Distinguishing features: Very small species of Hughesius (<4µm), with 2 elongate plates in central-area, separated by transverse suture.
Original description: Diagnosis: Species of Hughesius with two elongated elements in the central area.
Description: This elliptical placolith has elongated two plates in the central area. When the species is aligned 45° to the polarizers, the elements of the shield become birefringent where the long axis of the plates touches the shield. In this respect it artificially resembles Cryptococcolithus biparteoperculata.
Farinacci & Howe catalog pages: H. youngii *Search data:
|Tags||LITHS: placolith, elliptical, CA: ca_disjunct, plate, closed, |
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
|Metrics||Lith size: 2->4µm;|
Last occurrence (top): within NN4 zone (14.91-17.95Ma, top in Langhian stage). Data source: da Gama & Varol 2013
First occurrence (base): within NN2 zone (19.00-22.82Ma, base in Aquitanian stage). Data source: da Gama & Varol 2013
Plot of occurrence data:
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