一、引言线虫是一种细长的园虫。多数线虫体长0.3至1毫米,有些达4毫米,而长针线虫属的某些种的线虫体长可超出10毫米;线虫体宽15至35微米,虫体稍透明,两端渐细呈园筒形;有些种类的雌虫膨胀不动,成梨形或柠檬形的椭园体,或成为充满卵的胞囊。线虫体不分节,但被覆以无色而常带有环纹的角质层,角质层下有两层,即下皮层和肌肉层。口部具有乳突接连口腔,它接连具有 First, the introduction of nematodes is a slender garden worm. Most nematodes are 0.3 to 1 mm in length, some 4 mm, while some species of the genus Long-nematode may be 10 mm in length; the nematode is 15 to 35 microns wide and the parasites are slightly more transparent and tapered at both ends Cylindrical; some species of female inflamed immortal, into a pear-shaped or lemon-shaped oval body, or become full of egg cysts. Nematodes are not sectioned, but are covered with a colorless, often streaked cuticle, with two layers beneath the stratum corneum, the lower cortex and the muscular layer. The mouth has a mastoid buccal cavity, which has one after another