Orthozygus occultus


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

Taxonomy:

Citation: Orthozygus occultatusDunkley Jones, Bown & Pearson, 2009
Rank: Species

Distinguishing features: Medium sized, irregularly elliptical to polygonal holococcoliths, which are dark in XPL but have distinctly high relief in phase contrast. Central hole seen in LM is a perforate cover on the distal side.

Farinacci & Howe catalog pages: O. occultus *

Search data:
TagsLITHS: holococcolith, elliptical, hollow, CA: process, closed, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 3->6µm;
Data source notes: lith size from illustrated specs
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: Dunkley Jones et al., 2009
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Dunkley Jones et al., 2009

Plot of occurrence data:

References:

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

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

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Orthozygus occultus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2021

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