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What was discovered—and what “nearly complete” means
The Lima presentation identified the fossil as Cosmopolitodus hastalis, an extinct shark from the Pisco Formation, dated to roughly 9 million years ago. Reuters’ footage describes preserved jaw and vertebral material, as well as stomach contents. INGEMMET engineer César Augusto Chacaltana called its fossilization exceptional. That is a presenter’s characterization, not a published comparative measurement of preservation quality.
The fossil was presented as unusually informative material, but the available reporting does not provide a complete inventory of every preserved bone or establish that the animal’s entire skeleton was recovered. “Nearly complete” should therefore not be taken to mean an intact whole skeleton.
How large was this shark?
INGEMMET gives an estimated adult length of 7–9 meters for C. hastalis. This is an estimate for adults of the species; it is not the measured length of the fossil presented in 2025. The institutional material cited for that estimate does not verify the headline’s 9-centimeter tooth measurement, so that figure should not be treated as confirmed.
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Was it really an ancestor of the great white?
The researchers presenting the fossil used ancestor language, but the evolutionary relationship is better described with care. The Florida Museum of Natural History notes that hastalis has appeared in scientific classifications under several genera, including Isurus, Cosmopolitodus and Carcharodon. The museum says many paleontologists regard it as ancestral to the living great white, while the differing placements show that its classification has not been uniform. The 2025 presentation is not, by itself, proof that the family tree has been settled.
What the presenters said about its last meal
Paleontologist Mario Urbina Schmitt said the fossil’s stomach contents included many sardines. Reuters’ English transcript translates his remarks from Spanish: “It is a pelagic shark. Inside it, we found stomach contents and many sardines. At that time, there were no anchovies, so sardines formed the essence of the diet for all marine animals.” This is an attributed account from the presentation, not a quantitative study establishing the species’ full diet or the food web of the period.
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How this fossil differs from an earlier Peruvian shark
A separate fossil from Peru, reported by the Florida Museum in 2009, is younger: about 4–5 million years old. It preserved a complete jaw with 222 teeth and 45 vertebrae. Using tooth size and growth rings in vertebrae, researchers estimated that animal was about 20 years old and 17–18 feet (roughly 5.5 meters) long. It is not the fossil presented in Lima in 2025.
| Evidence | 2025 presentation | Florida Museum fossil reported in 2009 |
|---|---|---|
| Age and context | About 9 million years old; Pisco Formation | About 4–5 million years old; a separate Peruvian fossil |
| Reported remains | Jaw and vertebral material; presenters also reported stomach contents | Complete jaw with 222 teeth and 45 vertebrae |
| What the reporting emphasizes | Identification as C. hastalis, preservation and presenters’ interpretation of its relationship to great whites | White-shark origins; the preserved teeth in position helped inform comparisons unavailable from isolated teeth |
| Estimated body length | INGEMMET estimates 7–9 meters for adult members of the species; not a measurement of this fossil individual | About 17–18 feet (roughly 5.5 meters) for the separate specimen, estimated from tooth size and vertebral growth rings |
The earlier fossil illustrates why teeth preserved in position with other remains matter: their arrangement provides evidence that isolated teeth cannot. It offers useful context, but its measurements and findings cannot be transferred to the 9-million-year-old fossil.
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What the discovery can—and cannot—show
- It documents a fossil identified as Cosmopolitodus hastalis, dated to about 9 million years ago in Peru’s Pisco Formation.
- INGEMMET’s 7–9-meter estimate describes adult size for the species, not the presented fossil’s measured length.
- The 2025 presentation added reported stomach contents and jaw and vertebral material to the account of this fossil, but the cited reporting does not supply a detailed peer-reviewed analysis of the individual.
- The great-white connection is a significant evolutionary interpretation, not a universally settled taxonomic label.
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