Calcivascularis jansae


Classification: Mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Calcivascularis -> Calcivascularis jansae
Sister taxa: C. cassidyi, C. jansae, C. sp.,

Distinguishing features: Very tall, narrow, steeply sloping rim with a central area filled with a mass of radially arranged elements. Most commonly seen in side view.


Taxonomy:

Citation: Calcivascularis jansae Wiegand, 1984
Rank: Species
Synonyms: Mitrolithus irregularis Prins 1969 [invalid]
Mitrolithus jansae (Wiegand, 1984) Bown in Young et al., 1986 Eoconusphaera jansae
Notes & discussion: Initially described in it’s own genus Calcivascularis Wiegand, 1984, but transferred to Mitrolithus by Bown in Young et al. (1986) following work of Prins (1969) who suggested it was derived from M. elegans

Farinacci & Howe catalog pages: Calcivascularis jansae *

Distinguishing features: Very tall, narrow, steeply sloping rim with a central area filled with a mass of radially arranged elements. Most commonly seen in side view.


Morphology remarks: Has a distinctly tethyan biogeographic range but occassionally seen in boreal sections.

Geological Range:
Last occurrence (top): within NJ6 zone (180.49-181.63Ma, top in Toarcian stage). Data source: Bown & Cooper 1998; Mattioli & Erba 1999
First occurrence (base): in mid part of NJT2b subzone (50% up, 198.6Ma, in Sinemurian stage). Data source: Mattioli & Erba 1999, fig. 12

Plot of occurrence data:

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

    References:

    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. British Micropalaeontological Society Publication Series. 98-106. 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. (1987b). The structural development of Early Mesozoic coccoliths and its evolutionary and taxonomic significance. Abhandlungen der Geologischen Bundesanstalt. 39: 33-49. 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

    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

    Wiegand, G. E. (1984b). Two new genera of calcareous nannofossils from the Lower Jurassic. Journal of Paleontology. 58: 1151-1155. gs

    Young, J. R., Teale, C. T. & Bown, P. R. (1986). Revision of the stratigraphy of the Longobucco Group (Liassic, southern Italy); based on new data from nannofossils and ammonites. Eclogae Geologicae Helvetiae. 79(1): 117-135. gs


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

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