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Radotruncana calcarata


Classification: pf_mesozoic -> Globotruncanidae -> Radotruncana -> Radotruncana calcarata
Sister taxa: R. calcarata, R. subspinosa, R. sp.,

Taxonomy

Citation: Radotruncana calcarata (Cushman, 1927)
Rank: Species
Basionym: Globotruncana calcarata
Synonyms: Globotruncana calcarata arcata; Globotruncana calcarata primitiva; Globotruncana calcarata retardata

Type images:

Original description: "Test trochoid, umbilicate, dorsal and ventral sides nearly parallel, the sides angled, obliquely truncate; chambers 4 or 5 in the final whorl, each with a stout peripheral spine, the early ones on the dorsal side oblique and marked by a bead-like ornamentation, ventrally radial, slightly depressed; aperture opening onto the umbilical region."

Entries in the Catalog of original descriptions: Globotruncana calcarata, Globotruncana calcarata arcata, Globotruncana calcarata primitiva, Globotruncana calcarata retardata

Geological Range:
Last occurrence (top): at top of R. calcarata zone (100% up, 75.7Ma, in Campanian stage). Data source: zonal marker (from Timescale Creator)
First occurrence (base): at base of R. calcarata zone (0% up, 76.2Ma, in Campanian stage). Data source: zonal marker (from Timescale Creator)

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: Radotruncana calcarata, synonyms included - Globotruncana calcarata; Globotruncana calcarata arcata; Globotruncana calcarata primitiva; Globotruncana calcarata retardata; Globotruncanita calcarata; Radotruncana arcata; Radotruncana calcarata; Radotruncana primitiva; space-time plot :: Samples map :: Parent: Radotruncana

    Character matrix

    test outline:Stellatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
    sp chamber shape:Subtriangularcoiling axis:Very lowperiphery:Single keelaperture border:Thick porticus
    umb chbr shape:Subrectangularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
    spiral sutures:Raised beadedumb 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:

    Cushman, J. A. (1927b). New and interesting foraminifera from Mexico and Texas. Contributions from the Cushman Laboratory for Foraminiferal Research. 3: 111-119. gs


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    Radotruncana calcarata compiled by the pforams@mikrotax project team viewed: 25-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110486 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

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    Mohammad Javad Razmjooei (Copenhagen, Denmark)

    I'm wondering to know how much the spines of R. calcarata can be long? Is it possible to be much longer than what we really see in an isolated specimen? It is so fragile and easy to break during the washing method. We might see the real size in the thin section maybe?

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    Brian Huber (Washington)

    It would be interesting to document the longest spines on calcarata from thin-section or sieved samples. Some spines have been clearly broken during sediment washing or by other means, but some well preserved specimens, such as that from Tanzania shown above, do not show evidence of breakage and one has to assume that they show the actual size.

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