Development of Male Sex Cells in the Swallowtail, Papilio xuthus L. (Lepidoptera : Papilionidae in Relation to Pupal Diapause)

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Abstract
Testicular development and spermatogenesis were studied in P. xuthus larvae and pupae of both diapause and non-diapause types. Differentiation of the sex cells was observed during 4th and 5th (final) instar larvae, and eupyrene sperm bundles were 1st observed on the 1st day of the 5th instar in both types. In the diapause type the spherical spermatids began to degenerate at this stage, and on the 4th day of the 5th instar the spermatogenesis stopped completely; degeneration occurred in all the spermatidal cysts and sperm bundles at pupal stage. In the non-diapause type spermatogenesis continued through 5th instar, and apyrene sperm bundles appeared in pupae.