Nannotax3 - ntax_mesozoic - Prinsiosphaera triassica

Prinsiosphaera triassica


Classification: ntax_mesozoic -> Mesozoic non–coccoliths -> Prinsiosphaera -> Prinsiosphaera triassica
Sister taxa: P. triassica, P. sp.

Distinguishing features:
Parent taxon (Prinsiosphaera): Spherical, solid nannolith formed from stacked groups of calcite plates.
This taxon: Medium to large spherical solid nannolith formed from stacked groups of calcite plates.


Sub-taxa & variants (time control age-window is: 0-800Ma)
Prinsiosphaera triassica subsp. crenulata
In LM appears to be formed of crenulate layers.

Taxonomy:

Citation: Prinsiosphaera triassica Jafar, 1983
Rank: Species
Synonyms:
Variants: Jafar (983) introduced five subspecies, these are discussed at length by Bralower et al. (1991) who conclude they are intergradational and of limited value. However, one of them, Prinsiosphaera triassica crenulata, has subsequently been considered a useful taxon (Rutledge et al. 2015). The remaining four subspecies are still considered preservational variants:

Taxonomic discussion:
The species is discussed at length by Bralower et al. (1991). According to them etching and overgrowth can greatly effect the appearance of the species - and lead to the various morphotypes recognised as subspecies by Jafar (1983).

Farinacci & Howe catalog pages: P. triassica * , P. triassica punctata * , P. triassica perforata * , P. triassica hyalina * , P. triassica noeliae *

Distinguishing features:
Parent taxon (Prinsiosphaera): Spherical, solid nannolith formed from stacked groups of calcite plates.
This taxon: Medium to large spherical solid nannolith formed from stacked groups of calcite plates.

Search data:
TagsLITHS: nannolith-other, circular, hollow,
MetricsLith size: 5->10µm;
Data source notes: original descriptions & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Gardin et al. (2012) record P. triassica from the topmost Norian and throughout the Rhaetian
Last occurrence (top): within NT2b subzone (201.10-218.91Ma, top in Hettangian stage). Data source: Bown 1998b
First occurrence (base): within NT2a subzone (218.91-222.89Ma, base in Norian stage). Data source: Bown 1998b

Plot of occurrence data:

References:

Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs

Bown, P. R. (1998b). Triassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 29-33. gs

Bralower, T. J., Bown, P. R. & Siesser, W. (1991). Significance of Upper Triassic nannofossils from the Southern Hemisphere (ODP Leg 122, Wombat Plateau, NW Australia). Marine Micropaleontology. 17: 119-154. gs

Gardin, S., Krystyn, L., Richoz, S., Bartolini, A. & Galbrun, B. (2012). Where and when the earliest coccolithophores? Lethaia. 45: 507-523. gs

Jafar, A. S. (1983). Significance of Late Triassic calcareous nannoplankton from Austria and Southern Germany. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 166: 218-259. gs

Rutledge, D. C., Cole, S., Lawrence, T. & Gard, G. (2015). A new species of late Triassic nannofossil, Botulus triassicus, and observations on Triassic assemblages from the NW Shelf of Australia. In, Bybell, L. (ed.) INA15 abstracts Bohol, Philippines. Journal of Nannoplankton Research. 35(special issue): 71-71. gs V O


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Prinsiosphaera triassica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-12-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10949 Go to Archive.is to create a permanent copy of this page - citation notes



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