arrayname: original 

Muricohedbergella kyphoma

Taxonomy

Original description: Diagnosis.- A low trochospiral species of Hedbergel/a with last four chambers umbilically shifted, compressed, and spirally elongate. Umbilicus narrow, sutures of last four chambers slightly curved.

Description.-Test of medium size, initially very low trochospiral, later becoming medium trochospiral, equatorial periphery lobulate; chambers initially globular, later slightly compressed and spirally elongated, 11 to 14 in all arranged into 2.5 to 3 whorls, enlarging gradually in size as added except for last 3 or 4 which enlarge irregularly, 6 or 7 in last whorl, last 3 or 4 characteristically elongated, compressed and shifted toward umbilicus, last chamber variable in size and shape; sutures initially radial and depressed on dosal side except for last 3 or 4 chambers in which they are curved, slightly curved and depressed on ventral side; coiling axis initially stable, later rapidly tilted for last 3 or 4 chambers, as a result, initial umbilicus occasionally being covered by last 3 or 4 chambers; umbilicus shallow, very narrow, less than 1/5 of maximum diameter of test; primary aperture bordered by a narrow lip, interiomarginal, umbilical-extraumbilical, extending to periphery; wall calcareous, surface poorly ornamented.

Entries in the Catalog of original descriptions: Hedbergella kyphoma

Geological Range:
Notes: According to Falzoni & Petrizzo (2020): "Muricohedbergella kyphoma was described from the W. archaeocretacea Zone of Japan (Hasegawa, 1999) and never recognized in other localities. At Eastbourne, M. kyphoma commonly occurs in the Plenus Marl Bed 4 and 5 in the interval corresponding to the topmost R. cushmani Zone to lowermost W. archaeocretacea Zone (i.e., 11.2e12.2 m above the base of the section). An increase in abundance of M. kyphoma slightly above the extinction level of R. cushmani was also reported in Japan (Hasegawa, 1999)."
Last occurrence (top): in mid part of H. helvetica zone (51% up, 93Ma, in Turonian stage). Data source: Huber edit
First occurrence (base): in mid part of R. cushmani zone (49% up, 96.4Ma, in Cenomanian stage). Data source: Huber edit

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: Muricohedbergella

Muricohedbergella kyphoma compiled by the pforams@mikrotax project team viewed: 22-4-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110369 Go to Archive.is to create a permanent copy of this page - citation notes

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