Full Breakdown
Triassic Marine Reptile Fossil Preserves Intact Digestive System
7/31/2026, 1:45:29 AM
Discovery and Preservation
In 2023 a nearly complete skeleton of *Austronaga minuta* was uncovered in Yunnan province, China. The 60-centimetre specimen dates to the Early Triassic, about 245 million years ago, and retains the stomach, liver, intestines, visible blood vessels and even scales from a partially digested fish.
Scientific Context
*Austronaga* belongs to the archosaur lineage that later gave rise to dinosaurs, birds and crocodiles, but it is not a dinosaur itself. Its anatomy—long neck, front flippers, and a powerful tail—indicates a fully aquatic lifestyle, suggesting that archosaur colonisation of marine environments began earlier than previously thought. The specimen provides a rare glimpse of the basic reptilian digestive plan, which has changed little over 245 million years.
Key Findings
- Age: ~245 million years (Early Triassic).
- Size: 60 cm total length; unknown adult size.
- Preservation: Two-dimensional soft-tissue outlines of stomach, liver, intestines, and fish scales.
- Functional morphology: Tail for propulsion, front flippers for steering, long neck for catching prey.
Official Statements & Responses
John Long of Flinders University, who was not involved in the research, called the find a “world treasure” for its exceptional preservation.
Verbatim Quotes
- “A fossil this age with such clear preservation of its organs is really a world treasure,” — John Long, at Flinders University in Adelaide, Australia
- “This was certainly a good and agile swimmer, mainly using its tail for swimming, its long front flippers for steering and its long neck to catch fish,” — Stephan Spiekman
