Calcivascularis


Classification: Mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Calcivascularis
Sister taxa: Bucanthus, Calcivascularis, Crucirhabdus, Diductius, Mitrolithus, Parhabdolithus, Timorella, Umbria,

Distinguishing features: Protolith coccoliths with high rim, inner rim cycle not clearly developed, upper part of coccolith filled by mass of radiating elements.


Daughter taxa: (blue => in age window 0-800Ma)
Small Calcivascularis with a high number of rim elements, sub-parallel walls, and a circular horizontal outline.
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 Wiegand 1984
Rank: Genus
Type species: Calcivascularis jansae Wiegand, 1984

Farinacci & Howe catalog pages: Calcivascularis *

Distinguishing features: Protolith coccoliths with high rim, inner rim cycle not clearly developed, upper part of coccolith filled by mass of radiating elements.


Evolution & Phylogeny: Prins 1969 suggested evolution of M. irregularis (=C. jansae) from Mitrolithus irregularis. Bown & Cooper 1989 noted similarities with Conusphaera and Eoconusphaera.

See also: Eoconusphaeraceae - nannolith group with similarities;

Geological Range:
Last occurrence (top): at top of Kimmeridgian Stage (100% up, 152.1Ma, in Kimmeridgian stage). Data source: Total of range of species in this database
First occurrence (base): near base of Sinemurian Stage (9% up, 198.5Ma, in Sinemurian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bergen, J. A., Boesiger, T. M. & Pospichal, J. J. (2014). Low-latitude Oxfordian to Early Berriasian nannofossil biostratigraphy and its application to the subsurface of Eastern Texas. In, Hammes, U. & Gale, J. (eds) Geology of the Haynesville Gas Shale in East Texas and West Louisiana, U.S.A. AAPG Memoir. 105: 69-102. gs

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

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 compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10160 Go to Archive.is to create a permanent copy of this page - citation notes



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