Taxonomy
Original description:
Test wall moderately thick, multilamellar, finely perforate, wall pores variably spaced in adult chambers, surface moderately to coarsely muricate or pustulose, never with a keel, raised sutures or imperforate peripheral margin. Test small to moderate in size, coiled in a very low to low trochospire, spiral side evolute, umbilical side mostly involute; chambers globular, never elongated radially, increasing slowly to moderately in size, with 4.5-7 in the final whorl; aperture a low interiomarginal, umbilical-extraumbilical arch that is bordered by a thick lip or flap that may extend partly into the umbilical region.
Entries in the Catalog of original descriptions: Muricohedbergella
Distinguishing features:
Parent taxon (Hedbergellidae): Test trochospirally coiled, primary aperture interiomarginal, extraumbilical-umbilical, with prominent apertural lip, apertures of earlier chambers remain visible around the umbilical region; no sutural secondary apertures.
This taxon: Test wall multilamellar, finely perforate, wall pores, surface moderately to coarsely muricate or pustulose; test coiled in a very low to low trochospire; chambers globular with 4.5-7 in the final whorl; aperture a low interiomarginal, umbilical-extraumbilical arch bordered by a thick lip or flap.
Character matrix
test outline: | chamber arrangement: | Trochospiral | edge view: | aperture: | Umbilical-extraumbilical | ||
sp chamber shape: | coiling axis: | periphery: | aperture border: | Thin lip | |||
umb chbr shape: | umbilicus: | periph margin shape: | accessory apertures: | ||||
spiral sutures: | umb depth: | wall texture: | Finely muricate | shell porosity: | |||
umbilical or test sutures: | final-whorl chambers: | 4-7 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): at top of P0 zone (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within T. primula zone (107.39-111.84Ma, base in Albian stage). Data source: Total of ranges of species in this database
Plot of range and occurrence data:
Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gsReferences:
Muricohedbergella compiled by the pforams@mikrotax project team viewed: 14-11-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110357 Go to Archive.is to create a permanent copy of this page - citation notes |
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