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Extreme Fire Amoeba Shatters Heat Tolerance Record in Lassen Volcanic Park

A newly identified single-celled organism named Incendiamoeba cascadensis, meaning fire amoeba from the Cascades, was discovered in hot springs at Lassen Volcanic National Park in California between 2023 and 2025 by researchers including H. Beryl Rappaport and Angela Oliverio.

A newly identified single-celled organism named Incendiamoeba cascadensis, meaning fire amoeba from the Cascades, was discovered in hot springs at Lassen Volcanic National Park in California between 2023 and 2025 by researchers including H. Beryl Rappaport and Angela Oliverio.

The organism can grow and divide at temperatures up to 63 degrees Celsius or 145 degrees Fahrenheit, establishing a new record for the upper temperature limit across all eukaryotic lifeforms and surpassing the previous record of 57 degrees Celsius held by other amoebae.

The organism can grow and divide at temperatures up to 63 degrees Celsius or 145 degrees Fahrenheit, establishing a new record for the upper temperature limit across all eukaryotic lifeforms and surpassing the previous record of 57 degrees Celsius held by other amoebae.

Incendiamoeba cascadensis is classified as an obligate thermophile because it requires temperatures of at least 42 degrees Celsius to begin growth, with optimal growth occurring between 55 and 57 degrees Celsius, and it does not grow below 42 degrees Celsius in laboratory conditions.

Incendiamoeba cascadensis is classified as an obligate thermophile because it requires temperatures of at least 42 degrees Celsius to begin growth, with optimal growth occurring between 55 and 57 degrees Celsius, and it does not grow below 42 degrees Celsius in laboratory conditions.

The amoeba remained active and motile at 64 degrees Celsius and formed protective cysts at 66 degrees Celsius to survive extreme conditions. It also formed cysts at 25 degrees Celsius, stopped moving at 70 degrees Celsius but could revive when cooled, and only ceased activity at 80 degrees.

The amoeba remained active and motile at 64 degrees Celsius and formed protective cysts at 66 degrees Celsius to survive extreme conditions. It also formed cysts at 25 degrees Celsius, stopped moving at 70 degrees Celsius but could revive when cooled, and only ceased activity at 80 degrees.

Genomic analysis revealed that Incendiamoeba cascadensis has evolved adaptations including expanded families of heat-resistant proteins, heat-shock chaperones, rapid signaling pathways and enhanced heat-response mechanisms that enable it to maintain cellular integrity at high temperatures.

Genomic analysis revealed that Incendiamoeba cascadensis has evolved adaptations including expanded families of heat-resistant proteins, heat-shock chaperones, rapid signaling pathways and enhanced heat-response mechanisms that enable it to maintain cellular integrity at high temperatures.

Similar DNA sequences to Incendiamoeba cascadensis were detected in environmental samples from Yellowstone National Park and New Zealand's Taupo Volcanic Zone, suggesting that related thermophilic organisms may be more widespread in geothermal systems around the world.

Similar DNA sequences to Incendiamoeba cascadensis were detected in environmental samples from Yellowstone National Park and New Zealand's Taupo Volcanic Zone, suggesting that related thermophilic organisms may be more widespread in geothermal systems around the world.

Fire Amoeba Sets Record Surviving 145°F Hot Springs

TinyFire Volcano-DwellingAmoeba CreatureSets BreaksRecord HeatSurviving Record145°F Hot Springs

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Fire Amoeba Sets Record Surviving 145°F Hot Springs

TinyFire Volcano-DwellingAmoeba CreatureSets BreaksRecord HeatSurviving Record145°F Hot Springs

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