 Females of the Chilean species, "Chiloe micropteron", have their wings reduced to tiny bristles.Most fossil species are known from the Taimyr amber of Russia and Canadian amber, but one species, "Baeomorpha liorum" is known from the Burmese amber.Rotoitids are very close to the base of the chalcidoid family tree, presently considered to be the first "branch" taxon after the Mymaridae.