original description(ofZygoceros tuomeyi J.W.Bailey, 1844)Bailey, J.W. (1844). Account of some new Infusorial forms discovered in the fossil Infusoria from Petersberg, Va., and Piscataway, Md. American Journal of Science, 46: 137-141, 1 pl. page(s): p. 138; pl. 3, fig. 3, 4 [details]
new combination referenceRoper, F.C.S. (1859). On the genus Biddulphia and its affinities. Transactions of the Microscopical Society of London, 7: 1-24, pl. 1 & 2. page(s): p. 8; pl. 1, fig. 1, 2 [details]