Science

One ancient swimming mammal fossil and two evolutionary surprises, including a third set of teeth

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 08/10/2026, 17:10:24 UTC.

Briefings

A 2026 article reports the discovery of Dongoconodon platycauda, a semiaquatic mammal from northeastern China dating to approximately 120 million years ago. This fossil exhibits webbed paddling feet and a rudderlike tail, resembling a cross between a platypus and a beaverlike rodent. A key finding is the presence of a third set of teeth, representing a new evolutionary stage in the jaw structure. The study provides initial insights into the evolutionary history of early mammals but acknowledges significant gaps in the fossil record.

Key points

• Dongoconodon platycauda is a semiaquatic mammal from northeastern China dated to approximately 120 million years ago.
• The fossil possesses webbed paddling feet and a rudderlike tail, suggesting a specialized aquatic lifestyle.

Context and limitations

The fossil record for this period is incomplete, limiting the ability to trace evolutionary patterns with high certainty. Further fossil discoveries are required to fully understand the jaw structure and evolutionary significance of the third set of teeth.

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