. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. CHAPTER XIII THE TAPEWORMS General Structure. â Even more peculiar and remarkable in their structure and life than the flukes are the tapeworms. A mature tape- worm is not an individual, but ,a whole family, consisting sometimes of many hundreds of individuals one behind the other like the links of a chain (Fig. 81). In some respects the tapeworms are more degener- ate than flukes, due to their in- variably parasitic life in the digestive tract of their hosts. Being continu- ally bathed in semi-digested
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. CHAPTER XIII THE TAPEWORMS General Structure. â Even more peculiar and remarkable in their structure and life than the flukes are the tapeworms. A mature tape- worm is not an individual, but ,a whole family, consisting sometimes of many hundreds of individuals one behind the other like the links of a chain (Fig. 81). In some respects the tapeworms are more degener- ate than flukes, due to their in- variably parasitic life in the digestive tract of their hosts. Being continu- ally bathed in semi-digested fluids in the intestine they can readily absorb food all over the surface of their bodies, and have no need for a digestive system of their own. The digestive tract, therefore, is entirely lacking, not even a vestige of it remaining as an heirloom from less dependent ancestors. In general form the majority of tapeworms are very long tapehke organisms which attach themselves to their host's intestinal walls by a " head " or scolex at what is really the posterior end of the chain of segments. This scolex is furnished with '?i7pkpr'5 nnd often hook«! aq well ««»»»«<«â X t- Note small head, Wltn SUCKerS ana Olten noOKS as wen gradual change in size of proglot- (Fig. 82). -Next to the head there tids, and irregular alternation of is a narrow region or " neck" which continually grows and forms segments as it grows, each new segment thus produced pushing forward the segments previous^ formed. This process eventu- 231. Fig. 81. Beet tapeworm, Taenia sides of genital apertures. StUes.) (After. 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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