120
mm 0.0 --:=
0.1 ~
=
0.2
~
=
OJ ::
Fig. 5. Cycles theria hisiopi. Development of diapause eggs. Two membranes can be recognized, a stronger inelastic outer membranae and a
rugous and thinner and very expansive inner embryonic cuticle. Hatching starts with the swelling of the inner membranae through water uptake
into the subcuticular space, causing the rupture of the outer membrane in the equatorial region (a-d). The embryo continues development for
several days within the continuously expanding embryonic cuticle (e-f) and undergoes at least two molts within the inner membranes. After
the last of these molts and still within the inflated membrane, filtration movements of the limbs begin (h); later the hatching process terminates
with the rupture of the inner membranae.
trast, modern cladocerans may produce diapause eggs,
enclosed in an ephippium created from only a specialized part of the carapace, for several generations or
they may again produce non-diapause eggs.
Development of the diapause eggs
The yolk-loaded diapause eggs may possibly start
embryonic development within the brood chamber of