The 45-million-year-old fungus gnat pictured, with all its features, is fully formed and flawless. A fungus gnat living 45 million years ago is identical to those living today. Not the slightest change has taken place over millions of years in the fungus gnat"s wings or flight systems, eyes and visual systems, or legs or any other of its physical structures. Fungus gnats were exactly the same 45 million years ago as they are today.