Most live for less than a year, but some species such as Dolabella auricularia have been reported to survive as long as six years in captivity. The Antarctic cephalaspidean Philine gibba lives more than four years in its natural habitat. Many small species of opisthobranchs can complete their life cycle within weeks; so is the case of Tenellia pallida, an aeolid found in temperate waters which reaches maturity in about 21 days.