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At least 19 recordsLinked to original sources
PubMed2001

Tylenchida associated with different crops in Sennar State (Sudan).

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.

Animals↗
PubMed2002

Tylenchida associated with field crops in Tehran and central provinces of Iran.

On a survey of plant parasitic nematodes, belonging to the order Tylenchida, about 500 soil and root samples were collected from different field crops, such as wheat, barley, tomato, potato, corn, beets, eggplants, cuccumber, melon and also other crops cultivated in Tehran and Central Provinces during 1995-2000. All samples were washed and the nematodes were extracted by Centrifugal Flotation Technique. They were fixed and transferred to glycerin, then permanent slides were mounted. Morphological and morphometrical characters of each species were studied. In this study 31 species belonging to 17 genesa of the order Tylenchida were identified as follows. Amplimerlinius macrurus, Anguina tritici, Aphelenchoides centralis, A. limberi, A. parietinus, Aphelenchus avenae, Boleodorus thylactus, Ditylenchus dipsaci, D. destructor, D. kheirii, D. medicaginis, D. myceliophagus, Filenchus cerealis, Irantylenchus clavidorus, Helicotylenchus cavenessi, H. dehystera, H. digonicus, H. pseudodigonicus, H. pseudorobustus, Heterodera avenae, Meloidogyne incognita, M. javanica, Paratylenchus projectus, P. tateae, Pratylenchus neglectus, P. thornei, Psilenchus hilarulus, P. iranicus, Quinisulcius capitatus, Seinura oostenbrink and Zygotylenchus quevarai. The validity of Filenchus cnealis, status of Irantylenchus clavidorus and also distribution of the most economically important species were discussed.

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PubMed2003

Fossil evidence of phorid parasitism (Diptera: Phoridae) by allantonematid nematodes (Tylenchida: Allantonematidae).

Howardula helenoschini sp. n. (Tylenchida: Allantonematidae) is described from 40 million year-old Baltic amber. The nematodes are parasitic in the body cavity of an adult fly of the genus Triphleba (Phoridae: Diptera). Characteristics of the fossil species are the large size of the pre-adult juveniles and a small number of progeny compared with extant Howardula parasites of flies. Reasons are given why these features suggest that this species was at an early stage of adapting, evolutionarily, to its insect host.

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PubMedDate not supplied

[Neoparasitylenchus megabothridis n. sp. (Tylenchida: Allantonematidae) parasite of Megabothris tubidus (Siphonaptera: Ceratophyllidae); observations on fleas tylenchides in the S.W. of Europa (author's transl)].

A number of nematodes (Tylenchida, Allantonematidae) were observed in 11 species of Siphonaptera from the South-West of Europe. The fleas belong of 4 differents families (Pulicidae, Vermipsyllidae,Hystrichopsyllidae, Ceratophyllidae). Neoparasitylenchus megabothridis n. sp., parasite of the flea Megabothris turbidus (Rothschild, 1909), is described and the life cycle given. It shows little pathogenicity to tis host. Psyllotylenchus sp. parasite of Nosopsyllus fasciatus (Bosc, 1801), appears to be a teratogenic and causes a feminisation of parasitised males and a masculinisation of females. A generic determination cannot be made with any certainty in the material collected from others fleas.

Animals↗
PubMed1983

[Spilotylenchus arthuri, gen. n., sp. n. (Nematodea, Tylenchida: Allantonematidae), parasite of Spilopsyllus cuniculi (Dale, 1878) (Siphonaptera: Pulicidae)].

Spilotylenchus arthuri gen. n., sp. n. (Nematodea, Tylenchida: Allantonematidae) parasite of the European rabbit flea Spilopsyllus cuniculi (Dale, 1878) is described from a material including parasitic females so as freeliving adults, male and female. Neoparasitylenchus megabothridis Laumond et Beaucournu, 1977 and N. laplandicus Rubtzov et Darskaya, 1981, are held to belong to this new genus. S. arthuri produce a locking of the oogenesis in female fleas.

Animals↗
PubMed1984

[Psyllotylenchus chabaudi, n. sp. (Nematodea, Tylenchida: Allantonematidae), a parasite of Nosopsyllus fasciatus (Bosc) (Siphonaptera: Ceratophyllidae)].

