Trinitella scotti

Taxonomy

Original description: The trochoidal test is small to medium-sized and elongate in direction of the end chamber. The five to six chambers of the adult volution are subglobular at first. They then become flattened at the spiral side, forming a keel. These new features pertain to the end chamber, occasionally also to the two last ones. The end chamber is about twice as large as the penultimate one and elongate in radial direction. About two whorls can be recognized on the spiral side. The slightly depressed initial portion is not clearly exposed, and no information regarding the arrangement of the early chambers can be obtained due to the coarse rugosities or adhering matrix.
The umbilicus is large, deep, subcircular and probably provided with a delicate covering plate. Only fragments of this plate are preserved along the border of the umbilicus. The chambers are truncate toward the apertural side and increase in size as added. Seen from the spiral side, each adult chamber overlaps the next one. The sutures on the spiral side, therefore, are strongly curved in the direction of coiling. Those on the umbilical side are deep and relatively straight to slightly curved backward.
The arcuate apertures open into the umbilicus. The walls seem to be thick, and the surface, especially of the inner chambers, is strongly rugose. The ornamentation appears to be of the meridional pattern, although no central point was noted on the surface of the end chamber.
The counted individuals are invariably dextrally coiling.

Entries in the Catalog of original descriptions: Trinitella scotti, Rugoglobigerina (Rugoglobigerina) bronnimanni

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.64Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. gansseri zone (71.73-73.80Ma, base in Campanian 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
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Trinitella scotti, synonyms included - Rugoglobigerina bronnimani; Rugoglobigerina scotti; Ticinella bronnimani; Trinitella scotti;
• See also space-time plot :: Samples map :: Parent: Trinitella

Trinitella scotti 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=110564 Go to Archive.is to create a permanent copy of this page - citation notes

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