INA16 Athens - September 2017

Syracosphaera tanzanensis


Ancestry: Coccolithophores -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> Syraco - fossil -> Syracosphaera tanzanensis
Sister taxa: N. franzii, S. sp. fossil, S. clathrata, S. croatica, S. fragilis, S. horvati, S. monechiae, S. octiforma, S. oneillii, S. raffiae, S. tanzanensis,

Short diagnosis: Medium sized, with narrow bicyclic rim (bright inner cycle, dark outer cycle) and wide central area.


Taxonomy:

Citation: Syracosphaera tanzanensis Bown, 2005
Rank: Species
Synonyms: 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.
Notes & discussion: Typical Syracosphaera structure seen in SEM, and large enough to be conspicuous in LM.

Farinacci & Howe catalog pages: Syracosphaera lamina de Kaenel and Villa * Syracosphaera tanzanensis *

Short diagnosis: Medium sized, with narrow bicyclic rim (bright inner cycle, dark outer cycle) and wide central area.


Morphology remarks: 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.

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:

References:

Bown, P.R., (2005). 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.

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.

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.

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Syracosphaera tanzanensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-8-2017

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Ines Galovic (Croatia)
The last SEM picture doesn't look like to represent diagnosed species. It is much smaller and has different developed central plate (not so wide central area) with spine.
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Jeremy Young (UCL, UK)
True - and in the original publication it is labelled as S. cf. S. tanzanensis - I will move this image to Syracosphaera sp.
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