Distinguishing features:
Parent taxon (Retecapsa): Cretarhabdids with central area spanned by an axial cross with lateral bars.
This taxon: Cretarhabdids with axial cross bars that are broad and bright in XPL with median extinction lines. Distinctly bicyclic rim image in XPL.
Taxonomy:
Farinacci & Howe catalog pages: R. incompta *
Distinguishing features:
Parent taxon (Retecapsa): Cretarhabdids with central area spanned by an axial cross with lateral bars.
This taxon: Cretarhabdids with axial cross bars that are broad and bright in XPL with median extinction lines. Distinctly bicyclic rim image in XPL.
Morphology:
LITHS: placolith, elliptical, CA: cross-axial, process, ca_disjunct, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic, |
Lith size: 5->8µm; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): within Middle Oxfordian Substage (156.60-159.40Ma, top in Oxfordian stage). Data source: Bown & Cooper 1998
First occurrence (base): at base of NJ8a subzone (0% up, 179.5Ma, in Toarcian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event; Mattioli & Erba 1999, fig. 12 - zonal marker
Plot of occurrence data:
Bown, P. R. & Cooper, M. K. E. (1989a). Conical nannofossils in the Mesozoic. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 98-106. gs 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 O Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. 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 Rahman, A. & Roth, P. H. (1992). New calcareous nannofossil taxa of Jurassic and early Cretaceous age from the Oka River region in Central Russia. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 184: 251-277. gsReferences:
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Retecapsa incompta compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-4-2025
Short stable page link: https://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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Comments (2)
Dear Jeremny,
I found the original description of R. incompta in Bown & Cooper, 1989b (page 92)(New calcareous nannofssils from the Jurassic. Journal of Micropalaeontology. 8: 91-96).
I checked both publications made by Bown in 1987 and Retecapsa is not mentioned.
So the citation would be: Retecapsa incompta Bown & Cooper, 1989
Kind regards,
Mica
Hi Michaela
Thank you for pointing out that mistake -and I have corrected it now. Please do let me know if you spot any more mistakes or omissions.
Jeremy