Nannotax3 - ntax_main - Scrippsiella fragments

Citation: Scrippsiella fragments

Taxonomic discussion: These have sometimes been referred to in the nannofossil literature as coccoliths of the genera Acanthoica or Anacanthoica.

Distinguishing features:
Parent taxon (Scrippsiella): Cysts with tangential wall structure and compound archaeopyles. Wall formed of largish non-intelocking elements each with a spine
This taxon: Isolated spine-bearing elements from Scrippsiella cysts

Scrippsiella shells characteristically are formed of a mosaic of single crystal plates each with a short triangular section spine, often terminated by a rhombic crystal. The calcite c-axis is perpendicular to the length of the spine. As the test breaks up these crystals may be found isolated or in small groups and they can easily be mistaken for small holococcoliths.

Neritic - Scrippsiella tests are a benthic resting stage

Geological Range:
Notes: Thes etest fragments have been illustrated rom throughout the Cenozoic and Late Cretaceous. The oldest occurrence documented here is from the Albian but they may well persist below this.
Last occurrence (top): Extant. Data source: present in the plankton
First occurrence (base): within Albian Stage (100.50-113.20Ma, base in Albian stage). Data source: Specimens illustrated here from Gault Clay, England

References:

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs O

Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs O

Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs

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

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

Mai, H. (2001). New coccolithophorid taxa fom the Guelhemmerberg airshaft. Lower Paleocene, The Netherlands. Micropaleontology. 47: 144-154. gs

Varol, O. (1989b). Eocene calcareous nannofossils from Sile (northwest Turkey). Revista Española de Micropaleontología. 21: 273-320. gs

Varol, O. (1989a). Calcareous nannofossil study of the central and western Solomon Islands. Circum-Pacific Council for Energy and Mineral Resources Earth Sciences. 239-268. gs

Scrippsiella fragments

References:

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