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An Amber Is ‘Tomb’ To A Rare Tardigrade Fossil That’s Millions Of Years Old

By Mikelle Leow, 06 Oct 2021

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An artistic interpretation of microscopic tardigrades in their most common hiding spot: moss. Image via Mapalo et al / The Royal Society (CC BY 4.0)

Tardigrades have lived far longer than humans, even being there when the dinosaur population was wiped out. In spite of their well-traveled history, surprisingly little is known about their lineage.

That’s because there haven’t been many tardigrade fossils found. The discovery of this fascinating creature—hidden in plain sight—only makes the third. The rarity of this find seems even more impressive when you learn that these “water bears” have lived on Earth for over 500 million years.


Image via Mapalo et al / The Royal Society (CC BY 4.0)

In a new paper published by international scientists in the Proceedings of the Royal Society B journal, the team describes a tardigrade fossil that had been residing unnoticed in a chunk of 16-million-year-old Dominican amber. It’s been classified under the Paradoryphoribius chronocaribbeus species, a relative of the surviving tardigrades of today (the Isohypsibioidea family), CNN reports.

Tardigrades being the smallest legged animals on Earth, measuring under one millimeter, the scientists hadn’t even noticed the fossil. “It’s a faint speck,” noted Phil Barden, assistant professor of biology at New Jersey Institute of Technology and one of the study’s authors.

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Luckily, the fossil was so well preserved that the team could distinguish the water bear’s brain and central nervous system, eight tiny legs with even tinier claws, and pharynx.

“The discovery of a fossil tardigrade is truly a once-in-a-generation event,” declared Barden.

Thanks to the find, scientists might soon uncover more about the evolution of tardigrades from the past millions of years. There might even be physical features in this fossil that no longer belong to modern tardigrades.


The microscopic tardigrade’s itty-bitty claws. Image via Mapalo et al / The Royal Society (CC BY 4.0)



[via CNN, images via Mapalo et al / The Royal Society (CC BY 4.0)]
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