Globuligerina tojeiraensis

Taxonomy

Original description: Relatively low to medium high trochospiral, with an H/D ratio of 0.3–05, rarely larger. Test consists of 2–3 whorls with a tiny initial chamber (where visible). No preferred coiling direction observed. Last whorl with four chambers, which strongly increase in width, flaring out. Chambers are rounded with deeply incised sutures; chambers in the last whorl often radially elongate and higher than broad; last chamber often pointing slightly left or right in the equatorial plane. The test has a sunk-in umbilical region; umbilicus small to large (wide open). G. tojeiraensis has this peculiar knack (depressed umbilicus) with surrounding chambers often sticking up two by two. The chambers 2 and 4 of the last whorl stick more up than chambers 1 and 3.
Aperture a low to rarely high arch; it may be slightly asymmetrical in shape, as shown on Fig. 12.5a; aperture generally umbilical in position, rarely umbilical—extraumbilical. A small bulla occurs rarely; it obscures the aperture of the final chamber. Wall pustulose; pustules may fuse to form broken ridges.

Entries in the Catalog of original descriptions: Globuligerina tojeiraensis

Most likely ancestor: Globuligerina oxfordiana - at confidence level 2 (out of 5). Data source: Gradstein et al. 2017 p.263.

Geological Range:
Last occurrence (top): within Early Tithonian Substage (145.00-149.24Ma, top in Tithonian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Callovian Stage (161.50-165.30Ma, base in Callovian stage). Data source: Gradstein et al. 2017

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: Globuligerina

Globuligerina tojeiraensis compiled by the pforams@mikrotax project team viewed: 11-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110584 Go to Archive.is to create a permanent copy of this page - citation notes

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