Nannotax3 - ntax_main - Braarudosphaera bigelowii

Variant: Braarudosphaera bigelowii - Cretaceous is regarded here as a variant of Braarudosphaera bigelowii.
I.e. It is a subjective junior synonym, but some workers many find it useful for some studies (e.g. experienced biostratigraphers working with abundant, well preserved material), but for most purposes differentiating it is not reccomended. Please do use the comments section at the bottom of this page if you wish to discuss this interpretation

Citation: Braarudosphaera bigelowii (Gran & Braarud, 1935) Deflandre, 1947

Basionym: Pontosphaera bigelowii Gran & Braarud, 1935

Synonyms:

Micrantholithus lidiae Górka 1957 - very poor description but appears to be poorly preserved B. bigelowii

Variants:

Braarudosphaera imbricata Manivit 1966
Braarudosphaera bigelowi imbricata Bukry 1969

Although separately described both names refer to forms with imbricate elements.

Taxonomic discussion: The species was described from the modern plankton, but almost identical specimens occur in the Cretaceous so the same name is applied.

Distinguishing features:
Parent taxon (Braarudosphaera bigelowii): Pentaliths pentagonal with sraight edges and flat top surface
This taxon: Cretaceous specimens of Braarudosphaera bigelowii

See also: Braarudosphaera bigelowii - Cenozoic page, this is one of the very few species to occur commonly in both the Mesozoic and Cenozoic;

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Burnett 1998

References:

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

Deflandre, G. (1947a). Braarudosphaera nov. gen., type d'une famille nouvelle de Coccolithophorides actuels a elements composites. Comptes rendus hebdomaire de l'Académie des sciences, Paris. 225: 439-441. gs

Górka, H. (1957). Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica. 2: 239-284. gs

Gran, H. H. & Braarud, T. (1935). A quantitative study of the phytoplankton in the Bay of Fundy and the Gulf of Maine (including observations on hydrography, chemistry and turbidity). Journal of the Biological Board of Canada. 1: 279-467. gs

Lees, J. A. & Schueth, J. (2020). Taxonomic note – New Upper Cretaceous nannofossil taxa from the Turonian of New Mexico, USA. Journal of Nannoplankton Research. 38(1): 81-82. gs

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs O

Linnert, C., Mutterlose, J. & Erbacher, J. (2010). Calcareous nannofossils of the Cenomanian/Turonian boundary interval from the Boreal Realm (Wunstorf, northwest Germany). Marine Micropaleontology. 74: 38-58. gs

Manivit, H. (1966). Sur quelques coccolithes nouveaux du Néocomien. Compte Rendu Sommaire des Séances de la Société Géologique de France. 7: 267-268. gs

Perez-Rodriguez, I., Lees, J. A., Larasoaña, J. C., Arz, J. A. & Arenillas, I. (2012). Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain. Cretaceous Research. 37: 100-126. gs

Püttmann, T. & Mutterlose, J. (2019). Calcareous nannofossils from a Late Cretaceous nearshore setting. Journal of Nannoplankton Research. S4: 81-88. gs

Salomon, R. (1999). The Calcite Palace. Website - https://ina.tmsoc.org/galleries/CalcitePalace/index.htm. -. gs

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs O

Braarudosphaera bigelowii - Cretaceous

References:

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