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.,


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: Marginotruncana bouldinensis Pessagno 1967: 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

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umb.-extraumbilical
umb chamber shape:Crescenticcoiling axis:Very lowperiphery:Double keelaperture border:Thin porticus
sp chbr shape:Crescenticumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
umbilical or test sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1┬Ám
spiral sutures:Raised beadeddiameter mm:width mm:breadth mm:
final-whorl chambers:4.0-5.0


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


Dicarinella bouldinensis compiled by the pforams@mikrotax project team viewed: 22-2-2018

Taxon Search:
Advanced Search

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
Captcha Image
Powered by Commentics