Discorhabdus criotus


Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Discorhabdus -> Discorhabdus criotus
Sister taxa: D. biradiatus, D. corollatus, D. criotus, D. hannibalis, D. ignotus, D. patulus, D. striatus, D. watkinsii, D. sp.,

Distinguishing features: Discorhabdus with a narrow, distal inner cycle, narrow/closed central area and distal shield sutures that kink near the shield's outer edge. Bicyclic rim image.


Taxonomy:

Citation: Discorhabdus criotus Bown, 1987
Rank: Species
Synonyms: Biscutum criotum

Farinacci & Howe catalog pages: Discorhabdus criotus *

Distinguishing features: Discorhabdus with a narrow, distal inner cycle, narrow/closed central area and distal shield sutures that kink near the shield's outer edge. Bicyclic rim image.

Geological Range:
Last occurrence (top): within NJ15a subzone (158.53-160.84Ma, top in Oxfordian stage). Data source: Bown & Cooper 1998
First occurrence (base): in mid part of NJ7 zone (50% up, 177.5Ma, in Toarcian stage). Data source: Bown & Cooper 1998 (fig. 4) - secondary events

Plot of occurrence data:

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

    References:

    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

    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


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    Discorhabdus criotus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-10-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10390 Go to Archive.is to create a permanent copy of this page - citation notes



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