original descriptionHarger, O. (1872). Descriptions of new North-American Myriapods. American Journal of Science, 3(4): 117-121[details]
original description(ofFlagellopetalum Causey, 1951)Causey, N. B. (1951). New genera and species of chordeumoid millipeds in the United States, and notes on some established species. Proceedings of the Biological Society of Washington, 64: 117-124 page(s): 119 [details]
original description(ofTynopus Chamberlin, 1940)Chamberlin, R. V. (1940). On some chilopods and diplopods from North Carolina. Canadian Entomologist, 72: 56-59 page(s): 57 [details]
additional sourceShear, W. A. (2003). The milliped family Trichopetalidae, part 1: Introduction and genera Trigenotyla Causey, Nannopetalum n. gen., and Causeyella n. gen. (Diplopoda: Chordeumatida: Cleidogonoidea). Zootaxa, 321: 1-36. Auckland[details]
additional sourceShear, William Albert. (2010). The milliped family Trichopetalidae, Part 2: The genera Trichopetalum, Zygonopus and Scoterpes (Diplopoda: Chordeumatida, Cleidogonoidea). Zootaxa, 2385: 1-62[details]
additional sourceLoomis, H. F. (1966). Two new families and other North American Diplopoda of the suborder Chordeumidea. Proceedings of the Biological Society of Washington, 79: 221-230. Washington[details]