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Fossil analysis reveals that lampreys are not swimming time capsules

Fossil analysis reveals that lampreys are not swimming time capsules
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South africaUnited statesUniversity of chicagoTetsuto miyashitaMichael coatesUniversity of chicago medical centerCanadian museum of natureAlbany museumUniversity of chicago profUniversity of the witwatersrandCanadian museumChicago medical centerஒன்றுபட்டது மாநிலங்களில்பல்கலைக்கழகம் ஆஃப் சிகாகோமைக்கேல் பூச்சுகள்பல்கலைக்கழகம் ஆஃப் சிகாகோ மருத்துவ மையம்

Vertebrate Origin Theory Now Questionable With Discovery of Fossilized Fish Larvae

Vertebrate Origin Theory Now Questionable With Discovery of Fossilized Fish Larvae
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South africaUnited statesUniversity of chicagoDave herasimtschukTetsuto miyashitaMichael coatesUniversity of chicago canadian museum natureUs fish wildlife service on wikimedia commonDepartment of organismal biologyCanadian museum of natureAlbany museumChicago canadian museumWildlife serviceWikimedia commonCanadian museumChicago fellow

Long-accepted theory of vertebrate origin upended by fossilized lamprey larvae

E-Mail IMAGE: Artist s reconstruction showing the life stages of the fossil lamprey Priscomyzon riniensis. It lived around 360 million years ago in a coastal lagoon in what is now South Africa. Clockwise. view more Credit: Kristen Tietjen Ottawa, March 10, 2021 - A new study of fossilized lampreys dating from more than 300 million years ago is challenging a long-held theory about the evolutionary origin of vertebrates (all animals with a backbone). The findings are published March 10 in the science journal Nature. Lampreys are ancient, jawless, eel-like fishes that arose around half a billion years ago and they have long provided insights into vertebrate evolution. Now, scientists with the Canadian Museum of Nature, the University of Chicago and the Albany Museum in South Africa are reporting their analysis of dozens of tiny fossils that track the life stages and growth of ancient lampreys, from hatchlings to juveniles to adults.

South africaUnited statesDan smytheKristen tietjenTetsuto miyashitaKristen tietjinMichael coatesUniversity of kansasUniversity of chicagoCanadian museum of natureAlbany museumCanadian museumRob gessPlate devonianMedia relationsDevelopmental reproductive biology

Bloodsucking Fish May Not Be the Vertebrate Ancestor We Thought

Photo: Miguel Riopa/AFP (Getty Images) Derpy from the side and hellish from below, the lamprey is the bane of the Great Lakes fisheries industry. A jawless, bloodsucking fish, the lamprey is often considered an ancestral early vertebrate for its rudimentary morphology and its larval life stage. Now, a team of researchers has authored a new study about fossilized lamprey larvae from the Devonian Period that they say shows lamprey evolution occurred differently than previously thought. This would mean we’d need to change our vertebrate origin story. Advertisement The researchers’ paper was published on Wednesday in the journal Nature. Their argument hinges on the lamprey life cycle. Modern lamprey larvae, called ammocoetes, are blind filter-feeders, which later transform into their noodly, predatory adult selves. Biologists and paleontologists alike have seen that ammocoete larval stage as a relic of early vertebrate evolution, and a sign that lamprey could be relied on as a liv

Great lakesCanada generalUnited statesUniversity of chicagoLake ontarioSouth africaTetsuto miyashitaMichael coatesMiguel riopaJeramiah smithCanadian museum of natureUniversity of kentuckyGetty imagesDevonian periodCanadian museumWikimedia commons

A Bloodsucking Fish May Not Be the Vertebrate Ancestor We Thought

Derpy from the side and hellish from below, the lamprey is the bane of the Great Lakes fisheries industry. A jawless, bloodsucking fish, the lamprey

Great lakesCanada generalUnited statesUniversity of chicagoLake ontarioSouth africaTetsuto miyashitaMichael coatesCanadian museum of natureDevonian periodCanadian museumNorth americaநன்று ஏரிகள்கனடா ஜநரல்ஒன்றுபட்டது மாநிலங்களில்பல்கலைக்கழகம் ஆஃப் சிகாகோ