Gaarderella


Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Gaarderella
Sister taxa: Biscutum, Boletuvelum, Chiastella, Crucibiscutum, Discorhabdus, Gaarderella, Gephyrobiscutum, Helicorhabdus, Jimenezberrocosoia, Seribiscutum, Similiscutum, Sollasites,

Distinguishing features: Elliptical, large with broad shields; central area wide, spanned by a granular plate.


Daughter taxa: (blue => in age window 0-800Ma)
Large placolith with broad shields and wide central area spanned by a granular central-area plate.
Specimens not identified to species level

Taxonomy:

Citation: Gaarderella Black, 1973
Rank: Genus
Type species: Gaarderella granulifera Black, 1973.

Farinacci & Howe catalog pages: Gaarderella *

Distinguishing features: Elliptical, large with broad shields; central area wide, spanned by a granular plate.


Morphology remarks: The nature of the rim is uncertain because the type images are all proximal views, but they appear to by Sollasites-like. The use of the name for LM images is rather variable. Rarely reported.

Geological Range:
Last occurrence (top): at top of Albian Stage (100% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Albian Stage (0% up, 113Ma, in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs


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Gaarderella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-11-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10454 Go to Archive.is to create a permanent copy of this page - citation notes



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