SCHRADER, Hans-Joachim 1974 (Oct.) Cenozoic marine planktonic diatom stratigraphy of the tropical Indian Ocean Initial Rep. Deep Sea Drilling Project 24: 887-967, incl. 22 pls., 13 figs., 5 tables [incl. Cussia n.g., n.spp. in Cussia, Nitzschia, Roperia, Thalassiosira, Thalassiothrix]