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Dicarinella asymetrica


Classification: pf_mesozoic -> Globotruncanidae -> Dicarinella -> Dicarinella asymetrica
Sister taxa: D. asymetrica, D. bouldinensis, D. canaliculata, D. concavata, D. hagni, D. imbricata, D. longoriai, D. marianosi, D. primitiva, D. roddai, D. takayanagii, D. sp.,

Taxonomy

Citation: Dicarinella asymetrica (Sigal, 1952)
Rank: Species
Basionym: Globotruncana asymetrica
Synonyms:
Taxonomic discussion: SEM photo in "Atlas du Cretace Moyen" vol. 2-1979, pl. 51/fig. 1a-c. Topotypes (2) F6 0819 [copied from Chronos database]

Type images:

Original description: En même temps se développe une autre espèce caractéristique par sa profonde dissymétrie du test, Globotruncana asymetrica n. sp. (fig. 35) qui n'est pas sans présenter quelque analogie avec certains Rotalipora du Cénomanien (R. reicheli MORNOD par example).

Translated from French. A species characterized by a strong asymmetry of the test, displaying a degree of analogy with some Cenomanian Rotalipora (Rotalipora reicheli (Mornod) [Globotrucana (Rotalipora) reicheli], for example).

Entries in the Catalog of original descriptions: Globotruncana asymetrica, Globotruncana (Globotruncana) ventricosa carinata, Globotruncana fundiconulosa

Geological Range:
Last occurrence (top): at top of D. asymetrica zone (100% up, 84.2Ma, in Santonian stage). Data source: zonal marker (from Timescale Creator)
First occurrence (base): at base of D. asymetrica zone (0% up, 86.7Ma, in Coniacian stage). Data source: zonal marker (from Timescale Creator)

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: Dicarinella asymetrica, synonyms included - Dicarinella asymetrica; Dicarinella carinata; Globotruncana ventricosa carinata; space-time plot :: Samples map :: Parent: Dicarinella

    Character matrix

    test outline:Subcircularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Thin porticus
    umb chbr shape:Subrectangularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Intralaminal
    spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-6.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Sigal, J. (1952). Apercu stratigraphique sur la micropaleontologie du Cretace. XIX Congr. géol. internat., Algers, Monographies Regionales. 1(26): 3-43. gs


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    Dicarinella asymetrica compiled by the pforams@mikrotax project team viewed: 22-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110084 Go to Archive.is to create a permanent copy of this page - citation notes



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