original description
Causey, N. B. (1960). The troglobitic milliped genus Zygonopus (Chordeumida, Conotylidae, Trichopetalinae). Journal of the New York Entomological Society, 68: 69-80
page(s): 75 [details]
additional source
Hoffman, R. L. (1999). Checklist of the millipedes of North and Middle America. <em>Virginia Museum of Natural History, special publication.</em> 8: 1-584.
page(s): 239 [details]
From editor or global species database