Spermatogenesis and Testicular Development of the European Corn Borer, Ostrinia nubilalis (Lepidoptera: Pyraustidae)1

Abstract

Quantitative data on the cellular components and size of the testis at various developmental stages of the European corn borer are presented. Percentages of the testicular components in 6 developmental stages of germ cells arc given, including spermatogonia, primary and secondary spermatocytes, spermatids, elongating and mature sperm. Testis size increased rapidly during larval and early pupal life, becoming reduced thereafter coincident with the migration of sperm into the efferent duct.