Loeblich Jr. and Wicander, 1976
From dinoflaj3
Loeblich, A.R. Jr. and Wicander, E.R., 1976: Organic-walled microplankton from the Lower Devonian Late Gedinnian Haragan and Bois d'Arc Formations of Oklahoma, U.S.A., Part 1. Palaeontographica, Abteilung B, v.159, no.1-3, p.1-39, pl.1-12.