Ancient, Armored Fishes Crushed Jaw Evolution
Placoderms evolved unique approaches to the first-ever vertebrate jaws The post Ancient, Armored Fishes Crushed Jaw Evolution appeared first on Nautilus .
Placoderms, ancient armored fishes, revolutionized jaw evolution, developing distinctive jaw and dental structures to process a variety of diets. A study from Flinders University in Australia analyzed eight placoderm species from the 385-million-year-old Gogo fossil formation in western Australia. Researchers utilized micro-CT and surface scanning technology to create 3D models of the jaw fossils, which were then used to simulate the bite mechanisms and forces of these ancient creatures.
The findings revealed that placoderms exhibited varying jaw stiffness and dental complexity, with the smallest and largest species developing unique solutions for processing harder foods. The smallest placoderm, Rolfosteus canningensis, possessed smooth, flat dental plates ideal for crushing smaller prey, while the largest placoderm, Kimberleyichthys sp., featured a bony crest with raised, tooth-like structures resembling a medieval war hammer or poleaxe.
This specialized jaw structure likely facilitated the penetration and crushing of hard-shelled prey, allowing the creature to break it into smaller, more manageable pieces. The study suggests that placoderms played a crucial role in the ecological specialization during the Devonian period, contributing to the transition from fish to human-like vertebrates.
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