Distinguishing features: High, cylindrical morphology with a peg-like distal cycle; possibly the isolated central part of Cyclagelosphaera deflandrei specimens which have lost the shields.
| Daughter taxa: (blue => in age window 0-800Ma) | ||||
| | | | High, cylindrical morphology with a peg-like distal cycle; possibly the isolated central part of Cyclagelosphaera deflandrei specimens which have lost the shields. |
| Specimens not identified to species level | ||||
Taxonomy:
Farinacci & Howe catalog pages: Bibreviconus *
Distinguishing features: High, cylindrical morphology with a peg-like distal cycle; possibly the isolated central part of Cyclagelosphaera deflandrei specimens which have lost the shields.
Search data:| Tags | LITHS: placolith, circular, elliptical, cylindrical, CA: closed, R-UNITS: R-prominent, DETAILS: rim-unicyclic, |
| Metrics | Lith size: 3->5µm; Sources: size range of included species |
Geological Range:
Last occurrence (top): at top of Tithonian Stage (100% up, 145Ma, in Tithonian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Tithonian Stage (0% up, 152.1Ma, in Tithonian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs :: :: Rahman, A. & Roth, P. H. (1991). Upper Jurassic calcareous nannofossils from the DSDP Site 534 in the Blake Bahama Basin, western North Atlantic. Eclogae Geologicae Helvetiae. 84: 765-789. gs :: view :: openReferences:
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Bibreviconus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-8-2020
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