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Hedbergella


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella
Sister taxa: Asterohedbergella, Clavihedbergella, Costellagerina, Falsotruncana, Hedbergella, Helvetoglobotruncana, Liuenella, Microhedbergella, Muricohedbergella, Paracostellagerina, Paraticinella, Praeglobotruncana, Pseudoguembelitria, Whiteinella,
Daughter taxa: (blue => in age window 0-300Ma)

































Specimens which cannot be assigned to established species

Taxonomy

Citation: Hedbergella Bronnimann and Brown 1958
Rank: Genus
Basionym: Anomalina lorneiana var. trochoidea
Type species: Anomalina lorneiana d'Orbigny var. trochoidea Gandolfi, 1942

Type images:

Original description: Hedbergella Brönnimann & