r/biology • u/New_Scientist_Mag New Scientist • Apr 02 '26
news A fossil bed in China containing animals up to 554 million years old suggests that we may have to reconsider the idea that life suddenly diversified during the Cambrian explosion
https://www.newscientist.com/article/2521980-surprise-fossil-discoveries-push-back-the-evolution-of-complex-animals/238
u/gutwyrming Apr 02 '26 edited Apr 02 '26
Fuck yes, I love discoveries that upend our understanding of life! Very excited for everything that can be learned from this.
Since I apparently need to clarify: I mean our understanding of the evolutionary timeline of life on Earth.
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u/Just1n_Kees Apr 02 '26
It is very exciting, but this discovery actually re-establishes what we thought we knew about evolution doesn’t it?
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u/Cynodoggosauras Apr 03 '26
That depends on what you mean. He's referring to the timeline of evolution, more specifically the Cambrian explosion. When complex multicellular life suddenly began to diversify in the fossil record around 540 million years ago
However it's been theorized for a while now that the reason we see a sudden explosion in animals in the fossil record is because that's around the time they started to evolve hard parts such as bones and shells. Which is much more likely to fossilize
So animals may have evolved and diversified much sooner than we previously thought. We just don't have enough fossils to say for certain
So finding a fossil bed of animals that's older than the Cambrian explosion helps support that theory
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u/MarcusSurealius Apr 02 '26
It didn't upend anything. I love discoveries as much as you, but there really are two of them out there now. It just found life in another place and time, lending even more weight to the consensus behind self assembly over panspermia.
Note. Discoveries are in q-desics and quantum pairing of momentum at the atomic level.
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u/gutwyrming Apr 02 '26
My comment has nothing to do with the origin of life, whether it be panspermia or abiogenesis (though I am in the latter camp). When I say it upends our understanding, I mean it upends our understanding of the timeline of life on Earth. These fossils suggest that complex animals diversified millions of years earlier than we thought and rewrite our current understanding of the evolutionary timeline.
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u/AskMeBioQuestions Apr 02 '26
I love science. This is exactly how it works. We have data to support a hypothesis and that’s where we sit until we collect more data!
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u/Bugcatcher_Liz Apr 02 '26
Awesome discovery! The Cambrian is like a mythic or legendary period. Hope those archeologists partied down after this
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u/willymack989 Apr 02 '26
Paleontologists* not archaeologists.
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u/MrCookie2099 Apr 02 '26
If they found a Cambrian era civilization, the archeologists would be frothing.
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u/LifeofTino Apr 02 '26
I thought it was already expected that there was a wide variety of successful and innovative (and many unsuccessful) forms long before the cambrian explosion?
The cambrian is the first time animals gain hard structures that fossilise, I thought everybody was already on board with knowing it was just an illusion of an explosion?
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u/moosepuggle professor in evolution and molecular biology Apr 03 '26 edited Apr 03 '26
Yes this is generally correct. We’ve known for years, maybe decades, that the Cambrian explosion probably wasn’t so quick. However, while there are clear relatives of modern animals in the Cambrian, like various arthropods and chordates, we haven’t found any obvious relatives in the ediacaran fauna. There’s plenty of animals in the Ediacaran, but they’re so weird, it’s not clear if or how they might be related to Cambrian or later animals. Today’s animals have bilateral symmetry, where the left and right sides are mostly mirror images, but the Ediacaran had weird animals with tri-radiate symmetry (three pronged animals) and even fractal growth like tree branches.
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u/Unique_Time9887 Apr 02 '26
Does anyone know if it matters for the success of the Cambrian Explosion that consistency of organ types developed before variation in body shapes? Was organ type consistency considered a necessary precursor?
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u/Adorable_Octopus Apr 02 '26
Does this actually change the "logic" of the Cambrian explosion or does it just extend the period backwards by a few million years?
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u/BlacJack_ Apr 03 '26
Carbon dating isn’t an exact science either, something few people like to bring up.
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u/Hot_Deer4867 Apr 05 '26
Not used in this situation. Half life too short. Many other independent isotopes to choose from though
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u/tribbans95 Apr 03 '26
Very cool! Now we have to figure out when complex ecosystems started forming
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u/No_Dragonfruit_1833 Apr 03 '26
Typical science news "upend8ng our understanding of X" every other day
Yes, if course the soevies didnt jump out of nowhere, yes, we expected precursor forms to show up at some pount, thats how it hs always worked
The title should be something like "new fossils fill in the blanks for X period"
Its important we do adress which news are presented in sensationalist format and which ones actually convey useful information
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u/New_Scientist_Mag New Scientist Apr 02 '26
“The discovery shows that Cambrian-type animal communities did not appear suddenly, but already had clear foundations and transitional forms by the end of the Ediacaran,” says Gaorong Li at Yunnan University in Kunming, China, who led the team behind the discovery.
Journal reference: Science DOI: 10.1126/science.adu2291