In the present study, the reproduction potential and survival capability of the soil nematode Pristionchus maupasi was followed in 10 cm 2 Petri dishes at different constant temperatures: 5, 10, 15, 20, 25 and 30 o C. The experiment started by placing nematode eggs on each dish. The minimum number of days from eggs, at start, to adult egg producing nematodes, decreased from 7 days at 10 o C to 3 days at 25 o C. At 5 o C no eggs hatched, and at 30 o C the released larvae did not develop into egg producing adults. After 7 days all eggs had hatched in the interval between 15 and 30 o C and 87 % at 10 o C. From hatched eggs the 1 st generation nematodes evolved. At day 4, the number of 1 st generation nematodes was almost similar at temperatures ranging from 10 to 25 o C, while the number at 30 o C was significantly lower. The 1 st generation adult nematodes gave rise to a 2 nd generation, which did not develop to fertility, but became arrested 3 rd stage "dauerlarvae", maybe due to reduced food supplies and increased concentration of wastes. From 100 'eggs at start', 10000 to 14000 2 nd generations "dauerlarvae" developed at temperatures between 10 and 20 o C. In the interval from 10 to 25 o C, a substantial number of these survived more than 2 months.