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Marginotruncana renzi


Classification: pf_mesozoic -> Globotruncanidae -> Marginotruncana -> Marginotruncana renzi
Sister taxa: M. angusticarenata, M. caronae, M. coronata, M. desioi, M. manaurensis, M. marginata, M. paraconcavata, M. pileoliformis, M. pseudolinneiana, M. renzi, M. schneegansi, M. sigali, M. sigmoconcavata, M. sinuosa, M. tarfayaensis, M. undulata, M. sp.,

Taxonomy

Citation: Marginotruncana renzi (Gandolfi, 1942)
Rank: Species
Basionym: Globotruncana renzi

Type images:

Original description: Forma intermedia tra la G. apenninica Renz e la G. linnei (d'Orbigny); giri interni bicarenati o con una callosita che prelude alia doppia carena, giro esterno unicarenato. Il listello carenale e generalmente piu larga e basso che nella G. apenninica, talvolta pustuloso; decorre un po' obliquo e ondulato. La parte ombelicale ha un largo ombelico, le camere sono piu o meno convesse, piuttosto allungate come nella G. linnei. Ogni camera e rigorosamente orlata dalla biforcazione inferiore del listello carenale, che a decorso un po'sigmoidale s'ispessisce attorno all'ombelico. Da notare che le carene interne hanno un doppio listello carenale piu o meno riavvicinato, spesso solo visibile in sezione, ma talvolta anche all'estemo al principio dell 'ultimo giro.

Entries in the Catalog of original descriptions: Globotruncana renzi


Emended description: Translated from Italian: Test low trochospiral, commonly symmetrically biconvex; equatorial periphery slightly lobate; axial periphery angular, with two closely spaced keels becoming a single keel on the last few chamber (s). Chambers crescent-shaped, later becoming petaloid on spiral side; trapezoidal, elongated in the direction of coiling somewhat inflated on umbilical side; 5-6 chambers in final whorl. On spiral side sutures curved, oblique between the early chambers, perpendicolar to the preceding spiral suture in the younger part of the test and raised. On umbilical side the sutures are U-shaped, raised and continuing along the umbilicus as periumbilical ridges. Umbilicus wide and shallow. Aperture interiomarginal, extraumbilical-umbilical, with portici. [copied from Chronos database]

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.56-93.52Ma, base in Turonian 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: Marginotruncana renzi, synonyms included - Globotruncana renzi; Marginotruncana renzi; space-time plot :: Samples map :: Parent: Marginotruncana

    Character matrix

    test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Thin porticus
    umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
    spiral sutures:Raised beadedumb depth:Shallowwall texture:Smoothshell porosity:
    umbilical or test sutures:Raised beadedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Gandolfi, R. (1942). Ricerche micropaleontologiche e stratigraphfiche sulla Scaglia e sul flysch Cretacici dei Dintorni di Balerna (Canton Ticino). Rivista Italiana di Paleontologia. 48: 1-160. gs


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    Marginotruncana renzi compiled by the pforams@mikrotax project team viewed: 24-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110338 Go to Archive.is to create a permanent copy of this page - citation notes



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