Tardigrade are not mesophilic.
A mesophile is an organism that grows best in moderate temperature , neither too hot nor too cold , typically between 20 & . Tardigrades ( [ ˈtɑrdᵻˌgreɪd ] also known as water bears , space bears , or moss piglets ) are water-dwelling , eight-legged , segmented micro-animals . Tardigrades are one of the most resilient animals known : they can survive extreme conditions that would be rapidly fatal to nearly all other known life forms . They can withstand temperature ranges from 1 K ( close to absolute zero ) to about 420 K for several minutes , pressures about six times greater than those found in the deepest ocean trenches , ionizing radiation at doses hundreds of times higher than the lethal dose for a human , and the vacuum of outer space .