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Rugotruncana subcircumnodifer


Classification: pf_mesozoic -> Rugoglobigerinidae -> Rugotruncana -> Rugotruncana subcircumnodifer
Sister taxa: R. circumnodifer, R. nothi, R. subcircumnodifer, R. sp.,

Taxonomy

Citation: Rugotruncana subcircumnodifer (Gandolfi, 1955)
Rank: Species
Basionym: Globotruncana circumnodifer subcircumnodifer
Synonyms: Globotruncana japonica robusta; Globotruncana japonica

Type images:

Original description: This form is similar to G. fornicata ackermanni, but the Rugoglobigerina habitus is more developed. The test is slightly convex, the chambers are inflated, subangular, with the inflation more pronounced on the umbilical side, so that the faintly beaded double keel (narrow peripheral band) is not exactly in the middle of the chamber, but shifted more toward the dorsal side. The chambers, 4-5 in the last whorl, ar slightly more elongated; the sutures bcome radial in the last chambers; the test is rough, especially in the early stages, and the umbilicus is narrower. The test is dextrally coiled.

Entries in the Catalog of original descriptions: Globotruncana (Rugoglobigerina) circumnodifer subcircumnodifer, Globotruncana japonica robusta, Globotruncana japonica

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.30Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. calcarata zone (75.71-76.18Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

  • 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: Rugotruncana subcircumnodifer, synonyms included - Globigerinelloides japonica; Globotruncana japonica; Globotruncana japonica robusta; Globotruncana subcircumnodifer; Rugoglobigerina subcircumnodifer; Rugotruncana robusta; Rugotruncana subcircumnodifer;
  • space-time plot :: Samples map :: Parent: Rugotruncana

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
    sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Tegilla
    umb chbr shape:Trapezoidalumbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:Infralaminal
    spiral sutures:Moderately depressedumb depth:Deepwall texture:Finely pustuloseshell porosity:-
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Caron, M. (1985). Cretaceous planktic foraminifera. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. CUP, Cambridge 17-86. gs

    Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia. Bulletin of American Paleontology. 36: 1-118. gs


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    Rugotruncana subcircumnodifer compiled by the pforams@mikrotax project team viewed: 18-10-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110514 Go to Archive.is to create a permanent copy of this page - citation notes



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