W. A. Shear, “The milliped family Trichopetalidae, Part 1: Introduction and Genera Trigenotyla Causey, Nannopetalum n. gen., and Causeyella n. gen. (Diplopoda: Chordeumatida, Cleidogonoidea)”, Zootaxa, vol. 321, no. 1, pp. 1–36, Oct. 2003.