Scanning electron microscopic observations on the embryogenesis in the wild silkmoth, Antheraea yamamai

Abstract

The embryo of Antheraea yamamai developed so rapidly compaired with Bombyx mori and Antheraea pernyi. Scanning electron microscopy of developing A. yamamai embryo revealed the ultrastructural changes of each stage, especially from 12hr post-oviposition to 240hr. The morphogenesis of the embryo also showed that at approximately 12hr post-oviposition the protocephalic and caudal lobes began to form. By 36hr, many of the appendages became visible form, and investigation of the proctodeum was initiated. Between 60 and 72hr, the embryo began to shorten and blastokinesis and dorsal closure took place. Between 96 and 108hr, the head and thorax became clear. By 240hr, all of the first instar larval features were present.