like strains of subclade xii is unclear. It is proposed that phytoplasma strains PpDB, PYL and AGY be included in the previously described Taxon ‘Candidatus Phytoplasma australiense’, and that PpYC PpM and TBB be assigned to a New Taxon, ‘Candidatus Phytoplasma australasia’.
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Phylogenetic positions of phytoplasmas associated with dieback, yellow crinkle and mosaic diseases of papaya, and their proposed inclusion in 'Candidatus Phytoplasma australiense' and a New Taxon, 'Candidatus Phytoplasma australasia'.
International journal of systematic bacteriology, 1998Co-Authors: D T White, Linda L Blackall, Paul T Scott, Kerry B WalshAbstract:DNA extracted from three papaya (Carica papaya L.) plants, individually affected by dieback, yellow crinkle or mosaic diseases, was subjected to PCR using phytoplasma-specific primers to amplify the 16S rRNA gene plus 16S-23S rRNA intergenic spacer region. Near-complete DNA sequences obtained for the three PCR amplimers were subjected to phylogenetic analyses and direct sequence comparison with other phytoplasma 16S rDNA and 16S-23S spacer region DNA sequences. The papaya yellow crinkle (PpYC) and papaya mosaic (PpM) sequences were identical to each other, but distinctly different from the papaya dieback (PpDB) sequence, showing 90.3% identity in the he 16S rDNA and 87.8% identity in the 16S-23S spacer region DNA sequences. A phylogenetic tree based on 16S rDNA sequences was calculated, in which PpYC and PpM are most closely related to the tomato big bud phytoplasma (TBB; 99.7% 16S rDNA sequence identity) from Australia, within subclade iii. This subclade consists of strains only reported occurring in the Southern Asian region and Australia, which indicates an Asian/Australasian origin. PpDB is most closely related to the Phormium yellow leaf phytoplasma from New Zealand (PYL; 99.9% identity) and the Australian grapevine yellows phytoplasma (AGY; 99.7% identity). These three phytoplasma strains form a distinct clade within subclade xii, which also includes the European strains STOL and VK as another distinct clade. The origin of the closely related but geographically separated AGY-like strains and STOL-like strains of subclade xii is unclear. It is proposed that phytoplasma strains PpDB, PYL and AGY be included in the previously described Taxon 'Candidatus Phytoplasma australiense', and that PbYC, PpM and TBB be assigned to a New Taxon, "Candidatus Phytoplasma australasia'.
W Rouse Greg - One of the best experts on this subject based on the ideXlab platform.
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A New Taxon, capricornia (Hesionidae, Polychaeta), illustrating the LITU (‘Least‐Inclusive Taxonomic Unit’) concept
Zoologica Scripta, 2000Co-Authors: Fredrik Pleijel, W Rouse GregAbstract:Phylogenetic Taxonomy is applied for the systematization of a New Hesionidae, rather than the traditional Linnean system, with an apomorphy-based definition of the name and without reference to rank. It is argued that biological diversity is better represented without species concepts, but that it is useful to specify when a name refers to a smallest known clade which currently cannot be further subdivided; for this we apply the Newly introduced concept LITU (Least-Inclusive Taxonomic Unit) for the New Taxon. LITUs are made identifiable by being italicised with lower-case initial letter; all other Taxon names are italicised with capital initial letter. The Hesionidae is accordingly named capricornia, New Taxon, and was found in shallow water at One Tree Island, Capricorn Group, southernmost part of the Great Barrier Reef. capricornia is small (length
Rouse W Greg - One of the best experts on this subject based on the ideXlab platform.
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a New Taxon capricornia hesionidae polychaeta illustrating the litu least inclusive Taxonomic unit concept
Zoologica Scripta, 2000Co-Authors: Fredrik Pleijel, Rouse W GregAbstract:Phylogenetic Taxonomy is applied for the systematization of a New Hesionidae, rather than the traditional Linnean system, with an apomorphy-based definition of the name and without reference to rank. It is argued that biological diversity is better represented without species concepts, but that it is useful to specify when a name refers to a smallest known clade which currently cannot be further subdivided; for this we apply the Newly introduced concept LITU (Least-Inclusive Taxonomic Unit) for the New Taxon. LITUs are made identifiable by being italicised with lower-case initial letter; all other Taxon names are italicised with capital initial letter. The Hesionidae is accordingly named capricornia, New Taxon, and was found in shallow water at One Tree Island, Capricorn Group, southernmost part of the Great Barrier Reef. capricornia is small (length < 2 mm), and exhibits a number of larval Hesionidae characters, but is characterized by large paired ventrally situated penes on segment 9 in adult males. A cladistic parsimony analysis based on morphological characters of capricornia and a selection of other Hesionidae indicates that it belongs within Gyptini Pleijel 1998, and is the sister group of AmphidurosHartman (1959).
Rodion Gorchakov - One of the best experts on this subject based on the ideXlab platform.
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negevirus a proposed New Taxon of insect specific viruses with wide geographic distribution
Journal of Virology, 2013Co-Authors: Nikos Vasilakis, Naomi L Forrester, Gustavo Palacios, Farooq Nasar, Nazir Savji, Shannan L Rossi, Hilda Guzman, Thomas G Wood, Vsevolod L Popov, Rodion GorchakovAbstract:Six novel insect-specific viruses, isolated from mosquitoes and phlebotomine sand flies collected in Brazil, Peru, the United States, Ivory Coast, Israel, and Indonesia, are described. Their genomes consist of single-stranded, positive-sense RNAs with poly(A) tails. By electron microscopy, the virions appear as spherical particles with diameters of ∼45 to 55 nm. Based on their genome organization and phylogenetic relationship, the six viruses, designated Negev, Ngewotan, Piura, Loreto, Dezidougou, and Santana, appear to form a New Taxon, tentatively designated Negevirus. Their closest but still distant relatives are citrus leposis virus C (CiLV-C) and viruses in the genus Cilevirus, which are mite-transmitted plant viruses. The negeviruses replicate rapidly and to high titer (up to 10(10) PFU/ml) in mosquito cells, producing extensive cytopathic effect and plaques, but they do not appear to replicate in mammalian cells or mice. A discussion follows on their possible biological significance and effect on mosquito vector competence for arboviruses.
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Negevirus — a proposed New Taxon of insect-specific viruses with wide geographic distribution
Journal of virology, 2012Co-Authors: Nikos Vasilakis, Naomi L Forrester, Gustavo Palacios, Farooq Nasar, Nazir Savji, Shannan L Rossi, Hilda Guzman, Thomas G Wood, Vsevolod L Popov, Rodion GorchakovAbstract:Six novel insect-specific viruses, isolated from mosquitoes and phlebotomine sand flies collected in Brazil, Peru, the United States, Ivory Coast, Israel, and Indonesia, are described. Their genomes consist of single-stranded, positive-sense RNAs with poly(A) tails. By electron microscopy, the virions appear as spherical particles with diameters of ∼45 to 55 nm. Based on their genome organization and phylogenetic relationship, the six viruses, designated Negev, Ngewotan, Piura, Loreto, Dezidougou, and Santana, appear to form a New Taxon, tentatively designated Negevirus. Their closest but still distant relatives are citrus leposis virus C (CiLV-C) and viruses in the genus Cilevirus, which are mite-transmitted plant viruses. The negeviruses replicate rapidly and to high titer (up to 10(10) PFU/ml) in mosquito cells, producing extensive cytopathic effect and plaques, but they do not appear to replicate in mammalian cells or mice. A discussion follows on their possible biological significance and effect on mosquito vector competence for arboviruses.