Paleontologists have uncovered fossils of a massive, land-dwelling crocodile-like predator in the Caribbean, challenging long-held assumptions about the region’s ancient ecosystems. The discovery, detailed in Proceedings of the Royal Society B, reveals that sebecids, swift, carnivorous reptiles resembling “crocodile greyhounds”, thrived on Caribbean islands millions of years after their mainland relatives went extinct.
The fossils, including a serrated tooth and vertebrae found in the Dominican Republic, belong to Sebecus, a sebecid species that once dominated South America as apex predators after the dinosaurs’ demise. Standing up to 20 feet long with armored skin and agile limbs, these creatures hunted prey on land, unlike modern crocodiles. The Caribbean findings, dating back 18–29 million years, suggest sebecids survived there 5 million years longer than elsewhere, possibly due to temporary land bridges from South America, as proposed by the GAARlandia hypothesis.
“This emotion of finding the fossil and realizing what it is—it’s indescribable,” said lead author Lázaro Viñola Lopez, a University of Florida graduate researcher.
The discovery aligns with the idea of islands as “museums of biodiversity,” preserving species long after their mainland extinction. Yet, uncovering such fossils is rare due to the Caribbean’s erosive climate. Roadwork in the Dominican Republic accidentally exposed the site, enabling the breakthrough.
The study reshapes understanding of the Caribbean’s prehistoric food chain, hinting at more undiscovered giants. As co-author Jonathan Bloch noted, “The presence of a large predator is different from what we imagined.” With ongoing explorations, this sebecid may herald a wave of fossil revelations—what Viñola-Lopez calls “the tip of the iceberg.”
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