Similiscutum


Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Similiscutum
Sister taxa: Biscutum, Boletuvelum, Chiastella, Crucibiscutum, Discorhabdus, Gaarderella, Gephyrobiscutum, Helicorhabdus, Jimenezberrocosoia, Seribiscutum, Similiscutum, Sollasites,

Short diagnosis: Subcircular-elliptical with smooth, grey appearance in XPL and a narrow, bright inner-cycle; central-area narrow and may be empty or spanned by an axial cross.


Daughter taxa (blue => in age window 0-300Ma)
Small, elliptical, biscutacean placolith with narrow to closed central-area.
Small, broadly elliptical, biscutacean placolith with narrow central area spanned by a small axial cross.
Small, subcircular to circular, biscutacean placolith with narrow to closed central-area.
Small to medium-sized, normally elliptical, biscutacean placolith with narrow central area spanned by a small axial cross.
Specimens not identified to species level

Taxonomy:

Citation: Similiscutum de Kaenel & Bergen, 1993
Rank: Genus
Type species: Similiscutum cruciulus de Kaenel and Bergen, 1993.

Farinacci & Howe catalog pages: Similiscutum + *

Short diagnosis: Subcircular-elliptical with smooth, grey appearance in XPL and a narrow, bright inner-cycle; central-area narrow and may be empty or spanned by an axial cross.

Geological Range:
Last occurrence (top): within Toarcian Stage (174.15-182.70Ma, top in Toarcian stage). Data source: Total of range of species in this database
First occurrence (base): within Sinemurian Stage (190.82-199.30Ma, base in Sinemurian 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. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.

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).


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

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