Mazaganellaceae

Daughter taxa (time control age-window is: 0-800Ma)					Granddaughter taxa
				Mazaganella 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.	Mazaganella protensa Mazaganella pulla Mazaganella sp.
				Triscutum Three-shielded placoliths with a wide central-area spanned by a proximal net or grill.	Triscutum beaminsterensis Triscutum expansus Triscutum pricatillus Triscutum sullivanii Triscutum tiziense Triscutum sp.

Taxonomy:

Distinguishing features:
Parent taxon (Podorhabdales): Placolith (or modified placolith) coccoliths showing little or no imbrication. Typically, V-units form distal shield, R-units form proximal shield.
This taxon: Three-shielded placoliths; central-area wide, spanned by bars, grill, net or plate.
The distal shield may be high and flaring, formed from non-imbricating elements, joined along radial sutures. LM image is generally dark, but birefringence increases when the distal shield is high.

Original description: Diagnosis. Coccoliths which possess a rim composed of three shields, the elements of each shield displaying very little or no imbrication and joined along radial or near radial sutures; the distal shield may be vertically extended. The central area si wide and may be filed with a variety of crossbars and grills.

LM characteristics. Large dark shields in p-c with constituent elements usually visible. Dark to grey in c-p. The three-shielded structure is occasionally seen in side view.

Farinacci & Howe catalog pages: Mazaganellaceae *

Morphology:

Geological Range:
Last occurrence (top): at top of Middle Oxfordian Substage (100% up, 156.6Ma, in Oxfordian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Sinemurian Stage (192.90-199.46Ma, base in Sinemurian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Podorhabdales

Mazaganellaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10648 Go to Archive.is to create a permanent copy of this page - citation notes

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