Formiciinae
The Formiciinae is a very small fossil subfamily (Type and only genus is Formicium.). The genus Formicium includes at this moment 5 species and is known only from queens and males. Workers were never found. The wingspan of the sexuals is the biggest among ants (Extant and extinct combined.) ever found. The queens have a maximum wingspan of 13 to 15 cm. Real giants (One of the species is called F. giganteum.)! Two of the species are known from queens and males (Both from an Eocene deposit in Messel, Germany.) and the others are only known from isolated wings (Great Britain and U.S.A.). It is suspected that more species can be found in Messel and nearby deposits.