Abstract
The changes that take place in the different organs and tissues during the development of the hypopus result in the hypopus stage enclosing the partly developed organs and tissues of the succeeding deutonymph stage. The form of the hypopus stage depends on the degree of development of the epidermis in the hypopus direction. It varies from the cyst-like form of G. domesticus to the mobile form of H. polypori, which is utterly unlike the other stages of the life cycle. The cyst-like forms resemble the diapause condition in insects in that they can be terminated by exposure to low temperatures. The mobile form can be initiated and terminated by altering the humidity level of the environment. It is suggested that the potential for hypopus development resides in the epidermis which, in the case of the mobile hypopus, is sensitive to the humidity changes that control hypopus development.
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