Smaller than a Microraptor!

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Protura sketch

The Protura, or proturans (sometimes nicknamed "coneheads") are very small (<2 mm long), soil-dwelling animals, so inconspicuous they were not noticed until the 20th century. The Protura constitute an order of hexapods that were previously regarded as insects, and sometimes treated as a class in their own right. Some evidence indicates the Protura are basal to all other hexapods, although not all researchers consider them Hexapoda, rendering the monophyly of Hexapoda unsettled. They are primitive land-living arthropods that first appeared during the Devonian period, with close to 800 species surviving and existing today.