👉 A mycetozoan is a type of fossil fungus that emerged during the Mesozoic era, around 2.95 to 3.16 billion years ago. These fungi were characterized by their elongated and thickened bodies and their ability to form a complex network of branching structures known as mycelium. Mycetozones are often associated with marine environments and have been found in various parts of the world, including Australia, South America, and Asia. Myc