Massive fossilized structures known as Prototaxites have baffled scientists for over 165 years. Despite numerous attempts to categorize them, researchers in the UK suggest that these enigmatic organisms may belong to a branch of their own, with no modern equivalent.
Dating back around 400 million years, Prototaxites fossils were initially mistaken for rotting trees by geologist John William Dawson in the 1850s. However, subsequent studies have led to a more accurate classification: that of an enormous fungus. A 2017 study confirmed this finding using microscopic analysis and chemical composition.
However, a new review of three different Prototaxites fossils from the University of Edinburgh raises doubts about the fungus classification. The researchers found that the anatomy and chemistry of these ancient organisms are distinct from those of modern fungi, plants, algae, and even lichens. They conclude that Prototaxites is likely a member of an entirely new, extinct group of eukaryotes.
The mystery surrounding Prototaxites remains unsolved, leaving scientists to speculate about the evolution of this long-dead group of organisms. Further study may one day reveal more about these enigmatic fossils and their place in the natural world.
Source: https://www.sciencealert.com/mysterious-giants-may-be-a-whole-new-kind-of-life-that-no-longer-exists