Haqius ellipticus


Classification: Mesozoic -> Heterococcoliths inc sedis -> placoliths inc sedis -> Haqius -> Haqius ellipticus
Sister taxa: H. circumradiatus, H. ellipticus, H. peltatus, H. sp.,

Distinguishing features: Large (>7.0 µm) unicyclic placolith with a narrow or closed central area. Under LM XPL the shields appear gray and the numerous individual elements are usually visible. The proximal shield is significantly smaller than the distal and is often clearly distinguishable.


Taxonomy:

Citation: Haqius ellipticus (Grün in Grün and Allemann, 1975) Bown, 1992 emend. Bown, 2005
Rank: Species
Basionym: Markalius ellipticus Grün in Grün and Allemann, 1995

Farinacci & Howe catalog pages: Markalius ellipticus * , ,

Distinguishing features: Large (>7.0 µm) unicyclic placolith with a narrow or closed central area. Under LM XPL the shields appear gray and the numerous individual elements are usually visible. The proximal shield is significantly smaller than the distal and is often clearly distinguishable.


Morphology remarks: Distinguished from the smaller species, Haqius peltatus, on size (>7.0 µm).

Geological Range:
Last occurrence (top): within Early Barremian Substage (129.41-130.77Ma, top in Barremian stage). Data source: Bown et al. 1998
First occurrence (base): within Late Tithonian Substage (145.01-147.72Ma, base in Tithonian stage). Data source: Bown et al. 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: Haqius ellipticus, synonyms included - Haqius ellipticus; Markalius ellipticus; space-time plot :: Samples map :: Parent: Haqius

    References:

    Bown, P. R. (1992). New calcareous nannofossil taxa from the Jurassic/Cretaceous boundary interval of Sites 765 and 261, Argo Abyssal Plain. Proceedings of the Ocean Drilling Program. Scientific Results. 123: 369-379. 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

    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


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    Haqius ellipticus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10492 Go to Archive.is to create a permanent copy of this page - citation notes



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