Mazaganella


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

Short diagnosis: 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 0-300Ma)
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 + *

Short diagnosis: 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): within Pliensbachian Stage (182.70-190.82Ma, top in Pliensbachian stage). Data source: Total of range of species in this database
First occurrence (base): within Sinemurian Stage (190.82-199.30Ma, base 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. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.

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

Bown, P.R., (1987). The structural development of Early Mesozoic coccoliths and its evolutionary and taxonomic significance. Abhandlung der Geologischen Bundesanstalt, 39: 33-49.


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Mazaganella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-1-2018

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