Orthozygus sudis


Classification: ntax_cenozoic -> Holococcoliths -> fossil holococcoliths -> Orthozygus -> Orthozygus sudis
Sister taxa: O. arcus, O. aureus, O. brytika, O. occultus, O. sudis, O. suggrandis, O. sp.

Taxonomy:

Citation: Orthozygus sudis Bown & Dunkley Jones, 2006
Rank: Species
Taxonomic discussion: The spine is taller and narrower than that of Orthozygus aureus, and has a relatively broad central cavity that is quite distinct from the spines of Zygrhablithus bijugatus. It also lacks the crystallographically distinct rim cycle of the latter.

Distinguishing features: Holococcolith that in side-view comprises a low basal coccolith and a relatively tall, hollow spine that tapers to a point. Both coccolith and spine are birefringent and crystallographically continuous in XPL.

Farinacci & Howe catalog pages: O. sudis *

Search data:
TagsLITHS: holococcolith, elliptical, hollow, CA: process, CROSS-POLARS: V-prominent,
MetricsLith size: 4->5µm;
Data source notes: lith size (height & width similar) from OD & extended slightly
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Bown & Dunkley Jones, 2006
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Bown & Dunkley Jones, 2006

Plot of occurrence data:

References:

Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. 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

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Orthozygus sudis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-4-2021

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