Conoglobigerina grigelisi

Taxonomy

Original description: Low to medium high conical test with a compact spire and 3.5–4 chambers in the last whorl. H/D ratio 0.5–1, rarely over 1. No preferred coiling direction observed. The chambers of the last whorl are large and have deeply incised sutures. Last whorl strongly embraces previous (? 2) whorls such that the earlier part of the test maybe hardly visible. Apex generally blunt, rarely pointed. Umbilical area depressed. Aperture generally a more or less symmetrical arch with lip, rarely comma-shaped. Specimens may have a small bulla over the umbilicus with one or two, low-arch apertures; it may resemble the bulla structure of Cenozoic Catapsydrax taxa. Wall microperforate, strongly pustulose; pustules form low and broken ridges that create an imperfectly reticulate pattern over the surface of the chambers.

Entries in the Catalog of original descriptions: Conoglobigerina grigelisi

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

Geological Range:
Last occurrence (top): within Early Kimmeridgian Substage (152.20-154.78Ma, top in Kimmeridgian stage). Data source: Gradstein et al. 2017
First occurrence (base): at base of Middle Oxfordian Substage (0% up, 159.4Ma, in Oxfordian 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: Conoglobigerina

Conoglobigerina grigelisi compiled by the pforams@mikrotax project team viewed: 12-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110585 Go to Archive.is to create a permanent copy of this page - citation notes

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