antennal sockets exposed

Antennal sockets entirely exposed, not covered even partially by frontal lobes. In Antkey, separates the species of Amblyoponinae and Cerapachyinae from those of Ectatomminae, Myrmicinae and Ponerinae. The antennal sockets of Antkey species in the Dolichoderinae, Formicinae and Pseudomyrmecinae are also always at least partially covered.