1、09级第 2讲蛔虫、钩虫、鞭虫Roundworm, hookworm and whipworm似蚓蛔线虫似蚓蛔线虫 (Ascaris lumbricoides)毛首鞭形线虫毛首鞭形线虫 （ Trichuris trichiura）十二指肠钩口线虫十二指肠钩口线虫 （ Ancylostoma duodenale） 美洲板口线虫美洲板口线虫 （ Necator americanus） 似蚓蛔虫（蛔虫）似蚓蛔虫（蛔虫）Ascaris lumbricoides（roundworm)一、形态一、形态 MorphologyP16220-35cmAdult15-31cmearthworm FemaleLon
2、g :20 35cm，尾端钝圆生殖器官为双管形 MaleLong:15 31cm,尾端向腹面弯曲生殖器官为单管形，末端有一对镰状交合刺Fertilized eggUnfertilized egg: 脱蛋白质脱蛋白质膜受精卵膜受精卵Egg蛋白质膜卵壳卵细胞新月形间隙卵黄颗粒protein membraneeggshellUnfertilized eggs are elongated and larger (up to 90 m in length); their shell is thinner; and their mammilated layer is more variable, either with large protuberances or practically none; these eggs contain mainly a mass of refractile granules.
