Trinitella suturis

Taxonomy

Original description: Diagnosis: Trinitella suturis n. sp. is characterized by its small to medium sized test with 6.0-7.5 chambers in the final whorl; on the spiral side chambers are petaloid to strongly crescentic and separated by raised sutures; on the umbilical side two rows of rugosities sometimes form a double keel in the last chambers; coarse pustules and rugosities cover both sides of the test except for the last 2-3 chambers.

Description:Test small to medium, low trochospiral; profile with a flattened to slightly convex spiral side, sometimes with slightly imbricated chambers, and a flat to convex umbilical side; 2- 2.5 whorls with 6.0-7.5 (usually 7) chambers in the final whorl, increasing initially gradually and then rapidly in size as added; the final 1-2 chambers are always flattened on the spiral side; equatorial periphery lobate; on the spiral side chambers petaloid to strongly crescentic, separated by raised and curved sutures; on the umbilical side, depressed and radial sutures separate subglobular and inflated chambers; two rows of rugosities separated by imperforate peripheral band observed in all chambers of the last whorl and form a distinct initial double-keeled periphery on the last chambers; on spiral side, chamber surface typically covered with rugosities that become weaker or absent on the last 2-3 chambers; on umbilical side strong pustules and rugosites observed; primary aperture umbilical; umbilical system composed of tegilla.

Entries in the Catalog of original descriptions: Trinitella suturis

Distinguishing features:
Parent taxon (Trinitella): Test in flat trochospiral, chambers enlarging rapidly as added, early ones globular, later chambers compressed to rhomboidal in section, imperforate carinal band or faint keel in the final whorl, sutures radial, depressed, peripheral margin rounded to truncate, peripheral outline lobulate; wall calcareous, perforate, surface covered with prominent pustules and costellae in meridional arrangement, less prominent on the final chamber; primary aperture interiomarginal, umbilical, bordered by an imperforate flap, those of successive chambers fusing into a tegillum having both proximal and distal accessory apertures.
This taxon: The test usually has 7 chambers in the last whorl and raised and curved spiral sutures. Two rows of rugosities form a double keel on the final chambers.

Most likely ancestor: Trinitella scotti - at confidence level 2 (out of 5). Data source: Huber et al. 2022, p. 35.

Geological Range:
Notes: Maastrichtian
Last occurrence (top): at top of P. hariaensis zone (100% up, 66.4Ma, in Maastrichtian stage). Data source: [Huber et al. 2022, p. 35]
First occurrence (base): in mid part of A. mayaroensis zone (50% up, 68.5Ma, in Maastrichtian stage). Data source: [Huber et al. 2022, p. 35]

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: Trinitella

Trinitella suturis compiled by the pforams@mikrotax project team viewed: 7-12-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110607 Go to Archive.is to create a permanent copy of this page - citation notes

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