A new Eocene genus of ant-like stone beetles sheds new light on the evolution of Mastigini

Fossil Scydmaeninae beetles are exceptionally poorly known and those described usually lack important details to reliably analyze their phylogenetic relationships with extant taxa. Baltostigus n. gen. is the first extinct ant-like stone beetle taxon unambiguously assigned to the tribe Mastigini. It includes B . antennatus n. sp. (the type species of Baltostigus ) and B . horribilis n. sp., from the lower to middle Eocene amber of Poland and...