Nannotax3 - ntax_mesozoic - Umbria

Umbria


Classification: ntax_mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Umbria
Sister taxa: Bucanthus, Calcivascularis, Crucirhabdus, Diductius, Mitrolithus, Parhabdolithus, Timorella, Umbria

Distinguishing features:
Parent taxon (Parhabdolithaceae): Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.
This taxon: Protolith coccoliths with low, sloping rim; central area wide filled by blocky laths


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Umbria granulosa
Narrow, gently-sloping protolith rim with wide central area spanned by a plate of blocky laths. XPL image is bicyclic.
Umbria granulosa subsp. granulosa
Umbria granulosa subsp. minor

Umbria sp.
Specimens not identified to species level

Taxonomy:

Citation: Umbria Bralower & Thierstein in Bralower et al., 1989
Rank: Genus
Type species: Umbria granulosa Bralower & Thierstein in Bralower et al., 1989

Farinacci & Howe catalog pages: Umbria *

Distinguishing features:
Parent taxon (Parhabdolithaceae): Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.
This taxon: Protolith coccoliths with low, sloping rim; central area wide filled by blocky laths


Morphology:


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: murolith, elliptical, CA: ca_disjunct, plate, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 4->10µm;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Berriasian Stage (100% up, 139.4Ma, in Berriasian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Tithonian Stage (62% up, 147.7Ma, in Tithonian 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. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O

Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs


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Umbria compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-12-2022

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11279 Go to Archive.is to create a permanent copy of this page - citation notes



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