. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. DEVELOPMENT IN MOSQUITO 155 dividing into daughter cells (Fig. 43T) from each of which slender spindle-shaped bodies project like the " stickers " on a chestnut burr (Fig. 43U). Ultimately the cells lose their identity and the entire capsule or cyst becomes crammed full to the bursting point with myriads of these spindle-shaped bodies which have now developed into spores (Fig. 43V). Such a capsule may contain over 10,000 spores, and there may be as many as 500 capsules on a single mosquito's s
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. DEVELOPMENT IN MOSQUITO 155 dividing into daughter cells (Fig. 43T) from each of which slender spindle-shaped bodies project like the " stickers " on a chestnut burr (Fig. 43U). Ultimately the cells lose their identity and the entire capsule or cyst becomes crammed full to the bursting point with myriads of these spindle-shaped bodies which have now developed into spores (Fig. 43V). Such a capsule may contain over 10,000 spores, and there may be as many as 500 capsules on a single mosquito's stomach (Fig. 46). About ^ to A 1 â J^i°- '^^- Cross sec- days or more, according to temperature, tion of stomach of after the infected blood was swallowed bv the ^""p''** showing . , â ' capsules (oocysts) of mosquito, the capsule becomes mature and subtertian malaria, bursts, releasing the spores into the body cavity Q^^^^f ^°- ^'^*''^ of the mosquito. From here the httle parasites make their way to the three-lobed salivary gland (Fig. 46, sal. gl.) lying in the fore part of the thorax and connecting with the sucking beak. They assemble in the cells lining the sahvary. â¬Â£/^^^B M- â¢^""^1^^^^^^ malp. '(ui>. ant-' ^Kj ^^^^t ^^ ids. 'soLgL Fig. 46. View of digestive tract of Anopheles, showing spore-filled capsules of malaria parasites on wall of stomach, pal., palpi; prob., proboscis; ant., antennae; ph., pharynx; oes., oesophagus; sal. gl., salivary glands; f. res., ventral food reservoir; d. f. res., dorsal food reservoirs; prov., proventriculus; St., stomach; malp. tub., malpighian tubules; int., intestine. X 10. glands (Fig. 43W) and remain there perhaps for weeks, until the mosquito bites. When this happens the parasites flow with the poisonous saliva into the puncture made by the mosquito and, should the prey of the mosquito be a human being, the whole. Please note that these images are extracted from scanned page images that may
Size: 1611px × 1550px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookdecade1910, bookpublishernewyorkjwiley
