Climate

World Octopus Day: new discoveries about the world’s smartest invertebrates

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 08/10/2026, 23:09:24 UTC.

Briefings

Mongabay reported on ancient octopus fossils described in April 2026 by Japanese researchers, suggesting the extinct Nanaimoteuthis haggarti could have reached 6.6 to 18.6 meters in length, potentially making it one of the largest invertebrates ever known. The article also covered recent findings on baby Argentine octopuses and a rare photo of their eggs in Puerto Lobos, highlighting ongoing research into octopus diversity and life stages.

Key points

• Japanese researchers described an extinct ancient octopus fossil in April 2026, suggesting the species Nanaimoteuthis haggarti may have reached 6.6 to 18.6 meters in length.
• The fossilized jawbone indicates the octopus could have been among the largest invertebrates ever known, comparable in size to a blue whale.

Context and limitations

Fossil size estimates are based on jaw dimensions and expert interpretation; specific habitat details and exact extinction timing remain uncertain.

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