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Revision of the genera Sphaerodinella Keupp and Versteegh, 1989 and Orthopithonella Keupp in Keupp and Mutterlose, 1984 (Calciodinelloideae, calcareous dinoflagellate cysts).
| Streng, M., Hildebrand-Habel, T. and Willems, H. | |
| 2002 | |
| Journal of Paleontology, v..76, p.397-407. | |
| Revision of the genera Sphaerodinella Keupp and Versteegh, 1989 and Orthopithonella Keupp in Keupp and Mutterlose, 1984 (Calciodinelloideae, calcareous dinoflagellate cysts). |
Streng, M., Hildebrand-Habel, T. and Willems, H., 2002: Revision of the genera Sphaerodinella Keupp and Versteegh, 1989 and Orthopithonella Keupp in Keupp and Mutterlose, 1984 (Calciodinelloideae, calcareous dinoflagellate cysts). Journal of Paleontology, v..76, p.397-407.