#aublysodon

[mesozoicmarket]

A rooted dinosaur tooth of a Nanotyrannus sp. from the Hell Creek Formation in Carter County, Montana, United States. This unserrated basal morphology was previously known as the tooth taxon, Aublysodon amplus. While unserrated premaxillary teeth were supposedly an ontogenetically variable character, proposed to be found in young Gorgosaurus, recent studies on Nanotyrannus by Zanno and Napoli 2025 have shown this may not be the case implying these cannot belong to immature Tyrannosaurus rex. Which may mean they belong to Nanotyrannus lancensis and Nanotyrannus lethaeus. I'm not sure what this means for unserrated tyrannosaur premaxillary teeth from older deposits like the Judith River or Two Medicine Formation. Do they represent an undescribed Nanotyrannidae indet., or at least, a more basal eutyrannosaur/pantyrannosaur of some kind?

[fundinofactoftheday]

Dinofact #106

Bistahieversor, a tyrannosauroid dinosaur, differs from other tyrannosaurs in that it possesses 64 teeth, an extra opening above the eye, a keel along the lower jaw, and a complex joint at its forehead, among other unique traits. The dinosaur, discovered in 1990, was originally thought to be an Aublysodon, then a new species of Daspletosaurus, before being assigned its own species, Bistahieversor sealeyi, in 2010.

Source: Wikipedia

[bolkasu]

Aublysodon

[a-dinosaur-a-day]

Aublysodon mirandus

By Ashley Patch on @palaeoshley

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Name: Aublysodon mirandus

Name Meaning: Backwards-Flowing Tooth

First Described: 1868

Described By: Leidy

Classification: Dinosauria, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Tyrannosauroidea, Tyrannosauridae, Tyrannosaurinae

Aublysodon is based on some juvenile tyrannosaur teeth from the Judith River Group in Montana, living in the Late Campanian of the Late Cretaceous, approximately 75 million years ago. Given it belongs to a juvenile tyrannosaur, it is probably just a representative of an already present genus - potentially Daspletosaurus, however, the teeth are poorly known and are now lost, so it can never be confirmed as a juvenile of that genus. So, we’re stuck with this existing, even though it’s almost definitely just a juvenile of a tyrannosaur we already have. 

Source:

https://en.wikipedia.org/wiki/Aublysodon

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[dinodorks]

Tyrannosaurid Skulls by Franz-Josef73

[triplejay34-blog]

When are scientists finally going to classify Aublysodon mirandus  as a junior synonym of Daspletosaurus or some other tyrannosaurid?