Discorhabdus biradiatus


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

Distinguishing features: Discorhabdus with gaps between distal shield elements


Taxonomy:

Citation: Discorhabdus biradiatus (Worsley, 1971) Thierstein, 1973
Rank: Species
Basionym: ?Rucinolithus biradiatus Worsley, 1971
Synonyms: Bidiscus canthus Wilcoxon (1972) [this seems to be very similar and was described from the same time interval, Early Cretaceous, as most recorded specimens - JRY 2015]

Farinacci & Howe catalog pages: Rucinolithus biradiatus * , Bidiscus canthus *

Distinguishing features: Discorhabdus with gaps between distal shield elements

Search data:
TagsLITHS: placolith, circular, CA: process, V-UNITS: V-prominent, DETAILS: rim-unicyclic,
MetricsLith size: 4->5µm;
Sources: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Recorded from the Late Jurassic in the original description but from Early Cretaceous by Theirstein (1973) and in illustrated specimens here. The holotype came from DSDP Leg1 Site 4 and according to Bukry & Bramlette (1969) the basal core in the site
Last occurrence (top): within Barremian Stage (126.30-130.77Ma, top in Barremian stage). Data source: Thierstein 1973
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Thierstein 1973

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Discorhabdus biradiatus, synonyms included - Discorhabdus biradiatus;
  • space-time plot :: Samples map :: Parent: Discorhabdus

    References:

    Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348. gs :: view :: open

    Bown, P. R. (2005). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs :: view :: open

    Bukry, D. & Bramlette, M. N. (1969). Coccolith age determinations Leg 1, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 1: 369-387. gs :: view :: open

    Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs :: view :: open

    Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs :: view :: open

    Wilcoxon, J. A. (1972). Upper Jurassic-Lower Cretaceous calcareous nannoplankton from the Western North Atlantic Basin. Initial Reports of the Deep Sea Drilling Project. 11: 427-457. gs :: view :: open

    Wind, F. H. & Cepek, P. (1979). Lower Cretaceous calcareous nannoplankton from DSDP Hole 397A (northwest African Margin). Initial Reports of the Deep Sea Drilling Project. 47A: 221-235. gs :: view :: open

    Worsley, T. R. (1971). Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In, Farinacci, A. (ed.) Proceedings of the Second Planktonic Conference Roma 1970. Edizioni Tecnoscienza, Rome 2: 1301-1321. gs :: ::


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    Discorhabdus biradiatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10388 Go to Archive.is to create a permanent copy of this page - citation notes



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