Distinguishing features: elliptical, with axial ridges & 8-10 perforations; formed of 4 blocks with diagonal sutures
Farinacci & Howe catalog pages: H. lippertii *
Morphology: Small, elliptical, moderately-birefringent holococcolith crossed by roughly diagonal extinction lines in XPL delineating four blocks, which are birefringent at 0° and dark at 45°. There are around 8–10 perforations across the blocks and raised axial ridges are visible in phase contrast.
Differentiation: The perforations are smaller than Holodiscolithus solidus and less numerous than Holodiscolithus macroporus. [Bown & Newsam 2017]
Size: Holotype L = 3.2μm (Paratype L = 3.4μm).
|Tags||LITHS: holococcolith, elliptical, CA: pores, CROSS-POLARS: R-prominent,|
|Metrics||Lith size: 3->4µm; Segments: 4->4; |
Data source notes: lith size from OD & extended slightly
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP21 zone (32.92-34.44Ma, base in Priabonian stage). Data source: Bown & Newsam 2017
Plot of occurrence data:
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