Thomas, M. J., J. Skejo, and S. W. Heads. “The Last Batrachideine of Europe: A New Genus and Species of Pygmy Grasshopper (Orthoptera: Tetrigidae) from Eocene Baltic Amber”. Zootaxa, vol. 4686, no. 3, Oct. 2019, pp. 435–445, doi:10.11646/zootaxa.4686.3.9.