The authors describe a new species of entomogenous Nematoda: Psyllotylenchus chabaudi n. sp. (Tylenchida: Allantonematidae) parasite of Nosopsyllus fasciatus (Bosc) (Siphonaptera: Ceratophyllidae), a rat flea, accidentally present on Oryctolagus cuniculus. The new species of Allantonematidae presents in particular a very large preuteral gland. A comparison between the species of the genus Psyllotylenchus which are actually considered as valid is given in the diagnosis.

Animals↗
PubMed2002

Description of Tylenchorhynchus shimizui n. sp. from Paraguay and notes on T. leviterminalis Siddiqi, Mukherjee & Dasgupta from Japan (Nematoda: Tylenchida: Telotylenchidae).

A new species of Tylenchorhynchus Cobb, 1913 from Paraguay, T. shimizui n. sp., and T. leviterminalis Siddiqi, Mukherjee & Dasgupta, 1982 from Japan are described and illustrated. T. shimizui n. sp. is a monosexual species characterised by females with a medium-sized body, L=0.70-0.82 mm, stylet 18.4-20.8 microm long, a rounded lip region slightly set off from the body contours bearing six annules, oesophageal glands slightly overlapping the intestine laterally and a subcylindrical tail with a bluntly pointed smooth terminus. A population of T. leviterminalis associated with sugarcane from Japan is also described and compared with previous descriptions. This is the first record for T. leviterminalis in Japan. Spores of a Pasteuria species were observed filling the body-cavity of some specimens of T. leviterminalis.

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PubMed2004

Evolution of the gall-forming plant parasitic nematodes (Tylenchida: Anguinidae) and their relationships with hosts as inferred from Internal Transcribed Spacer sequences of nuclear ribosomal DNA.

Phylogenetic relationships among gall-forming plant parasitic nematodes of the subfamily Anguininae are reconstructed by maximum parsimony and maximum likelihood analyses. Sequences of the ITS of rDNA from 53 populations and species of gall-forming nematodes and five populations of the Ditylenchus dipsaci species complex were analysed. The phylogenetic trees strongly support monophyly of the genus Anguina and show nonmonophyly for the genera Mesoanguina and Heteroanguina. Morphological and biological characters are generally congruent with the anguinid groups identified in the rDNA phylogeny. Analyses of evolution of different gall types among anguinids reveal that there are apparent evolutionary trends in gall evolution: from abnormal swelling and growth of infested plant organs toward small localised galls, and from infestation of vegetative toward generative organs. Our study demonstrates that the main anguinid groups are generally associated with host plants belonging to the same or related systematic groups. The comparison of the ITS phylogenies of anguinids parasitising Poaceae and their host grasses shows a high level of cospeciation events.

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PubMed2006

'Candidatus Paenicardinium endonii', an endosymbiont of the plant-parasitic nematode Heterodera glycines (Nemata: Tylenchida), affiliated to the phylum Bacteroidetes.

Bacteria-like endosymbionts of females of the plant-parasitic nematodes Globodera rostochiensis and Heterodera goettingiana and juveniles of Heterodera glycines were first observed during transmission electron microscopy (TEM) studies conducted in the 1970s. These organisms were characterized as being rod-shaped, ranging in size from 0.3 to 0.5 microm in diameter and 1.8 to 3 microm in length and containing structures labelled as striated inclusion bodies or tubular structures. A population of H. glycines was obtained from the soybean field where infected nematodes were first discovered in order to conduct TEM studies of females and males and to determine the phylogenetic position of the H. glycines endosymbiont among bacteria by studying the 16S rRNA and gyrB gene sequences. The bacterium was observed in the pseudocoelom and intestine of juveniles, females and males, in hypodermal chords of juveniles and males, in ovary walls and in oocytes and spermatozoa. The bacterium was polymorphic, measuring 0.4-0.8 x 2.5-4.5 microm, and many specimens contained an array of microfilament-like structures similar to those observed in "Candidatus Cardinium hertigii", the endosymbiont of Encarsia spp. wasps. Phylogenetic analysis of the 16S rRNA and gyrB genes of the H. glycines-infecting bacterium revealed 93 % and 81 % sequence identity, respectively, to the homologous genes in "Candidatus C. hertigii". Thus, the name "Candidatus Paenicardinium endonii" is proposed for the bacterial endosymbiont of the plant-parasitic nematode H. glycines.

Actin Cytoskeleton↗