Abstract
This chapter discusses the advances in knowledge made in some aspects of the biology of post-embryonic stages of cestodes in the past 15 years. It summarizes the information on development and structure, emphasizing overall similarities (or differences) among the major groups of cestodes, and indicating some areas in which further research is deemed essential or profitable. Some of the factors, which form the basis of the physiological host specificity or susceptibility are suggested in this chapter. These include (1) enzyme concentration in the host intestine, which determines the hatching of the oncosphere; (2) intestinal emptying time in relation to time required for the hatching and establishment of the oncosphere; (3) the thickness or consistency of the host intestinal wall to be penetrated by the embryo, and (4) the environment of the host's body cavity which may permit or inhibit continued growth after the initiation of post-embryonic development.
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