“The oldest well-known fossil hexapod is called Rhyniella praecursor, a collembolan from the Early Devonian age Rhynie Chert.”

“Mr. Carpenter also tells me that the collembolan, Isotoma littoralis, is a typical northern migrant.”

“Both the lepidopteran and the trichopteran branches are relatively long and share a common node, a different situation from the plecopteran and the collembolan branches.”