Nannotax3 - ntax_cenozoic - Toweius serotinus

Citation: Toweius serotinus Bybell & Self-Trail, 1995

Synonyms: Toweius serontinus Bybell & Self-Trail, 1995 - this form of the name - serontinus - is sometime seen, it appears to be a mis-spelling [my interpretation - JRY 2016]

Taxonomic discussion: The epithet serotinus means late-flowering and presumably refers to the fact that this is one of the last Toweius species.

Morphology: Larger form of Toweius (>6µm) with wide birefringent central area filled by robust grill defining numerous pores in the central rea (13-19 res according to Bybell & Self-Trail 1995, 10-20 according to Bown 2005).

Phylogenetic relations: Evolves from T. tovae within NP9, according to Bybell & Self-Trail (1995, p.11)

Most likely ancestor: Toweius tovae - at confidence level 3 (out of 5). Data source: Bybell & Self-Trail (1995, p.11).

Geological Range:
Last occurrence (top): within NP10 zone (54.17-55.86Ma, top in Ypresian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: [PRB rough estimate]

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 V 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 V O

Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs V O

Bybell, L. M. & Self-Trail, J. (1995). Evolutionary, biostratigraphic and taxonomic study of calcareous nanofossils from a continuous Palaeocene-Eocene boundary section in New Jersey. U.S. Geological Survey, Professional Paper. 1554: 1-36. gs V O

Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs V O

Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs V O

Tags	LITHS: placolith, elliptical, CA: ca_conjunct, grill, pores, CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 5->8µm;

Toweius serotinus

References:

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