Difference between Ancylostoma duodenale and Necator americanus
| Ancylostoma duodenale | Necator americanus |
| First identified in Italy | First identified in Texas, USA |
| Old world hookworm | New world hookworm |
| Larger (male 8-11mm) | Smaller (male 7-9mm) |
| Anterior end bent in same direction of general curvature of body | Anterior end bent in opposite direction of general curvature of body |
| Prominent buccal capsule with 2 pairs of teeth | Smaller buccal capsule with 2 pairs of semilunar cutting plates |
| Vulva opens at junction of middle and posterior 1/3 | Vulva opens a little in front of the middle |
| Copulatory spicules not fused | Copulatory spicules fused at ends to form a barbed tip |
| Lifespan 2-7years | Lifespan 4-20yrs |
| Ground itch less common | Ground itch more common |
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