Tardigrada

Tardigrades, also known as water bears or moss piglets, are water-dwelling, eight-legged, segmented micro-animals. Tardigrades are notable for being perhaps the most durable of known organisms: 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 (−458 °F; −272 °C) to about 420 K (300 °F; 150 °C), 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. For more information, visit the Wikipedia entry Go back to Animalia
Echiniscus japonicus	Echiniscus sp.	Hypsibius dujardini	Macrobiotus sapiens