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 (time control age-window is: 0-800Ma) | ||||
 |  |  |  | Mazaganella protensa 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 pulla Mazaganella with three low, adpresssed shields and a central area spanned by a cruciform plate bearing a short hollow spine. |
| Mazaganella sp. Specimens not identified to species level | ||||
Taxonomy:
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: Tethyan distribution.
| Tags | LITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, process, CROSS-POLARS: rim-bicyclic, rim-unicyclic, V-prominent, |
| Metrics | Lith size: 5->8µm; Data source notes: size range of included species |
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:
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: 1-118. gsReferences:
 |
Mazaganella 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=10644 Go to Archive.is to create a permanent copy of this page - citation notes |