The second, third, and fourth body segments bear a single pair of legs each and are known as "haplosegments", from the Greek haplo, "single" (the three haplosegments are sometimes referred to as a "thorax").
O segundo, terceiro e cuarto segmentos do corpo levan un só par de patas e denomínanse "haplosegmentos" (estes tres haplosegmentos ás veces denomínanse "tórax").).