The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
J. Deunff - One of the best experts on this subject based on the ideXlab platform.
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Un spilotylenchus nouveau
EDP Sciences, 1Co-Authors: H Launay, J. DeunffAbstract:Spilotylenchus beaucournui sp. n. (Nematodea, Tylenchida : Allantonematidae) parasite du Siphonaptère Spilotylenchus cuniculi (Dale), inféodé au lapin de garenne, est décrit et comparé aux autres espèces appartenant au genre Spilotylenchus. Ce nématode provoque un blocage de l’oogenèse chez les puces femelles
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n. sp. (Nematodea, Tylenchida : Allantonematidae), parasite de
EDP Sciences, 1Co-Authors: J. Deunff, H LaunayAbstract:Les auteurs décrivent une nouvelle espèce de Nématode entomogène : Psyllotylenchus chabaudi n. sp. (Tylenchida : Allantonematidae) parasite de Nosopsyllus fasciatus (Bosc) (Siphonaptera : Ceratophyllidae), puce du rat, accidentellement présente sur Oryctolagus cuniculus.La nouvelle espèce d'Allantonematidae présente en particulier une volumineuse glande préutérale. Une comparaison des espèces du genre Psyllotylenchus actuellement considérées comme valides est donnée dans la diagnose
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n. gen., n. sp.
EDP Sciences, 1Co-Authors: J. Deunff, H Launay, J. C. BeaucournuAbstract:Incurvinema helicoides n. gen., n. sp. (Nematodea, Tylenchida : Allantonematidae) parasite du Siphonaptère Rhadinopsylla pentacantha (Rothschild, 1897) inféodé aux Arvicolidae est décrit à partir de puces de nids de Talpa europaea. Le cycle, la spécificité et l’impact sur l’hôte sont présentés et discutés. Le nouveau genre se sépare facilement de Psyllotylenchus par les femelles gamogénétiques parasites à courbure ventrale et les femelles parthénogénétiques dont la glande préutérale, de petite taille, n’est pas sphérique
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, gen. n., sp. n. (Nematodea, Tylenchida : Allantonematidae), parasite de
EDP Sciences, 1Co-Authors: H Launay, J. Deunff, O BainAbstract:Spilotylenchus arthuri gen. n., sp. n. (Nematodea, Tylenchida : Allantonematidae) parasite du Siphonaptère Spilopsyllus cuniculi (Dale, 1878) inféodé au lapin de garenne, est décrit à partir d’un matériel provenant de la région parisienne et comprenant des femelles parasites et des adultes, mâles et femelles, libres. Neoparasitylenchus megabothridis Laumond et Beaucournu, 1977 et N. laplandicus Rubtzov et Darskaya, 1981, sont considérés comme appartenant à ce nouveau genre. S. arthuri provoque un blocage de l’oogénèse chez les puces femelles
H Launay - One of the best experts on this subject based on the ideXlab platform.
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Un spilotylenchus nouveau
EDP Sciences, 1Co-Authors: H Launay, J. DeunffAbstract:Spilotylenchus beaucournui sp. n. (Nematodea, Tylenchida : Allantonematidae) parasite du Siphonaptère Spilotylenchus cuniculi (Dale), inféodé au lapin de garenne, est décrit et comparé aux autres espèces appartenant au genre Spilotylenchus. Ce nématode provoque un blocage de l’oogenèse chez les puces femelles
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n. sp. (Nematodea, Tylenchida : Allantonematidae), parasite de
EDP Sciences, 1Co-Authors: J. Deunff, H LaunayAbstract:Les auteurs décrivent une nouvelle espèce de Nématode entomogène : Psyllotylenchus chabaudi n. sp. (Tylenchida : Allantonematidae) parasite de Nosopsyllus fasciatus (Bosc) (Siphonaptera : Ceratophyllidae), puce du rat, accidentellement présente sur Oryctolagus cuniculus.La nouvelle espèce d'Allantonematidae présente en particulier une volumineuse glande préutérale. Une comparaison des espèces du genre Psyllotylenchus actuellement considérées comme valides est donnée dans la diagnose
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n. gen., n. sp.
