A fossil previously believed to be the oldest known octopus has been reclassified as a decomposed nautiloid after advanced imaging analysis. The misidentification persisted for 25 years due to the fossil's poor preservation as a flat stain in iron-rich rock. This correction aligns cephalopod evolution timelines with existing Jurassic-era divergence evidence.
Background
Cephalopod evolution has been poorly documented in the fossil record due to the soft-bodied nature of octopuses and squid. The Mazon Creek fossil site in Illinois is known for exceptional preservation of Carboniferous-era organisms in iron-rich nodules.
- Source
- Ars Technica
- Published
- Apr 11, 2026 at 12:54 AM
- Score
- 5.0 / 10