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Globotruncana neotricarinata


Classification: pf_mesozoic -> Globotruncanidae -> Globotruncana -> Globotruncana neotricarinata
Sister taxa: G. aegyptiaca, G. arca, G. bulloides, G. dupeublei, G. esnehensis, G. falsostuarti, G. hilli, G. lapparenti, G. linneiana, G. mariei, G. neotricarinata, G. orientalis, G. rosetta, G. rugosa, G. ventricosa, G. sp.,

Taxonomy

Citation: Globotruncana neotricarinata Petrizzo, Falzoni, & Premoli Silva 2011
Rank: Species
Basionym: Globotruncana neotricarinata

Type images:

Original description: Wall macroperforate. Test low trochospiral, equatorial periphery lobate, lateral profile asymmetrical, spiral side from flat to weakly convex, umbilical side more convex, peripheral margin with two equidistant keels parallel to the coiling axis or weakly tilted towards the umbilical side and separated by a narrow and imperforate band. An apparent third keel is present due to the increase of the last chambers height on the umbilical side that results in an umbilical shoulder. Five to eight chambers in final whorl slowly increasing in size, trapezoidal, from flat to slightly inflated on the umbilical side, petaloid to slightly crescent-shaped chambers, smooth and flat on the spiral side; sutures raised from sigmoidal to curved on the umbilical side, curved and raised on the spiral side; primary aperture umbilical and covered by tegilla. Distinguished from G. linneiana ( = G. tricarinata) by having a trapezoidal instead of a rectangular peripheral margin, a narrower peripheral band and an apparent third keel that results in a weakly developed umbilical shoulder. Differs from G. ventricosa in having a more compressed peripheral outline and by possessing a less raised umbilical shoulder that develops only on the last chambers of the last whorl. Phylogenetic relationships. This form evolved from G. linneiana by increasing the height of the chambers on the umbilical side and by acquiring an apparent third keel on the peripheral view. It gave rise to G. ventricosa through the developing of the convexity of the umbilical side.

Entries in the Catalog of original descriptions: Globotruncana neotricarinata

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 D. asymetrica zone (84.19-86.71Ma, base in Coniacian 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: Globotruncana

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
    sp chamber shape:Petaloidcoiling axis:Lowperiphery:aperture border:Tegilla
    umb chbr shape:umbilicus:periph margin shape:accessory apertures:
    spiral sutures:umb depth:wall texture:shell porosity:Microperforate: <1┬Ám
    umbilical or test sutures:final-whorl chambers:5.0-8.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Petrizzo, M. R., Falzoni, F. & Premoli Silva, I. (2011b). Identification of the base of the lower-to-middle Campanian Globotruncana ventricosa Zone: Comments on reliability and global correlations. Cretaceous Research. 32: 387-405. gs


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    Globotruncana neotricarinata compiled by the pforams@mikrotax project team viewed: 22-9-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110167 Go to Archive.is to create a permanent copy of this page - citation notes



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