Changes in the Size of Egg-form Embryos with the Advance of Development in the Salamander Hynobius nigrescens

Abstract

Using the eggs derived from 16 females of Hynobius nigrescens, changes in the size of developing egg-form embryos (from 2-cell embryo to gastrula) were studied. No significant difference in the proportional increase in size was found among the embryos of any of the females examined. Conversion factors for obtaining the initial egg size from the size of egg-form embryos were presented.