Toweius magnicrassus


Classification: ntax_cenozoic -> Isochrysidales -> Prinsiaceae -> Toweius -> Toweius magnicrassus
Sister taxa: T. serotinus, T. pertusus, T. tovae, T. eminens, T. occultatus ⟩⟨ T. reticulum, T. selandianus, T. rotundus, T. patellus, T. callosus, T. magnicrassus ⟩⟨ T. gammation ⟩⟨ T. sp.

Taxonomy:

Citation: Toweius magnicrassus (Bukry, 1971) Romein, 1979
Rank: Species
Basionym: Coccolithus magnicrassus Bukry, 1971

Distinguishing features: Large to very large (8-15 µm); broadly elliptical to subcircular; central area narrow. Shields are moderately birefringent and tube cycle is highly birefringent.

Farinacci & Howe catalog pages: C. magnicrassus *


Size: According to original description 16-20 microns; however Romein (1979) suggested size range of 10-16 µm and subsequently illustrated specimens have been in this range. Likewise Wei et al. (1993) gave a size range of 8-14.5 µm, with a smaller size at high altitudes (8-11 µm) than at low latitudes (9.5-14.5 µm). This is still the largest known Toweius species.

Most likely ancestor: Toweius callosus - at confidence level 3 (out of 5). Data source: Wei et al. 1993 - fig.6 and discussion.

Search data:
TagsLITHS: placolith, circular, elliptical, CA: ca_conjunct, vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 8->16µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP14 zone (46.29-49.11Ma, top in Lutetian stage). Data source: Perch-Nielsen 1985b
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

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

Bukry, D. (1971b). Cenozoic calcareous nannofossils from the Pacific Ocean. San Diego Society of Natural History Transactions. 16: 303-327. gs

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

Pospichal, J. J. & Wise, S. W. (1990c). Paleocene to Middle Eocene calcareous nannofossils of ODP sites 689 and 690, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 613-638. gs V O

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. 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

Wei, W., Liu, L. & Bukry, D. (1993). Reappraisal of three calcareous nannofossil species: Coccolithus crassus, Toweius magnicrassus, and Toweius callosus. Journal of Micropalaeontology. 12(1): 91-98. gs V O


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Toweius magnicrassus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1417 Go to Archive.is to create a permanent copy of this page - citation notes



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