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Dicarinella takayanagii


Classification: pf_mesozoic -> Globotruncanidae -> Dicarinella -> Dicarinella takayanagii
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 takayanagii Hasegawa 1999
Rank: Species
Basionym: Dicarinella takayanagii

Type images:

Original description: Dicarinella takayanagii Hasegawa 1999: Test of medium to large size, low trochospiral, equatorial periphery lobulate; chambers initailly globigerine-like, later ones becoming wedge-shaped and flat on dorsal side, triangular and inflated in shape on ventral side, about 10 chambers in all, enlarging rapidly in size as added, about 4.5 chambers in last whorl, with widely separated weak double peripheral keels, one of which is shifted toward spiral side; final chamber diagnostically elongated in spiral direction, occasionally lacking peripheral keels; sutures on dorsal side gently curved, raised with keels that are continuous to one of peripheral keels, sutures on ventral side radial and depressed; umbilicus shallow and narrow, its width about 1/4 of maximum diameter of test; primary aperture bordered by a distinct lip, interiomarginal, umbilical-extraumbilical; wall calcareous, earlier chambers weakly pustulated.

Entries in the Catalog of original descriptions: Dicarinella takayanagii;

Geological Range:
Last occurrence (top): in lower part of Turonian Stage (15% up, 93.3Ma, in Turonian stage). Data source:
First occurrence (base): near top of Cenomanian Stage (90% up, 94.6Ma, in Cenomanian stage). Data source:

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:chamber arrangement:Trochospiraledge view:aperture:
umb chamber shape:coiling axis:Lowperiphery:aperture border:
sp chbr shape:umbilicus:periph margin shape:accessory apertures:
umbilical or test sutures:umb depth:wall texture:shell porosity:
spiral sutures:diameter mm:0.29width mm:breadth mm:0.17
final-whorl chambers:4.0-5.0

References:

Hasegawa, T., (1999). Planktonic foraminifera and biochronology of the Cenomanian-Turonian (Cretaceous) sequence in the Ohyubari area, Hokkaido, Japan. Paleontological Research, 3: 173-192.


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Dicarinella takayanagii compiled by the pforams@mikrotax project team viewed: 19-11-2017

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