Have you ever wonder what is the oldest-know insect? The oldest-know insect is INDIANAPOLIS. It was discovered in the 1920's. In the analysis the insect is 400 million years old. DNA evidence suggests insects originated about 434 million years ago. It was discovered by an Australian scientist in 1928. Would you like to see this insect? Why? I would like to but it may be a little gross! What do you think?