Crucirhabdus primulus


Classification: Mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Crucirhabdus -> Crucirhabdus primulus
Sister taxa: C. minutus, C. primulus, C. prinsii, C. sp.,

Distinguishing features: Crucirhabdus with relatively low, narrow rim and wide central area spanned by axial cross bars. Additional lateral bars may be present, probably dependent on preservation state. A tall, hollow spine rises from the centre of the cross bars.


Taxonomy:

Citation: Crucirhabdus primulus Prins 1969 ex Rood et al., 1973, emend Bown, 1987
Rank: Species
Synonyms:

Farinacci & Howe catalog pages: Crucirhabdus primulus + * , Apertius dorei * , Crucirhabdus primulus primulus [no catalog entry yet], Crucirhabdus primulus nanus [no catalog entry yet], Crucirhabdus primulus striatulus [no catalog entry yet]

Distinguishing features: Crucirhabdus with relatively low, narrow rim and wide central area spanned by axial cross bars. Additional lateral bars may be present, probably dependent on preservation state. A tall, hollow spine rises from the centre of the cross bars.

Geological Range:
Last occurrence (top): in mid part of NJ5b subzone (50% up, 182.8Ma, in Toarcian stage). Data source: Bown & Cooper 1998 fig. 4 - secondary events
First occurrence (base): within NT2b subzone (201.10-218.91Ma, base in Norian stage). Data source: Bown 1998

Plot of occurrence data:

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

    References:

    Barnard, T. & Hay, W. W. (1974). On Jurassic coccoliths: A tentative zonation of the Jurassic of Southern England and North France. Eclogae Geologicae Helvetiae. 67(3): 563-585. 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. (1998b). Triassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 29-33. gs

    Crux, J. A. (1987b). Early Jurassic calcareous nannofossil biostratigraphic events. Newsletters on Stratigraphy. 17: 79-100. gs

    Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Documents de Géologie de la Faculté des Sciences de Lyon. 75: 33-57. gs

    Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gs

    Menini, A., Mattioli, E., Spangenberg, J. E., Pittet, B. & Suan, G. (2018). New calcareous nannofossil and carbon isotope data for the Pliensbachian/Toarcian boundary (Early Jurassic) in the western Tethys and their paleoenvironmental implications. Newsletters on Stratigraphy. -. gs

    Prins, B. (1969). Evolution and stratigraphy of cocolithinids from the Lower and Middle Lias. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International conference on Planktonic Microfossils, Geneva 1967. E. J. Brill, Leiden 547-558. gs

    Rood, A. P., Hay, W. W. & Barnard, T. (1973). Electron microscope studies of Lower and Middle Jurassic coccoliths. Eclogae Geologicae Helvetiae. 66: 365-382. gs


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    Crucirhabdus primulus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10334 Go to Archive.is to create a permanent copy of this page - citation notes



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