Perissocyclus liesbergensis


Classification: Mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Perissocyclus -> Perissocyclus liesbergensis
Sister taxa: P. fenestratus, P. liesbergensis, P. noeliae, P. plethotretus, P. tayloriae, P. sp.,

Distinguishing features: Small to medium (4-7 µm) mid Jurassic species. Typically with inner cycle of 4 large pores and outer cycle of 16-18 small pores - but this maybe reduced. 


Taxonomy:

Citation: Perissocyclus liesbergensis Grün & Zweili 1980
Rank: Species
Variants:
Notes & discussion: Grun & Zweili (1980) placed their specimens in several species, leading in some cases to very long range extensions. Here I have placed all the specimens they illustrated in P. liesbergensis, on he basis thatthe number of pores in this type of central structure is likely to be variable within species. [my interpretation - JRY 2020]

Farinacci & Howe catalog pages: Perissocyclus liesbergensis * , Octopodorhabdus oculisminutis *

Distinguishing features: Small to medium (4-7 µm) mid Jurassic species. Typically with inner cycle of 4 large pores and outer cycle of 16-18 small pores - but this maybe reduced. 


Size: 6.4-8.4 µm long

Search data:
TagsLITHS: placolith, CA: pores, process, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 4->7µm;
Sources: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Oxfordian Substage (160.84-163.47Ma, top in Oxfordian stage). Data source: original description
First occurrence (base): within Early Oxfordian Substage (160.84-163.47Ma, base in Oxfordian stage). Data source: original description

Plot of occurrence data:

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

    References:

    Grün, W. & Zweili, F. (1980). Das kalkige Nannoplankton der Dogger-Malm-Grenze im Berner Jura bei Liesberg (Schweiz). Jahrbuch der Geologischen Bundesanstalt. 123: 231-341. gs :: ::


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    Perissocyclus liesbergensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-7-2020

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10884 Go to Archive.is to create a permanent copy of this page - citation notes



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