Longidorus )22 Helicotylenchus 2 Doli chodorus Belonolaimus 变82 % criconemo aquino >20 5 Xiphinema Tylenchulus Hoplolaimus Rotylenchus x Hemicyclophora Ditylenchus Meloidogyne an 8 Aphelenchoides a- Tylenchorhynchus 12 Trichodorus Radopholus Heterodera 2 Pratylenchus 7 15 uHDe→ Criconemoides 6 Pratylenchus 5OOum 750um 1000um 1250um 1500um 1750um 2000um 2250um 2500um 2750um 300oum FIGURE 15-3 Morphology and relative sizes of some of the most important plant parasitic nematodes线虫的体形因类别而异。 雌雄同形的线虫其成熟雌虫和雄虫均 为蠕虫形，除生殖器官有差别之外，其他 的形态结构都相似。 雌雄异形的线虫其成熟雄虫为蠕虫形， 而雌虫球形、柠檬形或肾形