New research reveals that the giant kangaroo species Protemnodon tumbuna existed on the coast of New Guinea until around 6,000 years ago. This finding, published in npj Biodiversity, suggests that some Australian and New Guinean megafauna survived much longer than previously thought.
Understanding Protemnodon tumbuna
The Protemnodon tumbuna, first identified in 1983, was a large, muscular kangaroo that primarily moved on all fours, unlike modern kangaroos. This species thrived in the mountain rainforests of New Guinea around 50,000 years ago, but evidence suggests it may have outlasted its relatives.
Research indicates that while most megafauna in Australia disappeared by 41,000 years ago, Protemnodon tumbuna continued to inhabit northern New Guinea until approximately 6,000 years ago. This challenges the conventional timeline of megafauna extinction, indicating a more complex narrative influenced by various factors.
Evidence of Late Survival in New Guinea
Excavations at sites such as Nombe rockshelter and Lachitu cave have uncovered fossils and remains of Protemnodon tumbuna, dating as recently as 18,000 years ago. For instance, a tooth found in Lachitu cave, while uncertain in dating, suggests the species may have persisted far longer than originally believed.
In 2004, excavations at the Taora rockshelter revealed a finger bone from a macropodid, likely belonging to Protemnodon tumbuna. This fossil exhibits distinct features that align it closely with Protemnodon, reinforcing the hypothesis of its prolonged survival.
Human Interaction with Megafauna
The coexistence of humans and Protemnodon tumbuna suggests that early inhabitants of New Guinea lived alongside this megafauna for thousands of years. Archaeological evidence indicates that as sea levels fell 6,800 years ago, human activity intensified in the region, leading to significant interactions with local wildlife.
This prolonged coexistence raises questions about the role of humans in the eventual extinction of megafauna. While hunting may have played a part, the unique biology and ecology of each species likely influenced their survival rates against factors like habitat change and hunting pressure.
- Protemnodon tumbuna discovered in 1983
- Survived until approximately 6,000 years ago
- Fossils found in Nombe and Lachitu caves
- Human activity increased post-sea level rise
Overall, this research contributes to a nuanced understanding of how megafauna species like Protemnodon tumbuna adapted and survived in changing environments.
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