Exploring 129,000 Years of Crocodilian Evolution in Australasia
129,000 years of crocodiles: what we know about Australasia’s ancient apex predators
The Conversation
Image: The Conversation
A recent study reveals that Australasia was once home to a diverse group of crocodilians known as mekosuchines, which thrived for over 50 million years before their extinction. Evidence from archaeological sites indicates a long coexistence between humans and modern crocodiles, while the fate of mekosuchines remains uncertain, possibly linked to human activities.
- 01Mekosuchines were apex predators in Australasia for over 50 million years, exhibiting diverse forms and habitats.
- 02Archaeological findings indicate that Indigenous Australians depicted crocodiles in rock art dating back around 20,000 years.
- 03Fossils of mekosuchines in Australia are primarily from over 40,000 years ago, with no evidence of human interaction.
- 04On islands like New Caledonia, some mekosuchine species survived until human settlement, suggesting possible direct encounters.
- 05The extinction of these ancient crocodiles may serve as a warning for current conservation efforts amid accelerating extinctions.
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The study of crocodilian history in Australasia over the past 129,000 years reveals a complex narrative involving ancient apex predators known as mekosuchines, which thrived for over 50 million years. While modern crocodiles belong to the genus Crocodylus, mekosuchines exhibited a remarkable variety of forms and sizes, adapting to diverse environments across the region. Evidence from archaeological sites indicates that humans coexisted with modern crocodiles for thousands of years, as reflected in ancient rock art that dates back around 20,000 years. However, the fate of mekosuchines remains unclear, as they disappeared around the same time as other megafauna, possibly due to environmental changes or human interactions. In contrast, some mekosuchine species on islands like New Caledonia survived until human settlement, indicating a more direct relationship with early humans. The extinction of these ancient crocodilians serves as a cautionary tale for current conservation efforts, emphasizing the need for collaboration between palaeontologists, ecologists, and Indigenous communities to protect remaining crocodiles and their ecosystems.
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The extinction of ancient crocodilians highlights the importance of conservation efforts for remaining species, particularly in regions like Australia where biodiversity is under threat.
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