The histochemistry and fine structure of the embryophore of Shipleya inermis (Cestoda)

The embryophore (inner capsule) of the tapeworm Shipleya inermis was studied with histochemistry and electron microscopy. It was found to be unique for the cestodes in that it has a laminated construction. During development lamina are added until there are 10 which are arranged in an irregular zig-zag pattern. The embryophore is positive to tests for acid and alkaline phosphatase, and the Hales test for acid mucopolysaccharides. Permeability of tapeworm egg coverings is discussed.