Topic: Biology
Scientists from Flinders University studied ancient armored fish called placoderms. They found that these early jawed fish evolved two different ways of biting other armored prey in the oceans of prehistoric Australia.
Long before dinosaurs roamed the Earth, fierce predatory fish developed crushing jaws and sharp teeth to survive and diversify in ancient oceans.
These armored fish were called placoderms. They were the first vertebrates to evolve jaws and teeth more than 400 million years ago. Researchers from Flinders University used a new combination of techniques to find out how these early jawed fish caught their prey on an exotic ancient reef that once covered what is now northern Western Australia.
The scientists were surprised to discover that these early jawed fish evolved two different ways of biting other armored prey in the rich marine ecosystems of prehistoric Australia. They found that smaller species relied on broad, flat crushing plates to pulverize whole prey, while larger species evolved weapon-like teeth that pierced and broke apart shelled and armored prey.
The researchers used a new finite element analysis technique, with computer-based simulations and three-dimensional analysis of their biting surfaces, to reconstruct how eight of these species fed in the oceans 385 million years ago. They performed digital bite simulations on 3D models of the fossil jaw bones to measure how well they supported biting forces before comparing these results with the complexity of each species' biting surface.
The researchers discovered that both the largest and smallest placoderms possessed the strongest jaws for handling hard bites, despite using completely different biting tools. The answer lies in the relationship between predator and prey body size when it comes to biting armored prey with tough exterior shells.
Why It Matters
Understanding how ancient fish evolved unique ways to eat prey can help us learn more about the evolution of life on Earth. This knowledge can also inspire new ideas for developing stronger materials and technologies that can handle hard bites.
Key Facts
- The placoderms were the first vertebrates to evolve jaws and teeth, over 400 million years ago.
- Researchers from Flinders University studied eight species of placoderms using a new finite element analysis technique.
- Smaller placoderms relied on broad, flat crushing plates to eat prey, while larger ones evolved weapon-like teeth.
- Both the largest and smallest placoderms had strong jaws for handling hard bites, despite using different biting tools.
- The discovery was made possible by a combination of computer simulations and 3D analysis of fossil jaw bones.
Key Terms
- Placoderms
- Ancient armored fish with jaws and teeth
- Finite Element Analysis
- A technique used to analyze the strength of materials under stress
Implications
Understanding how ancient fish evolved unique ways to eat prey can help us learn more about the evolution of life on Earth. This knowledge can also inspire new ideas for developing stronger materials and technologies that can handle hard bites.
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