arrayname: original 

Microhedbergella praeplanispira

Taxonomy

Original description: Test wall microperforate (0.8 to 1.2 mm), pores randomly scattered, surface smooth to weakly pustulose, very rarely observed with scattered perforation cones. Test small, low trochospiral, spiral side flat to slightly depressed, equatorial periphery rounded, moderately lobate in equatorial outline, test thickness:diameter ratio averaging 0.49; chambers globular, increasing gradually in size, ultimate: penultimate chamber ratio averaging 1.12, dextrally or sinistrally coiled in 2.5 whorls with 5.5 to 7 chambers in the final whorl; sutures moderately depressed, radial on umbilical and spiral sides; umbilicus shallow, comprising 21 to 26 percent of the test diameter; aperture an extraumbilical low arch that extends from near the equatorial peripheral margin nearly to the umbilicus, bordered by a narrow lip that usually broadens to an imperforate apertural flap extending toward the umbilicus, often with relict apertural flaps surrounding the umbilicus.

Entries in the Catalog of original descriptions: Microhedbergella praeplanispira

Geological Range:
Last occurrence (top): within T. primula zone (107.39-111.84Ma, top in Albian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. rischi zone (112.40-112.96Ma, base in Albian 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
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Microhedbergella

Microhedbergella praeplanispira compiled by the pforams@mikrotax project team viewed: 21-4-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110350 Go to Archive.is to create a permanent copy of this page - citation notes

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