At this time, the end of the sixth millennium and the fifth millennium BC, the first Neolithic cultural groups appear in Egypt. The quantity of archaeological finds does not yet allow us to trace the merging of the Epipaleolithic traditions of the Nile Valley with the cultures of immigrant groups.
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plastron. the film of air covering parts of the body in aquatic insects such as water beetles, which enables them to stay under water. The film acts as a gill since gas exchange takes place between the water and the air bubble (plastron respiration). the horny bridge connecting the sides of the carapace below the body of tortoises and turtles. plastron