Yes. Researchers observed Incendiamoeba cascadensis, nicknamed the fire amoeba, reproducing by cell division at 63°C. It is a single-celled eukaryote, meaning its cell contains a nucleus.
The researchers' publicly accessible preprint abstract reports growth experiments and microscopy showing division at 63°C. Syracuse University's September 22, 2026 account of the study describes the same result. The central finding was already public in a November 2025 preprint; the recent coverage does not date the original observation.
Reproduction and survival are different measurements. NASA reports recovery after five minutes at 70°C, while Syracuse describes a dormant protective state at that temperature. Neither establishes reproduction at 70°C, and the organism's abilities should not be generalized to all eukaryotes.
The reported reproduction temperature is 63°C. Surviving a brief, hotter exposure does not mean the amoeba can reproduce there.
H. Beryl Rappaport and colleagues
The preprint abstract reports cellular proliferation in growth experiments and microscopy of mitosis. The accessible figure legends also describe replication at temperatures up to 63°C.
Based on: bioRxiv via PubMed
Syracuse University
The university states that cultured amoebae continued dividing at 63°C. This account describes the same research and is not an independent replication.
Based on: Syracuse University
NASA
NASA describes recovery following five minutes of exposure to 70°C. That observation concerns survival and recovery rather than cell division at that temperature.
Based on: NASA
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