Dicarinella bouldinensis

Taxonomy

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 (92.51-93.52Ma, 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 range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Dicarinella

Dicarinella bouldinensis compiled by the pforams@mikrotax project team viewed: 13-5-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110085 Go to Archive.is to create a permanent copy of this page - citation notes

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Comments (1)

 

 

 

 

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Chengjie Liu

Posts: 6

Since: Feb 2019

Chengjie Liu(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).

6 August 2019 20:54

 

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