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Abathomphalus intermedius


Classification: pf_mesozoic -> Globotruncanidae -> Abathomphalus -> Abathomphalus intermedius
Sister taxa: A. intermedius, A. mayaroensis, A. sp.,

Taxonomy

Citation: Abathomphalus intermedius (Bolli, 1951)
Rank: Species
Basionym: Globotruncana intermedius
Synonyms: Globotruncana intermedia difformis; Globotruncana hanzawai; Globotruncana pessagnoi

Type images:

Original description: The test is usually slightly convex on the dorsal side, flat or often slightly convex ventrally, and distinctly lobate, but this is less pronounced than in G. citae. The five, occasionally four, chambers of the last whorl usually possess a marked peripheral edge or keel, and sometimes a second keel is developed (transition to G. mayaroensis). The sutures on the dorsal side are distinctly curved, whereas ventrally they are radial. The chambers often appear slightly inflated and a few show striations, which are radial on the ventral side and more tangential dorsally. The state of preservation of the specimens so far examined has not allowed detailed study of the aperture or apertures, which probably open into the umbilicus.

Entries in the Catalog of original descriptions: Globotruncana intermedia, Globotruncana intermedia difformis, Globotruncana hanzawai, Globotruncana pessagnoi

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 A. mayaroensis zone (67.30-69.18Ma, base in Maastrichtian 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: Abathomphalus intermedius, synonyms included - Abathomphalus difformis; Abathomphalus hanzawai; Abathomphalus intermedius; Globotruncana difformis; Globotruncana hanzawae; Globotruncana intermedia; Globotruncana intermedia difformis; Globotruncana pessagnoi; Marginotruncana difformis;
  • space-time plot :: Samples map :: Parent: Abathomphalus

    Character matrix

    test outline:Circularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Coalescing portici
    umb chbr shape:Petaloidumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
    spiral sutures:Strongly depressedumb depth:Deepwall texture:Mod. Pustuloseshell porosity:Macroperforate: >2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Bolli, H. M. (1951b). The genus Globotruncana in Trinidad. Journal of Paleontology. 25(2): 187-199. gs

    Robaszynski, F., Caron, M., Gonzales Donoso, J. M., Wonders, A. A. H. & the European Working Group on Planktonic Foraminifera (1984). Atlas of Late Cretaceous globotruncanids. Revue de Micropaléontologie. 26(03-Apr): 145-305. gs


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    Abathomphalus intermedius compiled by the pforams@mikrotax project team viewed: 19-10-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110002 Go to Archive.is to create a permanent copy of this page - citation notes



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