 In order to face up these kinds of difficulties, the Chirocephalus produce a form of resistance called cyst, inside of which the embryo is stopped at the stage of gastrulation, is isolated by a protective partition which allows it to keep its vitality until the moment when the ideal conditions for its development recreate themselves until the hatching.The cysts are left season after season and do not all hatch out, a part stays in the sediment which constitutes de facto a stock and an extra guarantee for the species survival.The protection of the biotope is primordial because the life of the species under its adult form only goes for several months, whereas the cysts which are produced stay vital for many years if the anthropic factors do not disrupt the sediments where they build up.