Chinese researchers have achieved a major breakthrough by uncovering fossilized remains of the most ancient bony fish in the southern part of the country, with an estimated age of 436 million years. This discovery, made by specialists from the Institute of Vertebrate Paleontology and Paleoanthropology at the Chinese Academy of Sciences, fundamentally reshapes our understanding of the origin of vertebrate animals. The researchers successfully located well-preserved fragments of jaws, teeth, and skulls belonging to two early fish species that existed long before the primary lineages of bony fish diverged.
Bony fish hold a central position in the history of life’s development on our planet, divided into ray-finned (Actinopterygii) and lobe-finned (Sarcopterygii) groups. The former encompasses over 30,000 modern species, while the latter’s representatives ventured onto land in the distant past, becoming the ancestors of all tetrapods, including humans. For a long time, the initial stages of their evolution remained a scientific enigma, as ancient fossils of the common ancestors for these two main groups were rarely found.
Following a decade of intensive fieldwork and laboratory analysis, the scientists announced two significant findings simultaneously. Within early Silurian period deposits, they discovered a species named Eosteus, which represents the world’s oldest and most complete bony fish fossil. Despite its minuscule size of just 3 centimeters, the fossil retains its structure from head to tail, exhibiting a remarkable combination of primitive and more advanced traits. “These features imply that the crucial characteristics of bony fish developed earlier than previously believed by scientists,” noted the authors of this extensive study.
The second crucial subject of investigation was the fish Megamastax, which lived around 423 million years ago and could reach over a meter in length. Utilizing contemporary volumetric scanning technologies, researchers were able to reconstruct the structure of its skull and teeth, as reported by SciTechDaily. This advancement resolved a scientific puzzle regarding the structure of ancient fish dental plates—a problem paleontologists had wrestled with for over half a century.
Detailed examination revealed that both newly found species belong to the earliest group of bony fish and represent a crucial evolutionary link. They clearly illustrate the appearance of the common ancestor to the majority of modern fish and all terrestrial vertebrates before their definitive separation into distinct species. These singular finds not only illuminate the intricacies of ancient creature anatomy but also strongly suggest that the territory of modern southern China served as a primary hub for the emergence and evolution of Earth’s early vertebrate inhabitants.
About the Author
