Rhagodiscus asper


Classification: Mesozoic -> Eiffellithales -> Rhagodiscaceae -> Rhagodiscus -> Rhagodiscus asper
Sister taxa: R. achlyostaurion, R. amplus, R. angustus, R. asper, R. cepekii, R. dekaenelii, R. infinitus, R. pseudoangustus, R. splendens, R. adinfinitus, R. gallagheri, R. indistinctus, R. pancostii, R. plebeius, R. robustus, R. sageri, R. eboracensis, R. hamptonii, R. reniformis, R. sp.,

Distinguishing features: Medium-sized (5-8µm) murolith coccoliths with a relatively broad central area spanned by a granular plate that normally bears a hollow spine or spine base; the rim appears unicyclic in LM.


Taxonomy:

Citation: Rhagodiscus asper (Stradner, 1963) Reinhardt, 1967
Rank: Species
Basionym: Discolithus asper Stradner, 1963
Variants: Considerable morphological variation is observed within this species, and this is reflected in the number of species names that have been applied to similar morphotypes that in many cases may be synonyms (e.g.
Synonyms:

Farinacci & Howe catalog pages: Discolithus asper * , Parhabdolithus reightonensis * , Rhabdolithina swinnertoni * , Discolithus vagus * , Parhabdolithus granulatus * , Zygolithus variradiatus * , Parhabdolithus fischeri * , Rhabdolithina excavata * , Rhabdolithina clavulus *

Distinguishing features: Medium-sized (5-8µm) murolith coccoliths with a relatively broad central area spanned by a granular plate that normally bears a hollow spine or spine base; the rim appears unicyclic in LM.


Morphology remarks: Often common.

Size: 5-8µm - larger specimens are placed in R. amplus and smaller in R. achylostaurion

Search data:
TagsLITHS: murolith, elliptical, CA: plate, pores, process, R-UNITS: R-prominent, DETAILS: rim-unicyclic,
MetricsLith size: 5->8µm;
Sources: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): near base of UC5b subzone (10% up, 94.2Ma, in Cenomanian stage). Data source: Burnett 1998, fig. 6.2
First occurrence (base): in upper part of NJT17a subzone (60% up, 145.9Ma, in Tithonian stage). Data source: Casellato 2010, fig16 - secondary marker

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: Rhagodiscus asper, synonyms included - Ahmuellerella asper; Discolithina asper; Discolithus asper; Parhabdolithus asper; Rhagodiscus asper; Rhagodiscus reightonensis; Rhagodiscus swinnertonnii; Zygolithus variradiatus;
  • space-time plot :: Samples map :: Parent: Rhagodiscus

    References:

    Black, M. (1971a). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs

    Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. Marine Micropaleontology. 52(1-4): 51-84. gs

    Bown, P. R. (2005c). 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

    Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

    Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

    Casellato, C. E. (2010). Calcareous nannofossil biostratigraphy of Upper Callovian - Lower Berriasian successions from the Souhern Alps, North Italy. Rivista Italiana di Paleontologia e Stratigrafia. 116(3): 357-404. gs

    Cepek, P. (1978). Mesozoic calcareous nannoplankton of the Eastern North Atlantic, Leg 41. Initial Reports of the Deep Sea Drilling Project. 41: 667-687. gs

    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

    Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs

    Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs

    Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs

    Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs

    Lambert, B. (1993). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional (Deuxième Partie). Cahiers de Micropaleontologie. 8(2): 183-225. gs

    Linnert, C., Mutterlose, J. & Erbacher, J. (2010). Calcareous nannofossils of the Cenomanian/Turonian boundary interval from the Boreal Realm (Wunstorf, northwest Germany). Marine Micropaleontology. 74: 38-58. gs

    Mutterlose, J. & Wise, S. W. (1990). Lower Cretaceous nannofossil biostratigraphy of ODP Leg 113 Holes 692B and 693A, continental slope off east Antarctica, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 325-351. gs

    Perch-Nielsen, K. (1972). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs

    Reinhardt, P. (1967). Fossile Coccolithen mit rhagoidem Zentralfeld (Fam. Ahmuellerellaceae, Subord. Coccolithineae). Neues Jahrbuch für Geologie und Paläontologie Monatshefte. 1967: 163-178. gs

    Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs

    Stover, L. E. (1966). Cretaceous coccoliths and associated nannofossils from France and the Netherlands. Micropaleontology. 12: 133-167. gs

    Stradner, H. (1963). New contributions to Mesozoic stratigraphy by means of nannofossils. Proceedings of the Sixth World Petroleum Congress. Section 1 Paper 4: 167-183. gs

    Stradner, H., Aubry, M. -P. & Bonnemaison, M. (2010). Calcareous nannofossil type specimens in the collection of the Geological Survey of Austria: A taxonomic and stratigraphic update. Jahrbuch der Geologischen Bundesanstalt. 150(1-2): 9-84. gs

    Taylor, R. J. (1978). The distribution of calcareous nannofossils in the Speeton Clay (Lower Cretaceous) of Yorkshire. Proceedings of the Yorkshire Geological Society. 42: 195-209. gs

    Watkins, D. K. & Bowdler, J. L. (1984). Cretaceous calcareous nannofossils from Deep Sea Drilling Project Leg 77, southeast Gulf of Mexico. Initial Reports of the Deep Sea Drilling Project. 77: 649-674. gs

    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

    Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs

    Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs

    Young, J. R. (2010). Calcareous nannofossils. In, Young, J. R. , Gale, A. S. , Knight, R. & Smith, A. B. (eds) Fossil of the Gault Clay. Palaeontological Association 16-27. gs


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    Rhagodiscus asper compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-4-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11017 Go to Archive.is to create a permanent copy of this page - citation notes



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