1、Experiment The Morphological Features of the Parasites in Cattle and Goats 华南农业大学兽医学院牛羊常见寄生虫的形态特征1. Haemonchus contortus（ 捻转血矛线虫） The male has an asymmetrical dorsal lobe . The female usually has a vulval flap. 雄虫交合伞有一 “人 ”字形背肋 雌虫有一发达的椭圆形阴门盖。2. Oesophagostomum （ 食道口线虫） 1. Oe. radiatum has two inflat
2、ed collars. 辐射食道口线虫头囊分成两部。 2. Oe. columbianum has a pair of broad cervical alae. 哥伦比亚食道口线虫有发达的颈侧翼和 1对颈乳突。 3. Oe. venulosum without above features. 微管 食道口线虫无上述特征。 4. Oe. asperum has an inflated cuticular cephalic vesicle. 粗纹食道口线虫头囊发达。3. Toxocara (syn. Neoascaris) vitulorum （犊弓首蛔虫） T. vitulorum is the
3、 largest intestinal parasite of cattle . The egg is subglobular, with a thick pitted shell. 犊弓首蛔虫为牛体内最大型线虫； 虫卵近圆形，具凹凸不平的厚卵壳。4. Bunostomum spp. （仰口线虫）Site: small intestine5. Fasciola hepatica （ 肝片吸虫） The anterior end is conical and marked off by distinct shoulders from the body. The egg is oval, oper
4、culate, yellow and large . 成虫体前端具头锥和肩部； 虫卵椭圆形，淡黄色，一端有卵盖。 The ovary, testes and caeca much-branched. 肝片吸虫的卵巢、睾丸和肠管都高度分枝。Oral Sucker（ 口吸盘）Ventral Sucker（ 腹吸盘）Testis（ 睾丸 ）Ovary（ 卵巢 ）intestine（ 肠管）肝片吸虫 姜片吸虫6. Paramphistomum （ 前后盘吸虫） The adults are small, conical, maggot-like flukes One sucker is at the tip ， and the other at the base . 虫体呈圆锥状；一吸盘在体前端，另一吸盘在体后端。前后盘吸 虫卵 椭圆形； 无色或灰褐色； 一端有盖； 卵内结构较疏松。 注意与肝片吸虫卵比较肝片吸虫卵7. Schistosoma japonicum（ 日体分体吸虫 ） The body is thread form， Unisexual, not hermaphrodite. 虫体呈圆线状；雌雄异体；雄虫具一抱雌沟 。
