Pohlsepia mazonensis

Concept

300-million-year-old fossil previously classified as the oldest octopus, reclassified as a nautiloid in 2026

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Study Describes 100-Million-Year-Old Giant Octopus That Preyed Alongside Dinosaurs

Fossil Study Identifies 100-Million-Year-Old Giant Octopus That Hunted Alongside Dinosaurs

Fossil Evidence Suggests Giant Octopuses Dominated Oceans 100 Million Years Ago