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Proturan specimen (Acerentomon sp.)
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Hexapoda
Class: Entognatha

The Entognatha is a class of ametabolous arthropods, which, together with insects, makes up the superclass Hexapoda. Their mouthparts are entognathous, meaning they are retracted within the head. The class contains three orders: Collembola (springtails), Diplura and Protura.