Fortey, Richard A., John H. Shergold, S. R. A. Kelly, Robert M. Owens, and H. B. Whittington. 1997. “Part O, Arthropoda 1 (Revised), Vol. 1, Ch. 3, P. 249-329”. Treatise on Invertebrate Paleontology, January. https://doi.org/10.17161/dt.v0i0.5613.