Mattiolia


Classification: Mesozoic -> Podorhabdales -> Cretarhabdaceae -> Mattiolia
Sister taxa: Cretarhabdus, Cruciellipsis, Flabellites, Grantarhabdus, Helenea, Mattiolia, Miravetesina, Pickelhaube, Retecapsa, Speetonia,

Short diagnosis: Cretarhabdids with a distinctly dark image in XPL. The type species has broadly elliptical shields and a narrow central area filled with a broad plate/axial cross; the plate is also dark under XPL but is crossed by at least four extinction lines.


Daughter taxa (blue => in age window 0-300Ma)
Medium-sized (~5.5 ┬Ám), broadly elliptical placoliths with a distinctly dark image in XPL and a central area equivalent in width to the shield. The central area is filled by a broad axial cross that may form a complete plate. The central area plate, like the shields, has a dark appearance under XPL but is crossed by at least four extinction lines, axially and diagonally orientated.
Specimens not identified to species level

Taxonomy:

Citation: Mattiolia Bown, 2005
Rank: Genus
Type species: Mattiolia furva Bown, 2005.

Farinacci & Howe catalog pages: Mattiolia *

Short diagnosis: Cretarhabdids with a distinctly dark image in XPL. The type species has broadly elliptical shields and a narrow central area filled with a broad plate/axial cross; the plate is also dark under XPL but is crossed by at least four extinction lines.


Morphology remarks: Other Cretaceous placolith coccoliths appear dark under XPL (e.g., Haqius and Repagulum), however, the rim outline, rim to central area proportions, and central area structures are quite different in Mattiolia furva.

Geological Range:
Last occurrence (top): within Albian Stage (100.50-112.95Ma, top in Albian stage). Data source: Total of range of species in this database
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R., (2005). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program. Scientific Results, 198: 1-82.


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

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