Ancient Toothed Platypus Fossils Discovered in South Australian Outback
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Paleontologists have discovered fossils of Obdurodon insignis, the oldest known species of toothed platypus, in the remote South Australian outback. The findings, detailed in the journal Australian Zoologist, reveal the animal lived approximately 25 million years ago in a landscape of lakes, rivers, and forests. This discovery expands our understanding of the platypus lineage.
Facts First
- Fossils of Obdurodon insignis discovered east of the Flinders Ranges
- Species is the oldest known toothed platypus, living ~25 million years ago
- Habitat included lakes, rivers, and forested lowlands of central Australia
- Possessed well-formed molars and premolars, unlike modern platypuses
- Discovery based on over 20 years of expeditions collecting thousands of fossils
What Happened
Paleontologists from Flinders University discovered fossils east of the Flinders Ranges in the remote outback of South Australia. The fossils belong to Obdurodon insignis, described as the oldest known species of toothed platypus. The findings were published in the journal Australian Zoologist. Obdurodon insignis lived during the late Oligocene period approximately 25 million years ago. Its habitat included huge lakes, slow-flowing rivers, and forested lowlands of central Australia. The species possessed well-formed molars and premolars, whereas modern platypuses lose vestigial teeth shortly after birth. A newly discovered premolar shows Obdurodon insignis had large, pointed front teeth and large robust molar teeth. A scapula fossil indicates it swam and moved similarly to the modern platypus, though it was slightly larger.
Why this Matters to You
This discovery connects you to a deeper history of Australia's unique wildlife. It shows the platypus lineage is more ancient and diverse than previously known, having adapted to environments that no longer exist. The research may help scientists understand how species evolve in response to changing climates and landscapes over millions of years.
What's Next
The Flinders University team has conducted expeditions to the site for over 20 years and has collected more than a thousand fossils of non-fish vertebrate animals, including three fossils of the toothed platypus. This suggests further discoveries in the region could be likely. Continued study of these fossils may provide more details about the ecology of the late Oligocene period, which included arboreal mammals like koalas and possums, the giant eagle Archaehierax, and sheep-sized marsupials.