Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
| Cribrocorona echinus One cycle regular, the other appears to be a hemispherical mass of spines | ||||
| Cribrocorona gallica Both cycles regular, grill in central area. | ||||
| Cribrocorona sp. Specimens not identified to species level. | ||||
Distinguishing features:
Parent taxon (Axopodorhabdaceae): Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM
This taxon: Subcircular with very high rim; central-area narrow, with grill.
| LITHS: placolith, circular, cylindrical, hollow, CA: ca_disjunct, grill, vacant, closed, CROSS-POLARS: rim-unicyclic, R-prominent, |
| Lith size: 4->10µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within UC11c subzone (85.30-85.84Ma, base in Coniacian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O Perch-Nielsen, K. (1973). Neue Coccolithen aus dem Maastrichtien von Danemark, Madagaskar und Agypten. Bulletin of the Geological Society of Denmark. 22: 306-333. gs References:

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Cribrocorona compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-10-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10305 Go to Archive.is to create a permanent copy of this page - citation notes |
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