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Globotruncanella compressiformis


Classification: pf_mesozoic -> Globotruncanidae -> Globotruncanella -> Globotruncanella compressiformis
Sister taxa: G. compressiformis, G. havanensis, G. minuta, G. petaloidea, G. pschadae, G. semsalensis, G. sp.,

Taxonomy

Citation: Globotruncanella compressiformis (Pessagno, 1962)
Rank: Species
Basionym: Praeglobotruncana hessi compressiformis

Type images:

Original description: Spiral side flattened to gently convex; periphery lobulate chambers increasing rapidly in size; nepionic chambers spherical; later chambers becoming markedly ovate and highly compressed; early chambers coarsely spirose; last 2-3 chambers smooth, often a modified hemispherical shape with a sharp dorsal keel which appears to be radial, hyaline, perforate; sutures depressed, radial, slightly curved on both spiral and umbilical sides; aperture interiomarginal; appears to be a low arch, extraumbilical in position; large umbilical flaps extend into a broad umbilicus from each chamber.

Entries in the Catalog of original descriptions: Praeglobotruncana hessi compressiformis

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within Maastrichtian Stage (66.04-72.05Ma, 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

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Globotruncanella

    Character matrix

    test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thin flange
    umb chbr shape:Globularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Umbilical
    spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5┬Ám
    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:

    Pessagno, E. A. (1962). The Upper Cretaceous stratigraphy and micropaleontology of south-central Puerto Rico. Micropaleontology. 8(3): 349-368. gs


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    Globotruncanella compressiformis compiled by the pforams@mikrotax project team viewed: 15-12-2019

    Taxon Search:
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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110180 Go to Archive.is to create a permanent copy of this page - citation notes



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