Proteus anguinus embryonic expansion usually takes 140 days and it may take another 14 years in order to arrive at complete sexual maturity. The larvae obtain grown-up form after approximately four months, with the period of complete maturity robustly relating with water temperature. Unverified chronological examinations of vivipary do subsist, but it has been illustrated that females have a peculiar gland that creates the egg covering, comparable to those of fish and egg-hatching amphibians.
Proteus Anguinus