Peanut seeds from the Tatú Vermelho cv. were classified by size through screens 18, 20 and 22, and the control not classified. After were passed in a specific gravity separator and separed in three density classes (light, medium and heavy) for every screen. Subsequently were submitted to a sand emergence test and, evaluated the 100 seed weight, the seedling heigth and the seedling dry weight. The density and size of seeds affected its physiological quality, and the classification