. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. Fig. 86. Types of tapeworm larvae: A, cysticercus of Taenia solium with head and neck evaginated, X 3; B, cysticeiooid of Hymenolepis nana, X 12; C, plerocer- coid of Dibothriocephalus latus, with head invaginated. (A, partly after Stiles, B, from several figs, by Grassi and Rovelli; C, partly after Braun.) worm is poorly developed; (3) the coenurus, in which multiple heads form in the single bladder; and (4) the hydatid, in which the bladder buds into multiple daughter cysts, each with multiple heads (
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. Fig. 86. Types of tapeworm larvae: A, cysticercus of Taenia solium with head and neck evaginated, X 3; B, cysticeiooid of Hymenolepis nana, X 12; C, plerocer- coid of Dibothriocephalus latus, with head invaginated. (A, partly after Stiles, B, from several figs, by Grassi and Rovelli; C, partly after Braun.) worm is poorly developed; (3) the coenurus, in which multiple heads form in the single bladder; and (4) the hydatid, in which the bladder buds into multiple daughter cysts, each with multiple heads (Fig. 95). The larvse of the tapeworms of the family Dibothriocephalidce are quite unlike the bladderworms of other tapeworms. They grow as long wrinkled wormlike bodies with the head invaginated in a little projection at the anterior end. Such a larva is called a plerocercoid (Fig. 86C). When the organs or tissues in which the larval stages are developed are eaten by an animal of the kind from which the eggs originally came, all but the scolex of the bladderworm is digested off, the latter turns right side out, attaches itself to the wall of the small intestine with the aid of its suckers and hooks, and be- gins to bud off proglottids of another generation. Tapeworms are usually looked upon as inert animals, but in reality they are quite active, and their movements can often be 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 Chandler, Asa Crawford, 1891-. New York, J. Wiley
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