Retecapsa incompta


Classification: Mesozoic -> Podorhabdales -> Cretarhabdaceae -> Retecapsa -> Retecapsa incompta
Sister taxa: R. beckii, R. escaigii, R. surirella, R. crenulata, R. angustiforata, R. octofenestrata, R. schizobrachiata, R. incompta, R. ficula, R. sp.,

Distinguishing features: Small to medium sized retecapsids with axial cross bars that are broad and bright in XPL with median extinction lines. Distinctly bicyclic rim image in XPL.


Taxonomy:

Citation: Retecapsa incompta Bown, 1987
Rank: Species

Farinacci & Howe catalog pages: Retecapsa incompta *

Distinguishing features: Small to medium sized retecapsids with axial cross bars that are broad and bright in XPL with median extinction lines. Distinctly bicyclic rim image in XPL.


Morphology remarks: The earliest occurring cretarhabdid coccolith.

Geological Range:
Last occurrence (top): within Middle Oxfordian Substage (159.70-160.84Ma, top in Oxfordian stage). Data source: Bown & Cooper 1998
First occurrence (base): at base of NJ8a subzone (0% up, 174.6Ma, in Toarcian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event; Mattioli & Erba 1999, fig. 12 - zonal marker

Plot of occurrence data:

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

    References:

    Bown, P. R. & Cooper, M. K. E. (1989b). New calcareous nannofssils from the Jurassic. Journal of Micropalaeontology. 8: 91-96. gs

    Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

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

    Bown, P. R., Cooper, M. K. E. & Lord, A. R. (1988). A calcareous nannofossil biozonation scheme for the early to mid Mesozoic. Newsletters on Stratigraphy. 20: 91-114. gs

    Mattioli, E. & Erba, E. (1999). Synthesis of calcareous nannofossil events in Tethyan lower and middle Jurassic successions. Rivista Italiana di Paleontologia e Stratigrafia. 105(3): 343-376. gs


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    Retecapsa incompta compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-12-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11002 Go to Archive.is to create a permanent copy of this page - citation notes



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