Mazaganella


Classification: Mesozoic -> Podorhabdales -> Mazaganellaceae -> Mazaganella
Sister taxa: Mazaganella, Triscutum,

Distinguishing features: Three-shielded placoliths with a wide central-area spanned by a variety of bars, grills, nets or plates. The distal shield may be high and flaring. The distal shield is formed from non-imbricating elements, joined along radial sutures. LM image is generally dark, but birefringence increases when the distal shield is high.


Daughter taxa: (blue => in age window 0-800Ma)
Mazaganella with a narrow rim, elevated distal shield, distinct inner cycle and a central area axial cross that bears a hollow spine. Bicyclic rim image in XPL.
Mazaganella with three low, adpresssed shields and a central area spanned by a cruciform plate bearing a short hollow spine.
Specimens not identified to species level

Taxonomy:

Citation: Mazaganella Bown, 1987
Rank: Genus
Type species: Mazaganella pulla Bown, 1987

Farinacci & Howe catalog pages: Mazaganella + *

Distinguishing features: Three-shielded placoliths with a wide central-area spanned by a variety of bars, grills, nets or plates. The distal shield may be high and flaring. The distal shield is formed from non-imbricating elements, joined along radial sutures. LM image is generally dark, but birefringence increases when the distal shield is high.


Morphology remarks: Tethyan distribution.

Geological Range:
Last occurrence (top): at top of Pliensbachian Stage (100% up, 182.7Ma, in Pliensbachian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Sinemurian Stage (47% up, 195.3Ma, in Sinemurian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 118-. gs


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Mazaganella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-12-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10644 Go to Archive.is to create a permanent copy of this page - citation notes



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