A.  Chagas-Jr. and Shelley, R. M., ?The centipede genus Newportia Gervais, 1847, in Mexico: description of a new troglomorphic species; redescription of N. sabina Chamberlin, 1942; revival of N. azteca Humbert & Saussure, 1869?, Zootaxa, vol. 379, no. 1, pp. 1-20, 2003.

R. M.  Shelley, ?A new polydesmid milliped genus and two new species from Oregon and Washington, U. S. A., with a review of Bidentogon Buckett and Gardner, 1968, and a summary of the family in Western North America (Polydesmida: Polydesmidae)?, Zootaxa, vol. 296, p. 1, 2003.