10 July 2025 The Future is the Product of the Past

The discovery of a 380-million-year-old heart sheds new light on our bodies’ evolution

Researchers from Curtin University have discovered the world’s oldest heart in a ‘beautifully preserved’ ancient jawed fish fossil 380 million years old.

The heart was discovered alongside a separate fossilized stomach, intestine, and liver, with the organs arranged in a manner similar to modern shark anatomy.

The new research, published today in Science, found that the position of the organs in the body of arthrodires – an extinct class of armored fishes that flourished through the Devonian period from 419.2 million years ago to 358.9 million years ago – is similar to modern shark anatomy, offering vital new evolutionary clues.

“Evolution is often thought of as a series of small steps, but these ancient fossils suggest there was a larger leap between jawless and jawed vertebrates,” said Professor Kate Trinajstic, lead researcher from Curtin’s School of Molecular and Life Sciences and the Western Australian Museum, in a statement.

“These fish literally have their hearts in their mouths and under their gills – just like sharks today.”

“For the first time, we can see all the organs together in a primitive jawed fish, and we were especially surprised to learn that they were not so different from us.”

“However, there was one critical difference – the liver was large and enabled the fish to remain buoyant, just like sharks today. Some of today’s bony fish such as lungfish and birchers have lungs that evolved from swim bladders but it was significant that we found no evidence of lungs in any of the extinct armored fishes we examined, which suggests that they evolved independently in the bony fishes at a later date.”

The specimen is not only remarkable in its age but also that it was preserved in its 3D form, something which the researchers didn’t become completely aware of until they were at the scanning stage.

Lead researcher John Curtin Distinguished Professor Kate Trinajstic, from Curtin’s School of Molecular and Life Sciences and the Western Australian Museum, said the discovery was remarkable given that soft tissues of ancient species were rarely preserved and it was even rarer to find 3D preservation.

“As a paleontologist who has studied fossils for more than 20 years, I was truly amazed to find a 3D and beautifully preserved heart in a 380-million-year-old ancestor,” Professor Trinajstic said.

“Evolution is often thought of as a series of small steps, but these ancient fossils suggest there was a larger leap between jawless and jawed vertebrates. These fish literally have their hearts in their mouths and under their gills – just like sharks today.”

This research presents – for the first time – the 3D model of a complex s-shaped heart in an arthrodire that is made up of two chambers with the smaller chamber sitting on top.

Professor Trinajstic said these features were advanced in such early vertebrates, offering a unique window into how the head and neck region began to change to accommodate jaws, a critical stage in the evolution of our own bodies.

The Gogo Formation, in the Kimberley region of Western Australia where the fossils were collected, was originally a large reef.

The 380-million-year-old heart belonged to a now-extinct armored fish. Photo: Curtin University

Enlisting the help of scientists at the Australian Nuclear Science and Technology Organisation in Sydney and the European Synchrotron Radiation Facility in France, researchers used neutron beams and synchrotron x-rays to scan the specimens, still embedded in the limestone concretions, and constructed three-dimensional images of the soft tissues inside them based on the different densities of minerals deposited by the bacteria and the surrounding rock matrix.

This new discovery of mineralized organs, in addition to previous finds of muscles and embryos, makes the Gogo arthrodires the most fully understood of all jawed stem vertebrates and clarifies an evolutionary transition on the line to living jawed vertebrates, which includes the mammals and humans.

Co-author Professor John Long, from Flinders University, said: “These new discoveries of soft organs in these ancient fishes are truly the stuff of palaeontologists’ dreams, for without doubt these fossils are the best preserved in the world for this age. They show the value of the Gogo fossils for understanding the big steps in our distant evolution. Gogo has given us world firsts, from the origins of sex to the oldest vertebrate heart, and is now one of the most significant fossil sites in the world. It’s time the site was seriously considered for world heritage status.”

Co-author Professor Per Ahlberg, from Uppsala University, said: “What’s really exceptional about the Gogo fishes is that their soft tissues are preserved in three dimensions. Most cases of soft-tissue preservation are found in flattened fossils, where the soft anatomy is little more than a stain on the rock. We are also very fortunate in that modern scanning techniques allow us to study these fragile soft tissues without destroying them. A couple of decades ago, the project would have been impossible.”

