Studies of parajulid diplopods. I. The development of the external sexual structures of Parajulus impressus say(8)

Abstract

FOUR PLATES (TWENTY-FIVE FIGUKES) AUTHOE'S ABSTRACTA description of the gross embryology of the sex apparatus of a common diplopod, the corn millipede. The life-cycle of this animal involves eleven instars extending over a perlod of three years.I n the male the true first legs are shed a t the ninth ecdysis and the large clasping appendages are substituted through the last three instars. I n the region of the second body somite the fused coxal plate and the penes are developed at the final molt: the second appendages are reduced at this time. The greatest changes occur in the region of the seventh somite where the legs are shed about the eighth ecdysis and the gonopods developed through the rimaining instars. It is evident that these gonopods arise as a modification of the sternites of the seventh somite. The structures at the mouth of the oviducts are developed from the surrounding tissues and the modifled sternites of the reduced second legs. These changes are in progress as early as the seventh instar, but the greatest changes occur a t the final ecdysis.