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Dicarinella roddai


Classification: pf_mesozoic -> Globotruncanidae -> Dicarinella -> Dicarinella roddai
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 roddai (Marianos and Zingula, 1966)
Rank: Species
Basionym: Globotruncana roddai

Type images:

Original description: Test large, trochospiral, biconvex; periphery lobate, having a closely spaced double keel above the median line, becoming weaker and more closely spaced on the last and penultimate chambers; chambers smooth and overlapping dorsally, inflated ventrally, early chambers of last whorl rugose ventrally, later ones smooth; sutures curved, raised and thickened dorsally, ventrally depressed and radial; umbilicus narrow and deep; aperture interomarginal, umbilical. Some specimens exhibiting a weak ridge at the umbilical margin of early chambers of the last whorl formed by enlarged and coalescing pustules.

Entries in the Catalog of original descriptions: Globotruncana roddai

Geological Range:
Last occurrence (top): within D. concavata zone (86.71-89.91Ma, top in Coniacian 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

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

    Character matrix

    test outline:Circularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
    sp chamber shape:Petaloidcoiling axis:Very lowperiphery:Double keelaperture border:Thin porticus
    umb chbr shape:Trapezoidalumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
    spiral sutures:Strongly depressedumb depth:Deepwall texture:Smoothshell porosity:
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Marianos, A. W. & Zingula, R. P. (1966). Cretaceous planktonic foraminifers from Dry Creek, Tehama County, California. Journal of Paleontology. 40: 328-343. gs


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    Dicarinella roddai compiled by the pforams@mikrotax project team viewed: 20-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110095 Go to Archive.is to create a permanent copy of this page - citation notes



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