Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
| Zygrhablithus bijugatus Large rod-shaped holococcolith with small basal disk | Zygrhablithus bijugatus subsp. bijugatus Zygrhablithus bijugatus subsp. cornutus Zygrhablithus bijugatus subsp. crassus Zygrhablithus bijugatus subsp. maximus Zygrhablithus bijugatus subsp. nolfii Zygrhablithus bijugatus - low | ||||
| Zygrhablithus sileensis Cavate holococcolith with a base and hollow distal process with 4 arches. The process and most of the base are formed of four blocks, in addition a narrow rim surrounds the base. | |||||
| Zygrhablithus sp. Specimens which cannot be assigned to any established species | |||||
Distinguishing features:
Parent taxon (fossil holococcoliths): Holococcolith genera only known from the fossil record
This taxon: Spinose holococcoliths, which are birefringent in side view. In plan view the coccoliths are non-birefringent with a distinct figure-of-eight shaped central structure.
Farinacci & Howe catalog pages:
Zygrhablithus + * , Pseudozygrhablithus * , Sujkowskiella *
| LITHS: holococcolith, elliptical, CA: process, CROSS-POLARS: V-prominent, R-prominent, |
| Lith size: 5->16µm; Segments: 4->4; |
Geological Range:
Last occurrence (top): at top of NN1 zone (100% up, 22.8Ma, in Aquitanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP6 zone (58.97-59.54Ma, base in Selandian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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Zygrhablithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-6-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1529 Go to Archive.is to create a permanent copy of this page - citation notes |
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