In the 4th stage larvae, the length of mouth cavity of A. duodenale is almost equivalent to its width, but that of N. americanus is shorter.
十二指肠钩虫第4期幼虫口腔的长宽几乎相等，但美洲钩虫宽大于长。
In the 4th stage larvae, the length of mouth cavity of A. duodenale is almost equivalent to its width, but that of N. americanus is shorter.
十二指肠钩虫第4期幼虫口腔的长宽几乎相等，但美洲钩虫宽大于长。
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