Sphenolithus paleograndis
Set number: 904
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10µm
Sphenolithus paleograndis Varol, in prep.
Height: 10.0µm; width: 9.00µm
Similar to dome shape Sphenolithus moriformis (Brönnimann & Stradner, 1960) Bramlette & Wilcoxon, 1967 and Sphenolithus puniceus Bergen & de Kaenel in Bergen et al., 2017 but larger (>10.0µm). It has a clustered bouquet shape apical cycle and is only bearly distinguished from lateral cycles at 45° with the help of gypsum plate. The height of Sphenolithus paleograndis is slightly greater than its width.
Sphenolithus paleograndis differs from Sphenolithus moriformis, Sphenolithus puniceus and Sphenolithus abies Deflandre, 1953 ex Deflandre in Deflandre & Fert, 1954 by being large than 10.0µm. It is further distinguished from Sphenolithus abies by being dome shape and from Sphenolithus puniceus by being less birefringent.
Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E., Blair, S. A. , 2017. Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. - Journal of Nannoplankton Research 37(2-3), 145-175.
Bramlette, M. N., Wilcoxon, J. A., 1967. Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology 5, 93-131.
Brönnimann, P., Stradner, H., 1960. Die Foraminiferen- und Discoasteriden-zonen von Kuba und ihre interkontinentale Korrelation. Erdoel-Zeitschrift 76(10), 364-369.
Deflandre, G., 1953. Hétérogénéité intrinsèque et pluralité des éleménts dans les coccolithes actuels et fossiles. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris 237, 1785-1787.
Deflandre, G., Fert, C., 1954. Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie 40, 115-176.
Holotype
Sphenolithus paleograndis
Varol, in prep.
Late Oligocene
DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean