News
Scientist hails ‘jaw-dropping’ fish fossil discovery
A leading British scientist has said that the discovery of a 419-million-year-old fish fossil in China is a stunning and spectacular development.
Palaeobiologist Matt Friedman claims that the fish provided crucial evidence about the evolutionary development of jawed vertebrates.
As a remote relative of humans, it provides important evolutionary clues.
“It is the deepest branch of our family tree that bears the kinds of jaw bones found in humans,” Dr Friedman said.
The fossil was found at China’s Xiaoxiang Reservoir, and was reported by the journal Nature on Thursday.
Scientists say that the heavily armoured fish, Entelognathus primordialis, is a previously unknown member of jawed vertebrates also known as gnathostomes. It has a complex small skull and jaw-bone structure.
“This is an unexpected discovery that inverts schoolbook teaching on the evolution of bony skulls,” Dr Friedman said.
“Up until now it had been thought that the anatomical peculiarities of bony fishes – the group that would eventually give rise to human beings – are specialisations that arose later in vertebrate evolutionary history in our own bony fish lineage.”
“But now that narrative has been turned on its head.”
Dr Friedman said that the fish’s jaw was much more like that of a modern bony fish – which is why its discovery may offer a new perspective on the early evolution of these creatures.
His review of the significance of the fossil find also appears in the latest edition of Nature.
Scientists say that the evolution of jaws is one of the key episodes in the evolution of vertebrates, but the gap between jawed and jawless vertebrates is so large that it is hard to work out the individual evolutionary steps in the transition.
“While this fossil does not tell us anything about the origin of jawed fishes from jawless ones, it does tell us about subsequent modifications to jaw structure that we thought were unique to bony fishes,” Dr Friedman said.
It is thought that modern jawed vertebrates, such as sharks and bony fishes, emerged from a collection of jawed, armoured fishes known as placoderms.
Entelognathus primordialis has jaw-bone features previously restricted to bony fishes (osteichthyans) as well as full body armour seen in placoderms, and it would have been around 20cm (7.8in) long.
Dr Friedman says that the fossil adds weight to the theory that many classic bony fish features were evolved “very deep in our family tree, before bony fish split from sharks”.
“This means that we – as in bony fishes – are the ones who have held on to more ancient structures, while it is the sharks that have gone off and done something new and interesting in an evolutionary sense.
“They are the ones that have most radically modified this pattern, which we now understand is probably primitive to all modern jawed vertebrates.”
Source: www.bbc.co.uk/news
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Renowned anti-whaling activist Paul Watson has been released from custody in Greenland after spending five months in detention. Denmark’s Justice Ministry rejected Japan’s request for his extradition, citing insufficient guarantees that his time already served in custody would be credited against any potential sentence.
The 74-year-old Canadian-American was arrested on July 21 in Nuuk, Greenland’s capital, when his ship docked to refuel. His arrest was based on a 2012 Japanese warrant related to a 2010 encounter in Antarctic waters. Japan alleged Watson obstructed operations and caused damage to a whaling research ship during efforts to disrupt illegal whaling. Watson has consistently denied these claims, maintaining his commitment to marine conservation.
Denmark, which oversees extradition matters for Greenland, concluded that while the legal conditions for extradition were met, the lack of assurances from Japan regarding time-served credit made extradition untenable.
In a video shared by his foundation, Watson expressed gratitude and relief, saying, “After five months, it’s good to be out… and good to know they’re not sending me to Japan.” He added that the most difficult part of his time in custody was being separated from his two young sons.
Watson is a pioneering figure in marine conservation, known for founding the Captain Paul Watson Foundation in 2022 after decades of activism with the Sea Shepherd Conservation Society. His bold efforts to defend marine life have earned him widespread support, including from celebrities and conservationists. His work has also been featured in the acclaimed reality TV series Whale Wars.
Watson’s lawyer, Jonas Christoffersen, praised the decision, stating, “We are happy and relieved that Paul Watson is now free.” He added that Watson is eager to reunite with his family and continue his vital work.
The arrest occurred while Watson’s vessel, the M/Y John Paul DeJoria, was en route to the North Pacific with a team of 26 volunteers to intercept a Japanese whaling ship. His foundation described the arrest as politically motivated and emphasized that Watson’s actions were focused on ending illegal whaling practices.
Japan resumed commercial whaling in 2019 after leaving the International Whaling Commission, asserting that whale meat is a cultural tradition. Conservationists, however, continue to challenge these practices, highlighting their impact on marine ecosystems.
Despite the challenges, Watson remains steadfast in his mission to protect marine life and bring attention to whaling practices. His dedication to ocean conservation has made him a globally respected advocate for the environment.
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