The Curtin-led research was a collaboration with Flinders University, the Western Australian Museum, the European Synchrotron Radiation Facility in France, the Australian Nuclear Science and Technology Organisation’s nuclear reactor, Uppsala University, Monash University’s Australian Regenerative Medicine Institute, and the South Australian Museum.

Curtin University

Journal reference:

Trinajstic, K., et al. (2022) Exceptional preservation of organs in Devonian placoderms from the Gogo lagerstätte. Science. doi.org/10.1126/science.abf3289.

Related Articles

A prehistoric monument consisting of three round enclosures, one of which resembles a horseshoe, was discovered in France

7 April 2024

7 April 2024

Archaeologists from the French National Institute for Preventive Archaeological Research (INRAP) unearthed an unusual, prehistoric monument in the shape of...

Fossil found at the edge of the Tibetan Plateau reveals an owl active during the day 6 million years ago

29 March 2022

29 March 2022

The incredibly well-preserved fossil skeleton of an extinct owl that lived was discovered on the edge of the Tibetan Plateau,...

Europe’s Oldest Boomerang: A 40,000-Year-Old Mammoth Ivory Artifact Discovered in Poland

27 June 2025

27 June 2025

An international team of scientists has uncovered the oldest known boomerang in Europe, a 72-centimeter tool meticulously carved from mammoth...

5,500-year-old Menhir discovered in Portugal

28 August 2023

28 August 2023

A 5,500-year-old (that is around 3500 BC) menhir has been discovered in the town of São Brás de Alportel in...

Magical Roman Phallus Wind Chime Unearthed in Serbia

15 November 2023

15 November 2023

Archaeologists have unearthed a Roman phallus wind chime known as a tintinnabulum, during excavations at the ancient city of Viminacium...

Ancient stone grenades discovered at Badaling Great Wall in Beijing

16 October 2023

16 October 2023

Chinese archaeologists have unearthed 59 ancient stone grenades from the ruins of a building in the western section of the...

Tutankhamun of Kazakhstan, “Golden Man”

1 August 2024

1 August 2024

The Golden Man, the main symbol of Kazakhstan’s independence, is a warrior’s costume from about the 5th century BC that...

A new Archaeological Site has been Discovered in Oman

7 July 2021

7 July 2021

Oman‘s Ministry of Heritage and Tourism recently discovered an ancient site in the town of Al Khobar, Sumail Province, Al...

New research determines portable toilets of the ancient Roman world

11 February 2022

11 February 2022

New research published today reveals how archeologists can determine when a pot was used by Romans as a portable toilet,...

Małopolskie Region Reveals Oldest Evidence of Metal Mining in Poland, Dating Back 1,000 Years Earlier Than Previously Thought

16 February 2025

16 February 2025

Researchers have uncovered the oldest confirmed evidence of metal ore mining and metallurgy in Poland through the study of lead...

The 890-million-year-old sponge fossil may be the oldest animal yet discovered

1 August 2021

1 August 2021

890-million-year-old fossil sponges found in the “Little Dal” limestones of northwest Canada may be the oldest animal ever found. According...

‘Theodoric the Great’ villa mosaic found near Verona in Italy

17 April 2022

17 April 2022

A section of the ancient Roman mosaic flooring from the 5th century AD villa of Ostrogoth king Theodoric the Great...

A relief of a man holding his Phallus was found in Sayburç, one of the Taş Tepeler

18 October 2021

18 October 2021

In Sayburç, one of the Taş Tepeler in Şanlıurfa, a five-figure scene consisting of humans, leopards, and a bull was...

History, geography, and evolution are rewrites thanks to an incredible dinosaur trove discovered in Italy

2 December 2021

2 December 2021

A dinosaur trove in Italy rewrites the history, geography, and evolution of the ancient Mediterranean area. Italy is not exactly...

Meaning of Agora Gate Found in Turkey’s Ancient City of Aizanoi

8 June 2021

8 June 2021

The good news continues to come from the ancient city of Aizanoi, located in Çavdarhisar district, 50 km from Kütahya....