top of page
  • Denis Pepin

A Chinchilla-Sized Ancestor: Unveiling the Secrets of Militocodon lydae

hinchilla-like creature, the ancient kin of cows, frolicking among the fall foliage, a mere pound of prehistoric wonder.
Imagine a petite, chinchilla-like creature, the ancient kin of cows, frolicking among the fall foliage, a mere pound of prehistoric wonder. (CyberNesco)

The reign of the dinosaurs may have come to a crashing end 66 million years ago, but from the ashes rose a new era of dominance – the age of mammals. Understanding how these furry forerunners diversified and filled the ecological niches left vacant by the giants of the past is a captivating puzzle for paleontologists. A crucial piece of this puzzle has recently been unearthed in the form of a fascinating fossil – Militocodon lydae.


Imagine a creature the size of a chinchilla, scurrying through the undergrowth of a primeval forest. This is how paleontologists envision Militocodon lydae, a newly discovered species that sheds light on the early evolution of hoofed mammals like cows, deer, and pigs. Despite its unassuming size and rodent-like appearance, Militocodon lydae represents a significant leap forward in our understanding of mammalian diversification following the Cretaceous-Paleogene (K-Pg) extinction event.

In a study published on April 30th in the Journal of Mammalian Evolution, Dr. Tyler Lyson and his colleagues at the Denver Museum of Nature & Science documented the discovery of Militocodon lydae. The fossilized skull and jaws were unearthed at the Corral Bluffs site on the edge of Colorado Springs. This location is a treasure trove for palaeontologists, preserving rocks dating back to the Paleocene epoch, the earliest period of the Cenozoic Era that followed the dinosaur extinction.


The significance of Militocodon lydae lies in its belonging to the extinct family Periptychidae. Periptychids were a diverse group of archaic ungulates, also known as 'condylarths'. These early mammals were not quite hoofed animals in the modern sense, but they possessed features that would eventually lead to the evolution of the familiar herbivores we see today. Militocodon lydae, with its small size and likely omnivorous diet, represents a more primitive stage in this evolutionary lineage.


The discovery of Militocodon lydae is particularly valuable because the fossil record for the earliest Paleocene is often sparse. This period, roughly the first 10 million years following the K-Pg extinction, is crucial for understanding how mammals began to exploit the ecological opportunities opened up by the disappearance of the dinosaurs. Militocodon lydae, along with a handful of other recently discovered Paleocene mammals, helps to fill this gap in the fossil record.


By studying the anatomy of Militocodon lydae, palaeontologists can glean valuable insights into the early diversification of hoofed mammals. The creature's teeth, for instance, offer clues about its diet. While some features suggest it may have consumed insects and small animals, the presence of shearing blades on its molars also hints at the ability to process plant material. This adaptability may have been key to the success of Periptychids in the early Paleocene environment.


The small size of Militocodon lydae is another intriguing aspect. While some mammals did manage to survive the K-Pg extinction event by being small and burrowing, the early Paleocene also saw a trend towards larger body sizes. Militocodon lydae suggests that smaller-bodied mammals continued to thrive alongside their larger counterparts, occupying different ecological niches.


The discovery of Militocodon lydae has sparked excitement not only among paleontologists but also among the general public. The image of a chinchilla-like creature scurrying through the post-dinosaur world captures the imagination and underscores the remarkable diversity of life that has existed on Earth.

However, there's still much to learn about Militocodon lydae and its role in the grand scheme of mammalian evolution. Further research on its skeletal anatomy, potential predators, and the broader ecosystem of the Corral Bluffs site can provide even deeper insights. Additionally, the possibility of uncovering more fossils of Militocodon lydae or its close relatives in other locations could help to refine our understanding of this fascinating creature and the Periptychidae family as a whole.


In conclusion, the unassuming Militocodon lydae stands as a testament to the power of paleontological discoveries. This newfound species offers a glimpse into the early diversification of hoofed mammals, reminding us that the giants of the animal kingdom often have surprisingly small and unassuming ancestors. As paleontologists continue to analyze Militocodon lydae and other early Paleocene mammals, we can expect a clearer picture to emerge of how mammals rose to prominence in the wake of the dinosaur extinction, ultimately shaping the world we see today.


bottom of page