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Globotruncanita conica


Classification: pf_mesozoic -> Globotruncanidae -> Globotruncanita -> Globotruncanita conica
Sister taxa: G. angulata, G. atlantica, G. conica, G. elevata, G. insignis, G. pettersi, G. stuarti, G. stuartiformis, G. sp.,

Taxonomy

Citation: Globotruncanita conica (White, 1928)
Rank: Species
Basionym: Globotruncana conica
Synonyms: Globotruncana dorreeni
Taxonomic discussion: -May have descended from Globotruncana falsostuarti.
-Syntype 1 illustrated below should be declared a lectotype. [copied from Chronos database]

Type images:

Original description: "Test large, strongly spiroconvex, coiled in a high trochospire. Spiral side strongly convex, umbilical side convex. Equatorial periphery circular, slightly lobate with a double keel composed of one primary and strongly beaded keel and a weakly developed secondary keel visible in the umbilical side of the periphery. Chambers arranged in 4 whorls increasing in size in the direction of coiling. Initial chambers small and globular and followed by larger, subpetaloid chambers becoming gradually larger in the direction of coiling. Final whorl composed of subpetaloid chambers on spiral side, on umbilical side ovoid chambers elongated in the direction of coiling. Sutures on spiral side curved, raised and strongly beaded, on umbilical side slightly curved, raised in the beginning of the last whorl and finally become depressed. Umbilicus raised in the beginning of the last whorl and finally become depressed. Umbilicus wide and deep, surrounded by periumbilical ridges and covered by tegilla. Primary aperture interiomarginal umbilical. Accessory apertures intralaminal. Surface smooth. Wall calcareous, perforate except for tegilla and keels."

Entries in the Catalog of original descriptions: Globotruncana conica, Globotruncana dorreeni

Geological Range:
Last occurrence (top): within G. gansseri zone (71.75-72.97Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. gansseri zone (71.75-72.97Ma, 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: Globotruncanita conica, synonyms included - Globotruncana conica; Globotruncana doreeni; Globotruncanita conica; Globotruncanita dorreeni;
  • space-time plot :: Samples map :: Parent: Globotruncanita

    Character matrix

    test outline:Circularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
    sp chamber shape:Subrectangularcoiling axis:Moderate-highperiphery:Single keelaperture border:Thin porticus
    umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Intralaminal
    spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:
    umbilical or test sutures:Weakly depressedfinal-whorl chambers:6.0-9.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Almogi-Labin, A., Reiss, Z & Caron, M. (1986). Senonian globotruncanidae from Israel. Eclogae Geologicae Helvetiae. 79(3): 849-895. gs

    Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

    Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs

    White, M. P. (1928). Some Index Foraminifera of the Tampico Embayment Area of Mexico. Journal of Paleontology. 2(3): 177-215. gs


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    Globotruncanita conica compiled by the pforams@mikrotax project team viewed: 22-10-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110192 Go to Archive.is to create a permanent copy of this page - citation notes



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