1. These sclerites are separated into two series by the pleural wing process.

2. It frequently unites with neighbouring sclerites, or it may be divided into a pair of plates.

3. Left right sclerite pairs are found which proves a bilaterally symmetrical body of the animal.

4. Each of these regions may be differentiated into separate sclerites.

5. The hypothesized function of subcostal brace in mayflies is to strengthen the connection between distantly separated longitudinal veins because of sclerite plate at radius vein base.