关键词: 十二指肠钩虫；美洲钩虫；感染性幼虫；形态特征

Abstract: The morphological differentiation of the infective larvae between human Ancylostoma duodenale and Necator americanus is of great significance for the epidemiological survey of hookworm diseases and human parasitology teaching. Understanding of features of the oral spear and transverse lines on the tunica vaginalis is able to accurately differentiate the infective larvae between these two human hookworms.

Key words: Ancylostoma duodenale； Necator americanus； Infective larva； Morphological feature