Mazaganella

Distinguishing features:
Parent taxon (Mazaganellaceae): 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.
This taxon: 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:
Parent taxon (Mazaganellaceae): 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.
This taxon: 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:

Geological Range:
Last occurrence (top): at top of Pliensbachian Stage (100% up, 184.2Ma, in Pliensbachian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Late Sinemurian Substage (192.90-196.30Ma, 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. See also: customisable plot Parent: Mazaganellaceae

Mazaganella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-10-2024 Taxon Search: Advanced Search 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

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