Syracosphaera tanzanensis
Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> Syraco - fossil -> Syracosphaera tanzanensis
Sister taxa: N. franzii, S. clathrata, S. croatica, S. fragilis, S. horvati, S. monechiae, S. octiforma, S. oneillii, S. raffiae, S. tanzanensis, S. sp. fossil
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Taxonomy:
Citation: Syracosphaera tanzanensis Bown, 2005Rank: SpeciesSynonyms: Syracosphaera lamina of de Kaenel & Villa, 1996, - this species is invalid since it is a homonym of the extant species Syracosphaera lamina Lecal-Schlauder, 1951. The illustrated specimens however appear very similar to S. tanzanenis.Taxonomic discussion: Typical Syracosphaera structure seen in SEM, and large enough to be conspicuous in LM.
Distinguishing features: Medium sized, with narrow bicyclic rim (bright inner cycle, dark outer cycle) and wide central area.
Farinacci & Howe catalog pages: S. tanzanensis * , S. lamina de Kaenel and Villa *
Morphology: Muroliths with a typical Syracosphaera structure, with a high rim, narrow radial lath cycle, broad central plate formed of fused elements and a central spine. The relatively thick and high rim produces the distinct bright cycle in XPL.
Search data:
| Tags | LITHS: murolith, elliptical, CA: ca_disjunct, grill, process, CROSS-POLARS: rim-bicyclic, R-prominent, T-prominent, |
| Metrics | Lith size: 4->6µm;
Data source notes: lith length from OD & illustrated specimens |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Last occurrence (top): within Early Miocene Sub-Epoch (15.97-23.03Ma, top in Burdigalian stage). Data source: de Kaenel & Villa 1996 (as S. lamina)
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Dunkley Jones et al., 2009
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Syraco - fossil
References:
Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O
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 V O
Bown, P. R., Lees, J. A. & Young, J. R. (2017). On the Cretaceous origin of the Order Syracosphaerales and the genus Syracosphaera. Journal of Micropalaeontology. 36(2): 153-165. gs V O
de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs V O
Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs
Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 30(1): 57-79. gs V O
