According to Leiper, Œs. brumpti is identical with, and hence a synonym of, this species. Parasitic in large intestines of monkeys, producing dysentery, and in man (Northern Nigeria).
According to Walker this species is common in Philippine monkeys. Ova are scanty in the fæces. They measure 73 µ to 84 µ by 44 µ to 57 µ and are in the morula stage. They are easily cultivated. The rhabditiform larva is 340 µ by 16 µ and has a long filiform tail. It moults twice, and at the second moult becomes a filariform larva retaining the skin of this moult, this stage being that of the mature larva. It now measures 9 mm. long by 30 µ thick. Walker suggests that the mode of infection is similar to that of ancylostomes.
Group. Ancylostomeæ, Railliet and Henry, 1909.
Bursa with anterior ray cleft, median double,[314] postero- and postero-external arising from a common trunk, posterior bifurcate, each limb being tridigitate. Vulva in posterior third of body. Uteri divergent.
Contains the following genera: (1) Strongylus,[315] (2) Ancylostoma, (3) Uncinaria, (4) Characostomum, etc.
Genus. Ancylostoma, Dubini, 1843, emend. Looss, 1905.
Ventral margin of mouth capsule armed with teeth, the “roots” of which are continued backwards and appear on the external surface of capsule as rib-like thickenings. Terminal third of dorsal ray cleft. Genital tubes very long, with short, closely packed diagonal convolutions.
Ancylostoma duodenale, Dubini, 1843.