The three embryonic instars are well separated by the embryo size (see growth curve in Fig. 5). The length of
the egg in the first h of the development is about 0.17 mm.The length almost does not change during each of the I,
II, III, and IV embryonic instars, yet increases stepwise with molting events that occur at 9 h (between instars I
and II-III), and at 20 h (between instars II-III and IV), and by the end of development shortly after release from the
brood pouch (between embryonic instar IV and postembryonic instar I), from about 0.23 to about 0.33 mm, i.e.
an increase of about 1.4 times.