Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | Braarudosphaera bigelowii Pentaliths pentagonal with sraight edges and flat top surface | |||
Braarudosphaera insecta pentaliths large & with crenulate edges | ||||
Braarudosphaera magnei Pentaliths rounded, and overlapping irregularly on coccosphere | ||||
Braarudosphaera pentagonica Braarudosphaera with 5-sided segments | ||||
Braarudosphaera perampla Large (>12µm) pentaliths with slightly rounded corners and convex upper surfaces | ||||
Braarudosphaera perversus Braarudosphaera with ridge along the longer edge of each segment, giving rotated stellate appearance. | ||||
![]() | ![]() | Braarudosphaera sequela Stellate Braarudosphaera with protruding pentalith segments. | ||
![]() | ![]() | ![]() | ![]() | Braarudosphaera stylifera Elevated pentaliths that taper sharply from the base. |
Braarudosphaera sp. Specimens which cannot be assigned to established species |
Taxonomy:
Distinguishing features: Pentaliths approximately pentagonal, sutures go to edges of pentagon.
Farinacci & Howe catalog pages: Braarudosphaera * , Quinquerhabdus * , Eodiscoaster *
Morphology: Pentaliths approximately pentagonal, sutures go to edges of pentagon. NB In Micrantholithus sutures go to vertices of the pentagon.
Tags | LITHS: |
Metrics | Lith size: 2->21µm; Segments: 5->5; Coccosphere size: 4->42µm; Liths per sphere: 12->12 |
Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Cenomanian Stage (0% up, 100.5Ma, in Cenomanian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs Bukry, D. & Bramlette, M. N. (1969b). Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology. 7: 131-142. gs V O Deflandre, G. (1947a). Braarudosphaera nov. gen., type d'une famille nouvelle de Coccolithophorides actuels a elements composites. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris. 225: 439-441. gs V O Martini, E. (1961). Nannoplankton aus dem Tertiär und der obersten Kreide von SW-Frankreich. Senckenbergiana Lethaea. 42: 1-32. gs Martini, E. (1971a). Die Typen und Typoide des Natur-Museums Senckenberg, 46): Fossiles Nannoplankton. Senckenbergiana Lethaea. 52: 115-127. gs Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gsReferences:
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Braarudosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-2-2021
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