EDP Sciences, 1Co-Authors: J. Deunff, H Launay, J. C. BeaucournuAbstract:Incurvinema helicoides n. gen., n. sp. (Nematodea, Tylenchida : Allantonematidae) parasite du Siphonaptère Rhadinopsylla pentacantha (Rothschild, 1897) inféodé aux Arvicolidae est décrit à partir de puces de nids de Talpa europaea. Le cycle, la spécificité et l’impact sur l’hôte sont présentés et discutés. Le nouveau genre se sépare facilement de Psyllotylenchus par les femelles gamogénétiques parasites à courbure ventrale et les femelles parthénogénétiques dont la glande préutérale, de petite taille, n’est pas sphérique
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, gen. n., sp. n. (Nematodea, Tylenchida : Allantonematidae), parasite de
EDP Sciences, 1Co-Authors: H Launay, J. Deunff, O BainAbstract:Spilotylenchus arthuri gen. n., sp. n. (Nematodea, Tylenchida : Allantonematidae) parasite du Siphonaptère Spilopsyllus cuniculi (Dale, 1878) inféodé au lapin de garenne, est décrit à partir d’un matériel provenant de la région parisienne et comprenant des femelles parasites et des adultes, mâles et femelles, libres. Neoparasitylenchus megabothridis Laumond et Beaucournu, 1977 et N. laplandicus Rubtzov et Darskaya, 1981, sont considérés comme appartenant à ce nouveau genre. S. arthuri provoque un blocage de l’oogénèse chez les puces femelles
James G. Baldwin - One of the best experts on this subject based on the ideXlab platform.
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Mitochondrial genomes advance phylogenetic hypotheses for Tylenchina (Nematoda: Chromadorea)
Zoologica Scripta, 2015Co-Authors: Jiyeon Kim, Taeho Kim, Sang-hwa Lee, Mohiuddin Gazi, Daewui Jung, Jae-yong Chun, Sanghee Kim, Tae-kun Seo, Chungoo Park, James G. BaldwinAbstract:000. Within the nematode class Chromadorea, the suborder Tylenchina is an ecologically and morphologically diverse assemblage of nematodes that includes free-living microbivores, fungivores and various types of plant parasites. A recent nematode classification system based largely on SSU rDNA phylogenetic trees classified suborder Tylenchina to include four infraorders: Panagrolaimomorpha, Cephalobomorpha, Tylenchomorpha and Drilonematomorpha, and phylogenetic relationships among species of these infraorders have not always been robustly supported. In this study, we determined the complete mitochondrial genome sequences of three Tylenchina species (Aphelenchus avenae [Aphelenchidae, Tylenchomorpha], Halicephalobus gingivalis, Panagrellus redivivus [Panagrolaimomorpha]) and the partial genome sequence of Acrobeles complexus (Cephalobomorpha) and used these sequences to infer phylogenetic relationships among representatives of the Tylenchina and other nematodes. Phylogenetic analysis of amino acid sequences for 12 protein-coding genes of 100 nematode species supports monophyly of: Chromadorea, Spiruromorpha, Oxyuridomorpha, Ascarididae + Toxocaridae + Anisakidae, Meloidogynidae + PraTylenchidae + Heteroderidae and Aphelenchoidea. Bayesian and maximum-likelihood analyses also show the nested position of Diplogasteromorpha within Rhabditomorpha, and Rhigonematomorpha within Ascaridomorpha. These analyses also show non-monophyly of: clade III, Ancylostomatidae, Panagrolaimomorpha, Tylenchina and Tylenchomorpha. Reconstructed mitochondrial genome phylogeny also revealed that among two main Tylenchomorpha groups, the monophyletic group representing Aphelenchoidea species was sister to the large clade consisting of Ascaridomorpha, Diplogasteromorpha, Rhabditomorpha and Rhigonematomorpha and some Panagrolaimomorpha species, whereas Tylenchoidea species were sister to the most inclusive assemblage containing all infraordinal groups of Chromadorea, except for P. redivivus (Panagrolaimomorpha) and Acrobeles complexus (Cephalobomorpha). The monophyly of Aphelenchoidea (i.e. sister relationship between Aphelenchidae and Aphelenchoididae) recovered in this study indicates that similarity in certain aspects of pharyngeal structure between these two families appears best explained by common ancestry, rather than convergent evolution.
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Phylogenetic analysis of Tylenchida Thorne, 1949 as inferred from D2 and D3 expansion fragments of the 28S rRNA gene sequences
Nematology, 2006Co-Authors: Sergei A. Subbotin, Dieter Sturhan, Vladimir N. Chizhov, Nicola Vovlas, James G. BaldwinAbstract:The evolutionary relationships of 82 species of tylenchid and aphelenchid nematodes were evaluated by use of sequence data of the D2 and D3 expansion fragments of the 28S ribosomal RNA genes. Nine automatic and one culled sequence alignments were analysed using maximum parsimony and Bayesian inference approaches. The molecular data sets showed that the order Tylenchida comprises lineages that largely correspond to two suborders, Hoplolaimina and Criconematina, and other taxonomic divisions as proposed by Siddiqi (2000). Several significant results also derived from our study include: i) the basal position of groups that include entomoparasitic nematodes within tylenchid trees; ii) paraphyly of the superfamily Dolichodoroidea sensu Siddiqi (2000); iii) evidence for a Pratylenchus, Hirschmanniella and Meloidogyne clade; and iv) lack of support for widely held traditional placement of Radopholus within PraTylenchidae and placement of this genus within Hoplolaimidae or Heteroderidae. Congruence and incongruence of molecular phylogeny and traditional classifications and morphological-based hypotheses of phylogeny of tylenchids are discussed.
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Fine structure and phylogenetic significance of a muscular basal bulb in Basiria gracilis Thorne, 1969 (Nematoda: Tylenchidae)
Nematology, 2001Co-Authors: James G. Baldwin, Ricardo Moreira Souza, Claudia DolinskiAbstract:Classical hypotheses of the phylogenetic position of Tylenchida within Secernentea are evaluated considering the comparative fine structure of the basal bulb of the pharynx of Basiria gracilis, putatively a representative of the most morphologically conserved members of the order. Unlike other Tylenchida examined in detail, B. gracilis has a full complement of nonglandular cells in the basal bulb including 13 radial muscle cells and six marginal cells. With respect to types and numbers of cells, the basal bulb of B. gracilis most nearly resembles representatives of Cephalobina, differing only by three vs five gland cells. There are more muscle cells in the basal bulb of B. gracilis than in representatives of Rhabditina (ten muscles) and Diplogastrina (six muscles). Considering Teratocephalus as a representative of the outgroup (to establish character polarity), B. gracilis appears to retain most of the conserved features of the basal bulb of Secernentea, with the exception of loss of a heavily cuticularised grinder valve or pump.
Etienne Geraert - One of the best experts on this subject based on the ideXlab platform.
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Functional And Detailed Morphology of the Tylenchida Nematoda
2006Co-Authors: Etienne GeraertAbstract:Chapter 1: Characterization of the Tylenchida Chapter 2: Morphometric behaviour and functional morphology Chapter 3: The body wall Chapter 4: The nervous system Chapter 5: The head Chapter 6: The digestive system Chapter 7: The female genital system Chapter 8: The male genital system.
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Tylenchida associated with different crops in Sennar State (Sudan).
Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen), 2001Co-Authors: Gaa Elbadri, Wim Bert, Etienne GeraertAbstract:A study was done on the taxonomy and morphology of plant parasitic nematodes (Tylenchida) found in Sennar State (Sudan). Sixty samples of different crops were collected in the sugarcane area. Thirty samples originated from soil around the roots of Saccharum officinarum (sugarcane) from different ratoons and thirty samples were collected from other crops (Mangifera indica; Citrus limon; Citrus aurantifolia; Citrus paradisi; Citrus sinensis, Phoenix dactylifera, Musa sapentium; Cassia italica, Capsicum annuum, Sorghum bicolor, Sorghum sudanensis, Gossypium barbadense, Ficus nitida, Khaya senegalensis, Eucalyptus microtheca, Acacia nilotica, Acacia seyal, Azardichta indica, Cajanus cajana, Caltropsis spp. and Liguster ovalifolium). Seven species belonging to seven different genera of Tylenchida were identified: Paratrophurus lobatus, Scutellonema clathricaudatum, Hoplolaimus aegypti and Filenchus cylindricus. Helicotylenchus plumariae, Pratylenchus thornei and Malenchus andrassyi are new records for Sudan. These seven species were compared with the descriptions given in the literature and differences and variations were discussed. Additional morphological data were described by means of SEM microscopy.
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Comparison of the oesophageal structure in Aphelenchoides and Hoplolaimus (Tylenchida: Nematoda)
Nematologica, 1997Co-Authors: Etienne GeraertAbstract:Within the order Tylenchida the number of oesophageal cells could be expected to be constant; comparison of published information on Aphelenchoides and Hoplolaimus suggests there are similar sets of cells. In Aphelenchoides the first set of radial cells is very elongated (from head framework to metacorpus) and subsequent radial cells are all compressed in the metacorpus. In Hoplolaimus the sets of radial cells are more regular in length, but the first set (six stylet protractor muscles) shows a similar, complicated structure. These similarities confirm that the Aphelenchina represent a suborder of the Tylenchida.
