Irham, M. , F. R. Schram & R. Vonk (2010). A new species of Pygocephalomorpha (Eumalacostraca, Peracarida) from the Leitchfield formation, Lower Carboniferous (Mississipian) of Grayson County, Kentucky, U. S. A. Studies on Malacostraca: Lipke Bijdeley Hol
