The Protura, or proturans, and sometimes nicknamed coneheads are an order of hexapods previously regarded as insects, and sometimes treated as a class in their own right. There is some evidence that the Protura are basal to all other hexapods, although hexapods are increasingly thought to be polyphyletic. They are very small (anamorphic development, whereby body segments are added during moults. Szeptycki (2007) lists a total of 731 described species worldwide, in seven families, nearly 300...
