Recently discovered species of coelacanth, which thrived at the end of the Triassic period around 200 million years ago, have been identified from museum specimens excavated in the UK over a century and a half ago.
Reconstruction of the large Mausonian Coelacanth artist from the Lezians of England. Image credit: Daniel Phillips.
Coelacanths are unique fish that first appeared in the early Devonian epoch fossil record approximately 419 million years ago.
Since the Paleozoic and Mesozoic periods, over 175 fossil coelacanth species have been identified.
During the Mesozoic Era, these fish exhibited significant diversification, with some species developing unusual body shapes.
However, at the close of the Cretaceous period, around 66 million years ago, they inexplicably vanished from the fossil record.
It is believed that coelacanths went extinct due to a mass extinction event during the Cretaceous period. Nonetheless, in 1938, the first specimen of the living species Latimeria chalumnae was fortuitously captured in South Africa.
“Our team has encountered numerous fossils that were initially classified as small marine reptiles. Pachistrophius,” said Professor Mike Benton of the University of Bristol, who is a senior author of the study.
“Many Pachistrophius share peculiar similarities with coelacanth fossils, but we’ve traveled to collections nationwide and discovered that this misidentification has occurred repeatedly.”
“Notably, several of these specimens have been stored in museum facilities, including public collections, since the 1800s,” stated Jacob Quinn, a paleontologist at the University of Bristol.
“From four previous reports of coelacanths from the Triassic era in the UK, we identified more than 50 individuals.”
Paleontologists conducted X-ray scans of numerous specimens to verify their identification.
The specimens mainly belong to the extinct group Mawsoniidae of the coelacanth, while also being closely related to living fish.
“The materials we identified are isolated specimens, but we can see they originate from individuals of various ages, sizes, and species.”
Dr. David Whiteside, a paleontologist at the University of Bristol, remarked:
“Like modern coelacanths, these large fish are opportunistic predators, lurking along the seabed and likely preying on whatever they encountered, including small Pachistrophius marine reptiles, which have been misidentified as coelacanth fossils for decades.”
The study is set to be published in the Journal of Vertebrate Paleontology.
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Jacob Quinn et al. 2025. British Triassic coelacanth fish. Journal of Vertebrate Paleontology 45: E2520921; doi: 10.1080/02724634.2025.2520921
Source: www.sci.news
