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Helicotylenchus : ウィキペディア英語版 | Helicotylenchus
''Helicotylenchus'' is a genus of nematodes in the family Hoplolaimidae.〔 They are known generally as spiral nematodes.〔O'Bannon, J. H. and R. N. Inserra. (''Helicotylenchus'' species as crop damaging parasitic nematodes. ) Nematology Circular 165. Florida Department of Agriculture and Consumer Services. 1989.〕 They are found worldwide.〔Subbotin, S. A., et al. (2011). (Diversity and phylogenetic relationships within the spiral nematodes of ''Helicotylenchus'' Steiner, 1945 (Tylenchida: Hoplolaimidae) as inferred from analysis of the D2-D3 expansion segments of 28S rRNA gene sequences. ) ''Nematology'' 13(3), 333-45.〕 They are among the most common parasitic nematodes of plants.〔 ==Description== The female is wormlike and straight or spiral-shaped. The male is similar, but with a smaller anterior end. The body may take a spiral shape after death, if not in life. This ''habitus mortis'' gives the nematodes their common name.〔 Males can be rare, suggesting the nematode often reproduces by parthenogenesis.〔(Genus ''Helicotylenchus''. ) Plant Parasitic Nematodes: An Introduction. North Carolina State University.〕
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