Hailing from the Wahweap Formation of the Grand Staircase in Utah, Lythronax, the “gore king,” is one of the more recently discovered North American tyrannosaurids. It is estimated to have been up to 8 metres in length and 2.5 tons in weight, making it comparable in size to the better known Albertosaurus and Gorgosaurus and significantly smaller than Tyrannosaurus rex, of course. Lythronax lived between 81.9 and 81.5 million years ago, which makes it the oldest known member of Tyrannosauridae.


The Dinosaur Toy Blog has already had reviews of Lythronax toys by CollectA and Creative Beast Studio. And now, courtesy of PNSO, we have Keynes. Released in 2023, he is sculpted in a striding pose with his left leg extended back in mid-step, his tail swaying to the left, his arms swept back, and his head angled upward and to the left. He stands just about 9 cm tall and is 26 cm long. The included support rod goes against his chest, although he stands very well without it.



Keynes’ base colour is, not surprisingly, light brown, with medium brown markings running down his neck, torso, and tail. Olive green is applied on his back and dull grey-brown is applied to his underbelly, arms, and feet. His claws are very dark grey. Warm brown patches are visible on the sides of his neck and skull. His orange eyes are surrounded by dark brown and the end of his muzzle is dark brown with off white wash. Finally, his mouth tissue is glossy pink and his teeth are tan. It’s a reasonably flashy colour scheme by PNSO standards, and it looks realistic.


Like other PNSO tyrannosaurs, Keynes’ skin is covered in teeny, tiny scales and complimented by a great many wrinkles, particularly on his neck and around his midsection.

Keynes’ feet have textured soles and rows of scutes. His limbs are bulging with muscle and his neck is super thick, much more so than on the similarly sized Tristan.



Keynes’ brow features thick postorbitals and raised cornual processes. The front of his snout is covered in the thick, cornified scales that are included on all top tier tyrannosaur toys nowadays. His hinged lower jaw opens to a 40 degree angle, giving us an excellent view of the interior of his mouth, from the tongue to the nostril holes. His teeth are satisfyingly sharp and, unfortunately, fully exposed to the elements. I really can’t wait for PNSO to put out more theropods with lips.

Lythronax can be distinguished by its robust build, which Keynes most definitely possesses. More importantly, it had only 11 teeth in its maxilla, which Keynes also possesses. And like T. rex, it had a particularly wide skull with forward facing eyes, as shown in the image below.

It’s also worth noting that, while Keynes isn’t the biggest of the PNSO tyrannosaurs, he’s certainly one of the most imposing. A tough and trucculent brute, fully capable of taking on prey the same size or larger than himself. The known contemporaries of Lythronax included the hadrosaurs Acristavus and Adelolophus, neither of which have toys yet, and the ceratopsids Diabloceratops and Machairoceratops, which do indeed have toys.

The accompanying poster is yet again something of a letdown in my eyes, as it’s simply an image of the toy instead of some original paleoart. Similarly, the first section of the booklet only contains more toy images and a diagram of the known fossil remains of Lythronax. The how-to-draw section has nice illustrations, though, and my older son appreciated the poster.


Keynes the Lythronax is a terrific toy. Easily superior to the CollectA version and certainly comparable to the larger Beasts of the Mesozoic one. You can find him for sale in numerous online stores. Here’s hoping that PNSO tackles Bistahieversor, Dynamoterror, and Teratophoneus in the future.

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