Cultures of a bacterial species were incubated on the shelf…

Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37° C incubator, on the shelf of a 50° C incubator, and in a 75° C incubator. After incubation, there was no growth in the culture in the frig, slight growth out on the bench top, thick growth at 37° C, slight growth at 50° C and no growth at 75° C . What term could be used for this species?