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The last dicynodont: an Australian Cretaceous relict
1School of Geosciences, Monash University, PO Box 28E, Clayton, VIC 3800, Australia. paswamp@mailbox.uq.edu.au
Proceedings. Biological Sciences
|June 14, 2003
Summary
Fossil evidence shows mammal-like reptiles called dicynodonts survived in Australia until the Early Cretaceous, significantly extending their known history. This discovery highlights Australia
Area of Science:
- Paleontology
- Vertebrate Zoology
- Mesozoic Ecosystems
Background:
- Dicynodonts (mammal-like reptiles) were thought to have gone extinct in the Late Triassic.
- Geographical isolation profoundly impacted Australia's unique terrestrial faunas during the Mesozoic.
Purpose of the Study:
- To report the discovery of exceptionally preserved fossil evidence of a late-surviving dicynodont.
- To reassess the temporal range and biogeographical significance of dicynodonts in Australia.
Main Methods:
- Analysis of newly discovered fossil remains.
- Radiometric dating of associated geological strata.
- Comparative anatomical studies with known dicynodont and other tetrapod fossils.
Main Results:
- Fossil evidence indicates dicynodonts inhabited Australia during the Early Cretaceous (ca. 110 million years ago).
- This finding extends the known duration of dicynodont history from approximately 63 million years to 170 million years.
- The survival suggests significant impact of Australia's geographic isolation on its fauna.
Conclusions:
- Dicynodonts persisted much later than previously believed, surviving into the Early Cretaceous in Australia.
- Australia's geographic isolation played a crucial role in the prolonged survival of this lineage.
- This late-surviving Australian dicynodont may represent an ecological counterpart to Cretaceous horned dinosaurs in other regions.