Repagulum parvidentatum


Classification: Mesozoic -> Heterococcoliths inc sedis -> placoliths inc sedis -> Repagulum -> Repagulum parvidentatum
Sister taxa: R. parvidentatum, R. sp.,

Distinguishing features: Small, elliptical placoliths with monocyclic distal shield with numerous, narrow elements and central-area spanned by ~20 radial bars. In LM the coccoliths are distinctive but inconspicuous with low birefringence, "flaring" image.


Taxonomy:

Citation: Repagulum parvidentatum (Deflandre & Fert, 1954) Forchheimer, 1972
Rank: Species
Basionym: Discolithus parvidentatus Deflandre & Fert, 1954
Synonyms: Reticulofenestra parvidentataDeflandre and Fert) Noël, 1970
Tremalithus burwellensis Black 1959 [my interpretation - JRY 2015]

Farinacci & Howe catalog pages: Discolithus parvidentatus * , Tremalithus burwellensis * ,

Distinguishing features: Small, elliptical placoliths with monocyclic distal shield with numerous, narrow elements and central-area spanned by ~20 radial bars. In LM the coccoliths are distinctive but inconspicuous with low birefringence, "flaring" image.


Evolution & Phylogeny: This is an anomalous species with no obvious ancestor or descendants

Ecology & Biogeography: Can be common. Shows mid to high latitude biogeography, so regarded as a cold water taxon

Geological Range:
Notes: Typical reported range is Lower Hauterivian-Maastrichtian, but occurs earlier (Valanginian) in the Indian Ocean (Bown, 1992).
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Bown et al. 1998
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian 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: Repagulum parvidentatum, synonyms included - Repagalum parvidentatum; Repagulum parvidentatum; Reticulofenestra parvidentata; space-time plot :: Samples map :: Parent: Repagulum

    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., 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

    Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

    Forchheimer, S. (1972). Scanning electron microscope studies of Cretaceous coccoliths from the Köpingsberg Borehole No. 1, SE Sweden. Sveriges Geologiska Undersökning; Series C. #668, 65: 1-141. gs

    Noël, D. (1970). Coccolithes Crétacés: La Craie Campanienne du Bassin de Paris. Éditions du Centre National de la Recherche Scientifique, Paris. -. gs


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    Repagulum parvidentatum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10994 Go to Archive.is to create a permanent copy of this page - citation notes



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