307-Million-Year-Old Fossil Reveals Early Plant-Eating Land Vertebrate
The discovery of Tyrannoroter heberti in Nova Scotia provides evidence of one of the earliest known herbivorous land vertebrates, dating back 307 million years.
A 307-million-year-old fossil unearthed in Nova Scotia, Canada, has been identified as one of the earliest known plant-eating land vertebrates. The creature, named Tyrannoroter heberti, was approximately the size of an American football and exhibited specialized dental features indicative of herbivory.
The fossil, discovered within a fossilized tree stump on Cape Breton Island, consists of a partial skull and mandible. High-resolution micro-CT scans revealed a robust skull with a downturned snout and large chambers for powerful jaw muscles. Notably, the mouth contained opposing dental fields on the palate and lower jaw, forming dental batteries suited for processing tough plant material.
Arjan Mann, assistant curator of fossil fishes and early tetrapods at the Field Museum in Chicago and co-lead author of the study, stated that Tyrannoroter is the earliest and most complete vertebrate land herbivore to show adaptations for processing high-fiber plant material.
The genus name Tyrannoroter translates to "tyrant digger," reflecting its relatively large size for its time and presumed burrowing behavior. The species name heberti honors Brian Hebert, the avocational paleontologist who discovered the skull.
This discovery suggests that vertebrate animals adapted to herbivory more rapidly than previously thought, indicating that early land ecosystems included plant-eating vertebrates much earlier in evolutionary history.