In 1938, a museum curator sorted through an ordinary trawler catch off South Africa: One strange blue fish revealed a lineage scientists thought had vanished millions of years ago

There are those who come through years of planning and research. And there are those who make surprising appearances in common locations, making one wonder what had occurred even after the discovery.

The coelacanth discovery certainly falls into the latter.

In December 1938, the South African trawler came back to shore with its catch from the Indian Ocean. Among the fish was one that seemed peculiar enough to capture the attention of curator Marjorie Courtenay-Latimer. According to the American Museum of Natural History, what struck Courtenay-Latimer right away was how the fish resembled nothing like any other species. With its body seeming almost prehistoric, the fish could have very well been made out of stone.


What she didn’t realize then was that this particular fish was to become one of the greatest discoveries known to science.

A fish that looked out of another age

The fish caught in the South African waters was not the same fish that would come to mind nowadays, but a creature with thick, fleshy fins and a body structure that looked extremely ancient.

As reported in Smithsonian Magazine, this particular fish was found to belong to the species of coelacanth, which until then were known to science only from their fossils. Scientists believed that coelacanths became extinct millions of years ago, and their extinction was linked to a time when the world was very different indeed.

This was what made the discovery of 1938 such a surprise. Coelacanths were not just another endangered species. Coelacanths were a family of creatures believed by the scientific community to have become extinct millions of years ago.

According to Britannica, coelacanths were previously known only from fossils until the discovery of the fish in the South African waters. The presumption about their extinction remained unchanged over many decades.

But then, out of the blue, it showed up alive.

Why were scientists stunned

One reason for this was the way that extinction was perceived. Fossilization provides an end point. Once a species is gone from the fossil record, people assume that it has been extinct forever.

The coelacanth turned this assumption on its head. According to Smithsonian records, the discovery led people to question how limited human knowledge of the oceans truly was. What happened was not some miraculous return from the dead. Rather, the coelacanth had been thriving out there, unseen, in the deeper parts of the ocean.

This point made the discovery particularly interesting. What the discovery showed was not a miracle or rebirth but the extent to which science still couldn't reach everywhere. Even whole lines of descent might exist beyond human comprehension in places yet poorly understood in the early twentieth century.

This was why the coelacanth discovery captured imaginations. It wasn't that this creature had traveled through time, just that it had been thriving without human notice until now.

More than a “living fossil”

"Living fossil," in fact, was soon applied to the coelacanth, although biologists today take the term in stride when using it.

The importance of the discovery of the coelacanth, according to the American Museum of Natural History and Smithsonian Magazine, comes from the fact that it is a lobe-finned fish, which means that it belongs to an evolutionary branch leading to tetrapods. It is crucial to note, though, that the discovery does not fit into the "missing link" pattern as it is presented in many popular science publications.

The uniqueness of the coelacanth is in the fact that a lot of features of its body represent the traits of an extremely long evolutionary line. This makes the discovery of the fish extremely significant for scientists.

For the first time ever, biologists got a chance to examine a living organism whose evolutionary traits were previously known only by studying fossils.

Why the story still resonates

The discovery of any artifact always has its roots in some kind of ruin, treasure, or historical relic. But the tale of the coelacanth seems particularly peculiar since the object kept under cover was not just a fossil, but a living being all along.

The story still echoes today because it manages to bring together deep time and everyday life. With one catch of a single fish from the sea, the question of extinction and survival was thrown into doubt, as well as our knowledge of the planet itself.

The finding made the coelacanth one of the most famous cases in science where the link between ancient and modern times was preserved in secret form.

This could be the reason behind the longevity of the narrative. It reminds us, even in an age of presumed planetary knowledge, that we may come across a mystery that appears impossible on the surface.