A New Ancient Crocodile Relative Found in a UK Quarry — And It Could Run

Ron Croucher pulled this fossil out of a quarry in Gloucestershire back in 1969 and handed it off to the Natural History Museum in London. For decades it sat in storage, loosely labelled as a possible specimen of Terrestrisuchus gracilis — a known species from nearby Wales. Nobody looked closely enough. Now, a team led by Ewan Bodenham at University College London has formally described it as an entirely new genus and species: Galahadosuchus jonesi. Published in The Anatomical Record in January 2026, the paper gives a name and a detailed anatomy to something that was sitting right there the whole time.

The Fossil That Sat in a Museum for Half a Century

The Bristol Channel region — straddling southwest England and south Wales — has been producing strange, small-bodied Triassic fossils from limestone fissure deposits for well over a century. These narrow rock cracks, filled with ancient sediment, have preserved an oddly diverse snapshot of life just before and after the end-Triassic mass extinction. Terrestrisuchus gracilis, found at Pant-y-Ffynnon Quarry in South Wales, was the only confirmed non-crocodyliform crocodylomorph from the region. Cromhall Quarry in Gloucestershire — about 30 kilometres away — had also yielded crocodylomorph bones over the years, but nobody could quite pin them down. Partly incomplete. Partly undiagnosed. The specimen now known as NHMUK PV R 10002 was the most promising of the lot, a semi-articulated partial skeleton, and it kept getting informally flagged as probably Terrestrisuchus. Probably.

Why Crocodile Ancestors Look Nothing Like Crocodiles

The Triassic crocodylomorphs are genuinely strange when you compare them to what the lineage eventually became. Galahadosuchus jonesi was probably around 40–50 centimetres long, slender, and upright — an erect-postured quadruped built for speed, not swimming. Its limbs were proportioned like a runner's. The team applied a statistical method that compares the relative thickness of limb bones across hundreds of living and extinct animals, and the results put Galahadosuchus squarely in the quadrupedal category — though, interestingly, slightly closer to the bipedal end of the spectrum than its close relative Terrestrisuchus. What that means functionally is still debated. The wrist bones — specifically the radiale and ulnare — are short and stocky compared to Terrestrisuchus, which may mean a more flexible wrist, which in turn could reflect a different gait or perhaps different terrain preferences. These are exactly the kinds of subtle differences that get paleontologists talking.

How Did Scientists Know This Was a New Species?

This is where it gets genuinely interesting. At first glance, Galahadosuchus looks a lot like Terrestrisuchus. The tail vertebrae, the hip bones, the shoulder girdle — broadly similar. So why not just call it another specimen of the same species? The answer is in the details of bones that most people would walk past without a second look. The wrist carpals are notably stubbier. The radiale — one of the small bones between the wrist and forearm — has a deep groove running the full length of its back surface in Galahadosuchus, while in Terrestrisuchus that groove is shallow and confined to the upper third. The humerus has a different shape at its proximal end. The calcaneum, the heel bone, is proportionally stockier. Metacarpal V is shorter. Taken individually, each difference might be dismissed as variation within a species. Together they add up to something distinct. The team also ran a full maximum parsimony phylogenetic analysis that consistently places the new specimen as the sister taxon to Terrestrisuchus — related, but separate.

What This Fossil Tells Us About Early Reptile Diversity

The name Galahadosuchus jonesi carries a nice double meaning. "Galahad" from Arthurian legend — a knight known for uprightness — references the animal's upright posture. The species name honours David Rhys Jones, a science teacher in Aberteifi, Wales, who apparently inspired lead author Bodenham to pursue science in the first place. The broader point, though, is what this discovery says about the fissure faunas of the Bristol Channel. These deposits already gave us Terrestrisuchus and a surprising range of early mammals and reptiles. Finding a second crocodylomorph species — one that shared the same general region and roughly the same time period — suggests that even closely related animals within this group were developing different locomotory styles. Early crocodylomorph evolution was not a single straight line toward the aquatic predator we know today. There was experimentation. Variety. Two species filling similar but perhaps subtly different ecological roles within a few dozen kilometres of each other, both walking upright on a landscape that would eventually be swallowed by the end-Triassic extinction event.

The Questions Still Unanswered

The honest caveat here is that NHMUK PV R 10002 has no skull. None preserved, none recovered. The skull is generally where the richest morphological information sits in early crocodylomorphs, so what's described here is based entirely on postcranial material — the body skeleton below the neck. The team is frank about this: a future study with better phylogenetic character sampling is needed before the sister-group relationship to Terrestrisuchus can be stated with full confidence. The age of the Cromhall deposits is also still contested — estimates range from Carnian to Rhaetian, a window spanning perhaps 30 million years of the Triassic. Getting a tighter date would help clarify whether these two species were genuinely contemporaneous. The CT scan data are publicly archived, so other researchers can dig into the bones themselves.

• Old fossils, new names — Specimens collected decades ago and sitting in museum collections are still yielding entirely new species when studied with modern methods.
• Crocodile ancestors ran upright — The earliest crocodylomorphs bore little resemblance to modern crocodilians; they were slender, fast, and fully terrestrial, an evolutionary path that only reversed much later.
• Subtle bone differences matter — The distinction between Galahadosuchus and Terrestrisuchus comes down to wrist carpal proportions, heel bone shape, and humerus morphology — evidence that closely related species can diverge in locomotory specialisation without obvious outward differences.

"The description of Galahadosuchus underscores the value of reappraising the taxonomy of understudied museum specimens." — Bodenham et al., The Anatomical Record, 2026.