Lifespan, longevity, and ageing
Maximum longevity: 0.16 years (captivity) Observations: These animals are free-living nematodes usually found in the soil of temperate environments. Temperature influences the lifespan of the roundworm with higher temperatures shortening lifespan and lower temperatures extending lifespan, at least until a certain threshold (Klass 1977). Several genetic manipulations have succeeded in extending the longevity of the roundworm, but many of these take into account the dauer stage, which involves a developmental arrest (Klass and Hirsh 1976). As such, the maximum longevity is a conservative estimate. Although physiological ageing has been described in roundworms, the cause of death of old animals remains a mystery.