nmn

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: Diagnosis.- A low trochospiral species of Dicarinella with wedge-shaped chambers in last whorl and small umbilicus.

Description.-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:

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:chamber arrangement:Trochospiraledge view:aperture:
    sp chamber shape:coiling axis:Lowperiphery:aperture border:
    umb chbr shape:umbilicus:periph margin shape:accessory apertures:
    spiral sutures:umb depth:wall texture:shell porosity:
    umbilical or test sutures:final-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

    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. gs


    logo

    Dicarinella takayanagii compiled by the pforams@mikrotax project team viewed: 21-8-2019

    Taxon Search:
    Advanced Search

    Short stable page link: http://mikrotax.org/pforams/index.php?id=110097 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (0)

    No comments yet. Be the first!

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics