Prototaxites – a New Possible Kingdom of Life

We had always thought that Earth had no more than five kingdoms of life. (Kingdoms are one of the most general classifications of organisms.) But then there were also the prototaxites. Scientists had long since been debating whether the prototaxites belonged to the kingdom Plantae or Fungi. Though most scientists were leaning towards the kingdom Fungi, the prototaxites still had scientists stumped, since they had many similarities to Fungi, but important key features.

What key features, you ask? Well, Fungi contain certain polymers that the prototaxites did not have, some examples of those polymers being chitin and chitosan. Another prominent reason could be the distinct chemical composition of these organisms. Instead of the chitinous cell walls present in Fungi, prototaxites contained components similar to lignin and other unknown compounds. Perhaps the most obvious reason (to scientists, I mean) was the structure of the prototaxites. The tubes in prototaxites branch out and intersect in a complex way, something that is very unlike Fungi.

The fossils the scientists studied were found in the same area as other Fungi fossils, and many of their characteristics were still intact, which presents the idea that prototaxites are not Fungi, since if they were, they would have the Fungi characteristics still preserved. The absence of those characteristics, even though the prototaxites were very well preserved, supports the idea of prototaxites being a new biological kingdom even more.

But why is this discovery so important? Originally, it was believed that trees were the first truly complex organisms, but since the discovery of the well-preserved prototaxite fossils, that claim has been disproven. The fossils date back to between 350 and 420 million years ago, even before the first tree sprouted. One of the most studied species of prototaxite is Prototaxite loganii, which can grow up to nine meters tall.

The scientific world is full of discovery, and we really know very little. It is thought that we have only identified about 10 – 20% of the species on Earth, so there are close to infinite possibilities. It is not at all inaccurate to assume that there are still more different biological kingdoms out there, extinct or alive.

                      What is your favorite organism? (Not gonna say animal because that would be inaccurate) Comment down below!

Resources:

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

https://www.cnn.com/2026/02/05/science/prototaxites-fossil-analysis-unknown-life-form

https://www.science.org/doi/10.1126/sciadv.aec6277#:~:text=The%20field%20now%20faces%20two,and%20application%20of%20novel%20techniques.