Biscutum ellipticum


Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Biscutum -> Biscutum ellipticum
Sister taxa: B. constans, B. ellipticum, B. coronum, B. dekaenelii, B. magnum, B. melaniae, B. arrogans, B. asymmetricum, B. boletum, B. dissimilis, B. zulloii, B. hattneri, B. notaculum, B. virginica, B. gaultensis, B. thurowii, B. davyi, B. depravatus, B. dorsetensis, B. dubium, B. erismatum, B. grande, B. intermedium, B. planum, B. profundum, B. sp.,

Distinguishing features: Similar to B. constans.


Taxonomy:

Citation: Biscutum ellipticum (Górka, 1957) Grün in Grün and Allemann, 1975
Rank: Species
Basionym: Tremalithus ellipticus Górka, 1957
Synonyms:
Notes & discussion: This name is used in a similar sense to Biscutum constans (Górka, 1957) Black in Black and Barnes, 1959 and it should probably be considered a synonym of it. NB Both names were proposed by Gorka (1957) and illustrated with sketches which contain almost no useful detail. However Tremalithus ellipticus was described as being 18 µm long whilst Discolithus constans was described as 5-9 µm long - from these constans seems closer to the modern concept and indeed it is likely that T. ellipticus was based on another taxon altogether.

Farinacci & Howe catalog pages: Tremalithus ellipticus *

Distinguishing features: Similar to B. constans.

Search data:
TagsLITHS: placolith, elliptical, CA: process, closed, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 3->6µm;
Sources: assume the same as constans
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Neptune occurrences are almost all from mid-Cretaceous, but this may simply be an artefact due to a few authors using B. ellipticum in preference to B. constans
Last occurrence (top): within Late Maastrichtian Substage (66.04-69.91Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Bathonian Stage (166.07-168.28Ma, base in Bathonian stage). Data source: Burnett 1998

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: Biscutum ellipticum, synonyms included - Biscutum blackii; Biscutum ellipticum; Palaeopontosphaera elliptica;
  • space-time plot :: Samples map :: Parent: Biscutum

    References:

    Bornemann, A. & Mutterlose, J. (2006). Size analyses of the coccolith species Biscutum constans and Watznaueria barnesiae from the Late Albian “Niveau Breistroffer” (SE France): taxonomic and palaeoecological implications. Geobios. 39: 599-615. gs :: ::

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

    de Kaenel, E. & Bergen, J. A. (1996). Mesozoic calcareous nannofossil biostratigraphy from sites 897, 899, and 901, Iberia Abyssal Plain: New biostratigraphic evidence. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 27-59. gs :: view :: open

    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 :: ::

    Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs :: view :: open

    Hamilton, G. B. (1977). Early Jurassic calcareous nannofossils from Portugal and their biostratigraphic use. Eclogae Geologicae Helvetiae. 70: 575-597. gs :: view :: open

    Hardas, P. & Mutterlose, J. (2008). Calcareous nannofossil assemblages of Oceanic Anoxic Event 2 in the equatorial Atlantic: Evidence of an eutrophication event. Marine Micropaleontology. 66: 52-69. gs :: ::

    Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs :: view :: open

    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 :: ::


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    Biscutum ellipticum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10079 Go to Archive.is to create a permanent copy of this page - citation notes



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