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On 22 December 1938, museum curator Marjorie Courtenay-Latimer examined an unusual fish brought ashore by a trawler at East London, South Africa. Its blue appearance and fleshy, lobed fins did not match ordinary local catches. The fish proved to be a coelacanth—a living member of a lineage known mainly from fossils and widely presumed to have disappeared from the record roughly 65 million years earlier.
What is a coelacanth?
A coelacanth is a lobe-finned fish with paired fins supported by fleshy, limb-like structures. The 1938 specimen belonged to a species later named Latimeria chalumnae. A second living species, Latimeria menadoensis, was documented in Indonesia after captures in 1997 and 1998 and formally described in 1999.
“Living fossil” is useful shorthand for a surviving species from an ancient lineage, but it does not mean the modern fish is a fossil species returned unchanged. Coelacanths have evolved, and scientists continue to discuss their exact position among lobe-finned fishes. Lungfish, rather than coelacanths, are the closest living relatives of land vertebrates (tetrapods). Coelacanths are not direct human ancestors, and the 1938 discovery did not show that they had walked onto land.
Why was the coelacanth thought to be extinct?
Before 1938, coelacanth fossils were known from ancient rocks, while no younger fossils had been identified. Smithsonian Ocean describes the group as having been thought extinct approximately 65 million years ago. The Natural History Museum cites the youngest known fossil at about 66 million years and discusses an extinction estimate of roughly 70 million years elsewhere. These figures are rounded descriptions of a gap in the fossil record, not the age of the fish caught in South Africa.
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Some popular accounts use still broader figures, including around 80 million years. The defensible point is that the fossil record appeared to end tens of millions of years before the living fish was recognized. Fossil dates are estimates that vary with newly assessed specimens and dating methods.
How was the coelacanth rediscovered?
The trawl catch
On 22 December 1938, a fishing trawl landed its catch near the Chalumna River. Courtenay-Latimer, curator of the East London Museum, noticed one fish among the haul. She described a striking blue fish with unusual fins and preserved the specimen for examination.
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Smith’s identification
Courtenay-Latimer contacted J. L. B. Smith, an ichthyologist who was away at the time. In a letter reproduced by the Natural History Museum, Smith wrote that the drawing and description resembled forms “which have been extinct for many a long year” and that the fish must be of great scientific value.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteSmith examined the preserved specimen in February 1939. He identified it as a coelacanth and named the species Latimeria chalumnae: Latimeria honored Courtenay-Latimer, while chalumnae referred to the nearby Chalumna River. Recalling his first sight of the fish in his 1956 book Old Fourlegs, Smith wrote: “I stood as if stricken to stone. Yes, there was not a shadow of a doubt, scale by scale, bone by bone, fin by fin, it was a true Coelacanth.”
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Was 1938 the first time humans knew about coelacanths?
No. The event was a scientific rediscovery, not the first human encounter. The Natural History Museum records that Comorian fishers already knew the fish as gombessa and caught it during night fishing before it entered Western scientific collections. Their local knowledge preceded the museum identification by decades.
The first documented population after the South African specimen was found around the Comoros in the western Indian Ocean. Later records established that coelacanths also live in Indonesian waters. Their known range is therefore broader than the single South African trawl location that made the species famous.
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How do the two living species differ?
| Species | Known range | Key historical evidence | What the record establishes |
|---|---|---|---|
| Latimeria chalumnae | Western Indian Ocean, including the Comoros and African coastal waters | South African trawl specimen identified in 1939; later Comorian population documented | The species behind the 1938 rediscovery |
| Latimeria menadoensis | Indonesian waters | Captures documented in 1997–98; described as a distinct species in 1999 | A second living coelacanth species, separate from the African form |
Discovery dates and locations do not by themselves provide a population estimate. The two species should not be assumed to have identical abundance, threats or legal status.
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What does a coelacanth look like in the water?
The fish is recognizable by its fleshy paired fins, three-lobed tail and distinctive body shape. The 1938 specimen appeared vivid blue, a description that helped make the story memorable. Color can look different under different lighting: NOAA describes the African coelacanth as brown with pale blotches under natural light. A blue appearance in a preserved specimen or footage should not be treated as a universal color standard.
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Why does the discovery still matter?
The catch changed assumptions about how confidently scientists could infer extinction from an incomplete fossil record. A group that appeared absent for tens of millions of years was still alive in deep coastal habitats. The episode also demonstrated the importance of museum curators, fishing crews and local observers: Courtenay-Latimer recognized the anomaly, Smith supplied the taxonomic confirmation, and Comorian fishers had long known the animal.
It also gave scientists a living animal for studying an ancient branch of vertebrate evolution. That opportunity does not make the coelacanth a frozen snapshot of prehistory; it makes it a modern species whose anatomy retains traits inherited from a very old lineage.
Are coelacanths endangered?
Conservation status must be stated by population and jurisdiction. NOAA describes the Tanzanian distinct population segment as likely small and identifies bycatch and habitat destruction as threats. African coelacanths are protected under CITES Appendix I throughout their African range. Those statements concern the specified African populations and legal framework; they should not automatically be applied to every Indonesian or other population.
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Because coelacanths live in deep habitats and are often encountered as accidental catches, reducing bycatch and protecting habitat are central conservation measures. The available historical accounts do not support a single global population total.
The essential timeline
- 22 December 1938: Courtenay-Latimer sees the unusual trawl-caught fish at East London, South Africa.
- February 1939: J. L. B. Smith examines the specimen and identifies it as a coelacanth.
- 1939: Smith names Latimeria chalumnae.
- 1997–1998: Coelacanths are documented in Indonesian waters.
- 1999: The Indonesian form is described as Latimeria menadoensis.
The accurate way to tell the story
A trawler did not pull up a 65-million-year-old fish. It caught a living coelacanth in 1938, at a time when scientists believed the lineage had vanished from the fossil record approximately 65 million years earlier. Courtenay-Latimer made the observation, Smith established the identity, and local fishers’ prior knowledge shows that scientific recognition and human discovery are not always the same event.
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