The first Mesozoic japygid (Hexapoda: Diplura), Ferrojapyx vivax gen. et sp
. nov., is described from the Lower Cretaceous (Aptian) Crato Formation of
north-east Brazil. There are only two previously described occurrences of j
apygids in the fossil record: in Miocene or Pliocene onyx marble from Arizo
na and from the Carboniferous (Westphalian D) Francis Creek Shale of Mazon
Creek, Illinois.