Dicarinella takayanagii

Taxonomy

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, 93.2Ma, in Turonian stage). Data source:
First occurrence (base): near top of Cenomanian Stage (90% up, 94.6Ma, in Cenomanian stage). Data source:

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 takayanagii 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=110097 Go to Archive.is to create a permanent copy of this page - citation notes

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