Similiscutum orbiculus

Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Similiscutum -> Similiscutum orbiculus
Sister taxa: S. avitum, S. cruciulus, S. finchii, S. novum, S. orbiculus, S. precarium, S. sp.,

Distinguishing features: Small (3.5-5 µm), subcircular to circular, with narrow to closed central-area.


Citation: Similiscutum orbiculus de Kaenel & Bergen, 1993
Rank: Species

Farinacci & Howe catalog pages: Similiscutum orbiculus *

Distinguishing features: Small (3.5-5 µm), subcircular to circular, with narrow to closed central-area.

Search data:
TagsLITHS: placolith, circular, CA: vacant, closed, V-UNITS: V-prominent, DETAILS: rim-unicyclic,
MetricsLith size: 3.5->5µm;
Sources: Mattioli et al. 2004
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Toarcian Substage (178.24-182.70Ma, top in Toarcian stage). Data source: de Kaenel & Bergen 1993
First occurrence (base): within NJ5a subzone (184.03-185.53Ma, base in Pliensbachian stage). Data source: de Kaenel & Bergen 1993

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Similiscutum


    de Kaenel, E. & Bergen, J. A. (1993). New Early and Middle Jurassic coccolith taxa and biostratigraphy from the eastern proto-Atlantic (Morocco, Portugal and DSDP Site 547B). Eclogae Geologicae Helvetiae. 86(861-907): -. gs :: view :: open

    Mattioli, E., Pittet, B., Young, J. R. & Bown, P. R. (2004a). Biometric analysis of Pliensbachian-Toarcian (Lower Jurassic) coccoliths of the family Biscutaceae: intra- and interspecific variability versus palaeoenvironmental influence. In, Villa, G. , Lees, J. A. & Bown, P. R. (eds) Calcareous Nannofossil Palaeoecology and Palaeocenographic Reconstructions, Proceedings of the INA9 conference, Parma 2002. Marine Micropaleontology. 52(1-4): 5-27. gs :: ::

    Menini, A., Mattioli, E., Spangenberg, J. E., Pittet, B. & Suan, G. (2018). New calcareous nannofossil and carbon isotope data for the Pliensbachian/Toarcian boundary (Early Jurassic) in the western Tethys and their paleoenvironmental implications. Newsletters on Stratigraphy. -. gs :: ::


    Similiscutum orbiculus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-8-2020

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