Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Entognatha is a class of ametabolous arthropods, which, together with insects, makes up the hexapods. Their mouthparts are entognathous, meaning they are retracted within the head. Entognatha are apterous, meaning they lack wings. The class contains three orders: Collembola (springtails), Diplura and Protura. These three groups were historically united with the order Thysanura to form the class Apterygota, but it has since been recognized that the hexapodous condition of these animals has evolved independently from that of insects, and independently within each order.

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