Perissocyclus tayloriae


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

Distinguishing features: Large podorhabdid (generally >10µm) with multiple cycles of small perforations, separated by birefringent bars. These perforations are visible in XPL, but only the outer cycle is well enough defined to be easily counted and contains at least 16 perforations (16, 18, and 20 have been observed). The central spine may be supported by buttresses.


Taxonomy:

Citation: Perissocyclus tayloriae Crux, 1989
Rank: Species

Farinacci & Howe catalog pages: Perissocyclus tayloriae *

Distinguishing features: Large podorhabdid (generally >10µm) with multiple cycles of small perforations, separated by birefringent bars. These perforations are visible in XPL, but only the outer cycle is well enough defined to be easily counted and contains at least 16 perforations (16, 18, and 20 have been observed). The central spine may be supported by buttresses.


Morphology remarks: Slightly more restricted sense than Crux's (1989) diagnosis in order to differentiate P. plethotretus.

Geological Range:
Last occurrence (top): within Early Barremian Substage (129.41-130.77Ma, top in Barremian stage). Data source: Bown et al. 1998
First occurrence (base): within Late Hauterivian Substage (130.77-133.09Ma, base in Hauterivian stage). Data source: Bown et al. 1998

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:

    Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

    Crux, J. A. (1989). Biostratigraphy and palaeogeographical applications of Lower Cretaceous nannofossils from north-western Europe. In, Crux, J. A. & Heck, S. E. v. (eds) Nannofossils and their applications. British Micropalaeontological Society Publication Series. 143-211. gs

    Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 192: 221-253. gs


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    Perissocyclus tayloriae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-10-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10888 Go to Archive.is to create a permanent copy of this page - citation notes



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