Fire Amoeba in California Hot Springs Sets New Heat Survival Record

In the geothermal pools of Lassen Volcanic National Park, scientists searching for extremophiles stumbled upon a previously unknown amoeba. This organism was thriving in water so hot that it would be lethal to most living things. Early lab tests showed that this amoeba was not just surviving, but actively feeding and reproducing at temperatures far above what was thought possible for complex life.

The team named it Incendiamoeba cascadensis, meaning 'fire amoeba of the Cascade mountain range.' Its discovery immediately piqued the interest of researchers studying the boundaries of life on Earth.

On September 22, 2026, several scientific outlets reported the formal identification and study of Incendiamoeba cascadensis. According to Science Magazine, the amoeba's survival at extreme heat is due to a static protein shield that protects its cellular machinery.

New Scientist detailed how the amoeba was found reproducing at 63°C, a temperature previously considered impossible for complex organisms. Phys.org reported that this record surpassed all known heat tolerance for complex life, drawing attention from the broader scientific community.

Financial Times World and World News CNA highlighted the organism's addition to the 'extremophile' club, noting its significance in studies of life's resilience. Gizmodo Tech covered how the amoeba treats a 145-degree hot spring like a comfortable environment, surprising even seasoned researchers.

NASA Breaking News Space confirmed that the findings were part of a NASA-funded project, with lab tests showing the organism remaining partially active even at 150°F. This finding opens up new questions about how complex life could survive in even harsher environments, both on Earth and potentially elsewhere.

Incendiamoeba cascadensis is now recognized as the most heat-tolerant complex organism known to science. Its unique protein shield mechanism is under active study, with researchers eager to understand how it might be used to engineer heat-resistant proteins for industrial or medical use.

The discovery has also renewed interest in searching for life in other extreme environments, including on other planets or moons with geothermal activity.

Scientists are planning further experiments to map the genetic and biochemical basis for the amoeba's extraordinary heat resistance. There is also growing interest in whether similar extremophiles could exist in other geothermal regions, or even on other worlds.