When did the ancestors of mayflies first fly?

When did the ancestors of mayflies first fly?

• A. About 50 million years ago
• B. About 300 million years ago
• C. About 1 billion years ago
• D. About 10 million years ago

Answer: (B)

Flight in insects developed very early in their history. By roughly 300 million years ago, during the Carboniferous, fossils show winged insects and the lineages leading to primitive orders like mayflies had already evolved the ability to fly. This timing fits why mayflies are considered among the most ancient winged insect groups and helps explain their long, successful persistence.

Dates much later than that, like around 50 million years ago or 10 million years ago, would come after flight had already arisen and diversified in many insects. A date as early as about 1 billion years ago is before insects themselves had appeared, so it doesn’t match what we know from the fossil record.