. Animal biology. Zoology; Biology. 176 METAZOAN PHYLA 203. Life History of a Tapeworm.—The life history of a cestode (Fig. 87) also involves two hosts, the final host becoming infected with the parasite through eating the intermediate host. A typical life history is that of the beef tapeworm, Taenia saginata (Goeze), the adult of which is found in the human intestine, and which passes through the following steps in its life history:. Fig. 87.—Diagram showing the life history of Taenia saginata. A, the adult tapeworm (reduced), from intestine of man. B, the egg (much enlarged), containing six-
. Animal biology. Zoology; Biology. 176 METAZOAN PHYLA 203. Life History of a Tapeworm.—The life history of a cestode (Fig. 87) also involves two hosts, the final host becoming infected with the parasite through eating the intermediate host. A typical life history is that of the beef tapeworm, Taenia saginata (Goeze), the adult of which is found in the human intestine, and which passes through the following steps in its life history:. Fig. 87.—Diagram showing the life history of Taenia saginata. A, the adult tapeworm (reduced), from intestine of man. B, the egg (much enlarged), containing six-hooked embryo. Such eggs pass out of the host in the feces and do not hatch until eaten by cattle. C, young larva (cysticercus) from muscles of infected cow. D, later stage in the development of the cysticercus. E, cysticerci (about natural si2e) embedded in beef. F, diagram of cysticercus (enlarged) showing invaginated scolex. G, cysticercus showing evaginated scolex and early proglottids. {B, C, D, G from Leuckart. " Parasiten des Men- schen"; F, from Faust, "Human Helminthology," figures arranged by H. W. Manter.) 1. The egg cell is produced in the ovary, passed into the oviduct, fertilized, supplied with yolk, inclosed in a shell, and carried to the uterus. In the uterus there develops in this egg a six-hooked embryo. As the proglottid becomes ripe and passes out of the body of the host with the feces, it carries with it thousands of embryos, still inclosed in the egg Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wolcott, Robert Henry, 1868-1934; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
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