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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: Globotruncana roddai Marianos and Zingula 1966: 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:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Circularcoiling axis:Very lowchamber arrangement:Trochospiralumbilicus:Narrow
edge view:Planoconvexumbilical or test sutures:Strongly depressedspiral sutures:Strongly depressedshell porosity:
wall texture:Smoothaperture:Umbilicalaperture border:Thin porticusaccessory apertures:None
periphery:Double keelumb chamber shape:Trapezoidalsp chbr shape:Petaloidperiph margin shape:Subangular
umb depth:Deepdiameter mm:0.45 - 0.54width mm:breadth mm:0.25
final-whorl chambers:5.0-6.0

References:

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


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Dicarinella roddai compiled by the pforams@mikrotax project team viewed: 23-7-2017

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