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# Lizzie the Fossil Reptile Was Hiding a Set of Gills
- URL: https://www.gottabekidding.me/lizzie-the-fossil-reptile-was-hiding-a-set-of-gills/
- Published: 2026-10-22T10:04:00.000Z
- Updated: 2026-10-22T10:03:59.000Z
- Description: Claws were supposed to mean an animal lived on land. A gilled swimmer broke that rule, and some very old footprints may need new owners.
- Author: Out of Bounds
- Tags: History

X-rays fired through two crushed slabs of Scottish rock found gills made of bone and a fishy mouth crowded with thousands of minute teeth. They belong to Lizzie, an animal that lived 345 million years ago and spent decades as a poster child for early reptiles.

Lizzie, formally Westlothiana lizziae, turned up in 1984 and earned her nickname with a lizard-ish look. Researchers described her in 1990, working mostly from what showed on the rock's surface: four limbs, plus fingers and toes ending in tips that resembled claws. That was enough. She became the go-to example of the earliest land-ready amniote, the group that takes in reptiles, mammals and birds.

A team from Oxford and the American Museum of Natural History then took the slabs to Grenoble, France, where the European Synchrotron Radiation Facility's X-rays looked through stone to anatomy nobody had laid eyes on. Out came an old-fashioned skull plus the bony gills and that crowded mouth. Those features rule her out as a reptile ancestor. The study, published in Nature, places her in a far older lineage and suggests she lived in water or moved between water and land.

Her claws and five-digit hands and feet, long filed as land-animal gear, were already present in earlier, water-loving cousins of the four-limbed crowd, the team concludes.

That loose end travels. Clawed trackways have been used to argue that amniotes were walking around over 359 million years back. If Lizzie had claws, claw marks alone can't prove who left those prints. Some may belong to more primitive animals that split time between water and land.

She keeps the nickname. The lizard resemblance turned out to be skin deep, an odd thing to say about a fossil.

**Read the full story at** [Phys.org, September 30, 2026](https://phys.org/news/2026-09-fossil-world-oldest-reptile-dethroned.html?ref=gottabekidding.me)

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**Hot Take:** Every gym has a guy in full Ironman kit who has never finished the run. Lizzie had the claws and the five toes, and she still kept the gills.