nmn

Dicarinella bouldinensis


Classification: pf_mesozoic -> Globotruncanidae -> Dicarinella -> Dicarinella bouldinensis
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 bouldinensis (Pessagno, 1967)
Rank: Species
Basionym: Marginotruncana bouldinensis
Taxonomic discussion: -Distorted test, makes it difficult to determine proper synonymy [copied from Chronos database]

Type images:

Original description: Test trochospiral, spiroconvex, with 4-5 chambers in last whorl. Chambers of spiral side crescent-shaped, individually somewhat planiform; earlier chambers somewhat rugose; sutures curved, raised, often beaded. Umbilical side of test slightly concave with rugosities sometimes present on first one or two chambers of last whorl; sutures radial, straight to slightly curved; chambers wedge-shaped; predominantly depressed. Umbilicus shallow and broad though somewhat variable in size. Periphery with double keel which seems to be better developed posteriorly than anteriorly. Primary aperture extraumbilical-umbilical in position. Portici with infralaminal accessory apertures on well-preserved specimens. Outer wall radial hyaline, perforate except for double keel which is radial hyaline imperforate. Septal wall microgranular hyaline, perforate. Portici microgranular hyaline perforate (?).

Entries in the Catalog of original descriptions: Marginotruncana bouldinensis

Geological Range:
Last occurrence (top): within H. helvetica zone (92.56-93.52Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within W. archaeocretacea zone (93.52-94.03Ma, base in Cenomanian 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:Spiroconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Crescenticcoiling axis:Very lowperiphery:Double keelaperture border:Thin porticus
    umb chbr shape:Crescenticumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
    spiral sutures:Raised beadedumb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1µm
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs


    logo

    Dicarinella bouldinensis 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=110085 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

    Sort By
    Page 1 of 1
     
    Gravatar
    Chengjie Liu (Houston, US)

    Both Dicarinella longoriai Peryt (1980) and Dicarinella takayanagii Hasegawa (1999) seem to be junior synonyms of Dicarinella bouldinensis (Pessagno, 1967)for their flat to low biconvex subelongate test, wide-spaced double keel, 4.5-5 chambers in the final whorl, umbilical-extraumbilical aperture with a prominent apertural flap, and similar stratigraphic range (Latest Cenomanain-Earliest Turonian).

    Page 1 of 1
     

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics