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🤯 Did You Know (click to read)
Teleost fishes, which dominate today’s oceans, diversified significantly after earlier shark lineages were established.
Hexanchiform shark fossils indicate that their lineage was established before many modern teleost fish groups diversified. They occupied marine food webs during eras when today’s dominant fish had not yet evolved.
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💥 Impact (click to read)
Persisting through massive ecological turnovers required flexibility and resilience. Deep-water refuges may have shielded them from surface-level disruptions.
A lineage that hunted ancient oceans and still dominates parts of the deep sea today demonstrates evolutionary endurance on a planetary timescale.
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