Fig. 333.—Ancylostoma braziliense: bursa of male. (After Gomez de Faria.)
Group. Bunostomeæ, Railliet and Henry, 1909.
Bursa with median double, postero- and postero-external arising from a common trunk, posterior bifurcated, each limb bidigitate (fig. [336]). Vulva in middle of body or a little in front. Uteri divergent.
Contains the following genera: (1) Bunostomum (= Monodontus); (2) Necator; (3) Bathmostomum; (4) Gaigeria.
Genus. Necator, Stiles, 1903.
Mouth capsule small, narrowed anteriorly (ventrally) by chitinous plates, as in Uncinaria. On each side of the base of the dorsal cone a lateral chitinous plate or lancet with smooth edge (not serrated), ventral lancets as in Ancylostoma. No ridges on outside of ventral wall. Aperture of dorsal œsophageal gland on tip of a cone projecting freely into the buccal capsule. Bursa closed. Posterior ray cleft to its root.
Necator americanus, Stiles, 1902.
Syn.: N. africanus, Harrison, 1910.