Distinguishing features: Cavate holococcolith with internal walls and distal protrusions
| Daughter taxa: (blue => in age window 0-800Ma) | ||||
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| Specimens not identified to species level | ||||
Taxonomy:
Farinacci & Howe catalog pages: Tanzanella *
Distinguishing features: Cavate holococcolith with internal walls and distal protrusions
Morphology remarks: "Holococcoliths with a complex structure, as seen in side view. In XPL, rotated to 45 ̊, the rim and proximal plate are thin, birefringent and clearly visible. Encased within these is a blocky structure, from the distal surface of which emanate four ‘prongs’." [Lees 2007]
Geological Range:
Last occurrence (top): in upper part of Cenomanian Stage (83% up, 95Ma, in Cenomanian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Cenomanian Stage (66% up, 96.1Ma, in Cenomanian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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 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. gsReferences:
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Tanzanella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-8-2019
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