一种异常的捻转血矛线虫

Abnormal Structure in Haemonchus contortus

从自然感染羊上采集的捻转血矛线虫 ,发现部分虫体头部有明显的头翼膜样结构或类似的痕迹 ,此种结构过去未有记载。分别取正常和异常雌虫虫卵进行培养 ,观察幼虫发育过程并比较幼虫形态变化。发现正常和异常虫体第三期幼虫 (L3 )的虫体长度和食道长度差异极显著 。

Some specimens of Haemonchus contortus collected from naturally infected goats had a structure similar to cephalic ala on the head which had not been described before. We cultured the eggs from abnormal and normal female adults separately, observed the developmental processes of their larvae and compared the shape variation of these larvae, especially the third stage infective larvae. The results show that there are distinguishing differences in the length of L 3 larvae and their oesophagus but no difference in width of L 3 larvae or length of the tail sheath between these abnormal and normal third stage juvenile larvae.