Necator americanus (continued)
OVA
Same as A. duodenale
Figure 4-16. Stages of Necator americanus. Continued)
ADULT
SIZE: Smaller than A. duodenale.
Male: 5 to 9 mm.
FEMALE: 9 to 11 mm.
SHAPE: Cylindrical; head is sharply dorsally curved.
COLOR: Grayish-white.
BUCCAL STRUCTURES: Prominent ventral and dorsal semilunar cutting plates.
COPULATORY BURSA: Male.
PAIRED COPULATORY SPICULES: Fused with a terminal barb.
SMALL PAIRED DORSAL RAYS: Bipartite.
MD0842
4-21
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