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Some species of Tylenchida (Nematoda) from Papua New Guinea.
1995Co-Authors: Alberto Troccoli, Etienne GeraertAbstract:Eight species of Tylenchida are recorded from Papua New Guinea. A detailed study of Sakia indica supported the inclusion of the genus Sakia in the family Tylenchinae, subfamily Tylenchinae: SEM showed a wedge-shaped labial area not found in any other tylench but reminiscent of what has been found in Filenchus. SEM of Filenchus discrepans was similar to that already reported. Morpho-anatomical observations on six other species of Tylenchida frequently detected in Papua are provided.
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The Oesophago-Intestinal Valve and the Intestine in Tylenchids (Nematoda)
Nematologica, 1992Co-Authors: Etienne GeraertAbstract:In the few tylenchids in which the oesophago-intestinal valve structure has been elucidated it consists of two cells; in all cases the actual valve is only a few micrometers long. As in the Rhabditida, the intestine in tylenchids consists essentially of two rows (one dorsal, one ventral) of a few elongated cells. Separate cells with microvilli and a differentiation in anterior and mid-intestine are found in the more primitive families Aphelenchidae, Aphelenchoididae, Tylenchidae, Anguinidae and NeoTylenchidae. In the evolutionary line from Tylenchidae to Heteroderidae cell walls and microvilli progressively disappear. The absence of microvilli indicates the absence of the production of digestive enzymes and the transformation of the intestine into a food storage organ; it is hypothesised that in these cases the intestine selectively absorbs nutrients from the extra-corporal digested plant juice.
Wim Bert - One of the best experts on this subject based on the ideXlab platform.
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Family Tylenchidae (Nematoda): an overview and perspectives
Organisms Diversity & Evolution, 2019Co-Authors: Xue Qing, Wim BertAbstract:Nematodes in the Tylenchidae family are one of the most important soil-inhabiting species, yet little is known about this intriguing group. The present review examines newly collected samples of Tylenchidae from worldwide sources as well as slides from museum collections. Together with all available literature, detailed morphology among genera are summarized and compared, allowing us to explore the importance of each morphological character in a phylogenetic framework. An updated phylogeny inferred from concatenated 18S and 28S ribosomal RNA dataset is reconstructed; the results suggest that not all didelphic genera may be included in Tylenchidae. In fact, our analyses suggest Tylenchidae should be split into several families, although their phylogeny has not yet fully been resolved. Currently, the Tylenchidae family comprises 44 genera and 412 nominal species; however, diversity estimations for the group ranged from 2000 to 10,000 species, meaning that 75–95% of the species remains undiscovered. This is partially because the biased sampling in agro-ecosystems with most Tylenchidae may present in neglected habitats. Finally, we discussed current difficulties in morphology, taxonomy, and molecular phylogeny research of Tylenchidae and the need for multi-gene phylogeny or phylogenomic approaches to resolve the deep phylogeny in Tylenchidae.
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Tylenchida associated with different crops in Sennar State (Sudan).
Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen), 2001Co-Authors: Gaa Elbadri, Wim Bert, Etienne GeraertAbstract:A study was done on the taxonomy and morphology of plant parasitic nematodes (Tylenchida) found in Sennar State (Sudan). Sixty samples of different crops were collected in the sugarcane area. Thirty samples originated from soil around the roots of Saccharum officinarum (sugarcane) from different ratoons and thirty samples were collected from other crops (Mangifera indica; Citrus limon; Citrus aurantifolia; Citrus paradisi; Citrus sinensis, Phoenix dactylifera, Musa sapentium; Cassia italica, Capsicum annuum, Sorghum bicolor, Sorghum sudanensis, Gossypium barbadense, Ficus nitida, Khaya senegalensis, Eucalyptus microtheca, Acacia nilotica, Acacia seyal, Azardichta indica, Cajanus cajana, Caltropsis spp. and Liguster ovalifolium). Seven species belonging to seven different genera of Tylenchida were identified: Paratrophurus lobatus, Scutellonema clathricaudatum, Hoplolaimus aegypti and Filenchus cylindricus. Helicotylenchus plumariae, Pratylenchus thornei and Malenchus andrassyi are new records for Sudan. These seven species were compared with the descriptions given in the literature and differences and variations were discussed. Additional morphological data were described by means of SEM microscopy.
