Schweitzer, Carrie E., Rodney M. Feldmann, Hiroaki Karasawa, and Alessandro Garassino. 2015. “Treatise Online No. 67: Part R, Revised, Volume 1, Chapter 8H: Systematic Descriptions: Infraorder Achelata”. Treatise Online, August. https://doi.org/10.17161/to.v0i0.4987.