Matsuoka et al., 1997
From dinoflaj3
Matsuoka, K., McMinn, A. and Wrenn, J.H., 1997: Restudy of the holotype of Operculodinium centrocarpum (Deflandre & Cookson) Wall (Dinophyceae) from the Miocene of Australia, and the taxonomy of related species. Palynology, v.21, p.19-33, pl.1-4.