Hedbergella tatianae

Taxonomy

Original description: The test consists of about two whorls of chambers. 4½ chambers in the first whorl and 4 in the final whorl. The spiral side is almost flat; the umbilical side is more convex and has a narrow, deep umbilicus which is in breadth equal to about 1/8th of the test diameter. The chambers become reniform and depressed with growth, to become about half as high as long when seen on the spiral side. The aperture is a narrow slit, umbilical to extraumbilical, nearly but not quite reaching the periphery of the previous whorl, and is furnished with a porticus which is broadest at its umbilical end. The surface of the test is smooth and nonmuricate: it is uniformly microperforate, the microperforations being about 0.6 mu m in diameter but often broadened at their outer ends (through test erosion) to about 1.5 µm. "Test erosion (fig. 1b) also shows how the perforations are the external openings of canaliculi, which have erosion-resistant granular walls (analogous to those of benthic rotalines as described by Banner and Williams, 1978. Early stages of test surface dissolution (fig. 2b) also reveal the sutural margins between adjacent canalicular walls (compare Banner and Williams, 1978, pl. 2).

Entries in the Catalog of original descriptions: Praehedbergella tatianae

Geological Range:
Last occurrence (top): within L. cabri zone (119.05-120.55Ma, top in Aptian stage). Data source:
First occurrence (base): within L. cabri zone (119.05-120.55Ma, base in Aptian 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: Hedbergella

Hedbergella tatianae compiled by the pforams@mikrotax project team viewed: 29-4-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110268 Go to Archive.is to create a permanent copy of this page - citation notes

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