Distinguishing features: Elliptical with unicyclic rim; central-area spanned by oblique transverse bar with two distal spikes
Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | Gephyrobiscutum diabolum Elliptical, unicyclic; distal shield sculpted; central-area with oblique transverse bar and two spikes. | |||
Gephyrobiscutum sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Gephyrobiscutum *
Distinguishing features: Elliptical with unicyclic rim; central-area spanned by oblique transverse bar with two distal spikes
Morphology: Austral biogeographic distribution, but rarely reported.
Tags | LITHS: placolith, elliptical, CA: ca_disjunct, process, bar, CROSS-POLARS: rim-unicyclic, V-prominent, |
Metrics | Lith size: 3->4.5µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Campanian Stage (100% up, 72.1Ma, in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Campanian Stage (0% up, 83.6Ma, in Campanian stage). Data source: Total of range 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 V O Wise, S. W. (1988). Mesozoic-Cenozoic history of calcareous nannofossils in the region of the Southern Ocean. Palaeogeography Palaeoclimatology Palaeoecology. 67: 157-179. gsReferences:
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Gephyrobiscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-2-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10472 Go to Archive.is to create a permanent copy of this page - citation notes |