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news Biology Evidence status: Peer reviewed · Fossil description plus bone chemistry

Armoured Triassic amphibian may be the first known to live fully at sea

Two 237-million-year-old skeletons from China may show the first fully marine amphibian. What the fossils and strontium test show, and the caveat that remains.

What it does not show Strontium values cannot alone exclude growth near one land source, and fossil bone can be altered during burial

By Murad Ali Khan 10 min read
Primary sourcesResearch and official data linked in context
Evidence calibratedObservation, interpretation and speculation separated
Corrections welcomeTransparent updates and a direct reporting channel

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More from SciQuest

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Diagram placing lab-grown Asgard archaea strains HC1 and SC1 beside eukaryotes on the family tree, and comparing a simple HC1 cell with protrusions to a eukaryotic cell with nucleus and mitochondria

news Biology Evidence status: Peer reviewed · Laboratory cultures and genome analysis

Lab-grown Asgard archaea closest to eukaryotes are simple inside

Two newly cultured Heimdallarchaeia, the closest known archaeal relatives of eukaryotes, lack internal membranes. What that means for how complex cells began.

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    Find the primary evidence

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  2. 02
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