arrayname: original 

Microhedbergella rischi

Taxonomy

Original description: Translated from French : "Hedbergella sp. aff. infracretacea usually displays a more noticeable increase in the height of the spire, hence a slightly more important last chamber compared to the preceding ones. In profile view, the test seems to have a slightly less thick section. The ventral side is umbilicate as opposed to H. infracretacea which is devoid of umbilicus. In the evolved well-characterized forms, we can see a noticeable extension of the aperture towards the periphery, clearly reaching the dorsal edge: the coiling, however, remains asymmetrical, does not become planispiral. Occasionally a slight distortion of the trochospire has also been observed, the arrangement of the last chambers appearing to be less even than in H. infracretacea." [from Moullade 1966]

Entries in the Catalog of original descriptions: Hedbergella rischi

Geological Range:
Last occurrence (top): within P. ticinensis zone (101.92-103.94Ma, top in Albian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of M. rischi zone (0% up, 113Ma, in Albian stage). Data source: zonal marker (from Timescale Creator)

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: Microhedbergella rischi, synonyms included - Hedbergella rischi;
• See also space-time plot :: Samples map :: Parent: Microhedbergella

Microhedbergella rischi 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=110355 Go to Archive.is to create a permanent copy of this page - citation notes

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