used two
glass plates separated by foam rubber to rear
proturans for nearly 100 days, providing significant
information on proturan biology. However, in spite
of a number of trials, we have not yet succeeded in
maintaining proturans long enough to obtain eggs
or individuals of the next generation. Aiming at
collecting proturan eggs under rearing conditions
for embryological study, we have improved techniques,
and successfully developed a new method for
maintaining proturans for over a year.