|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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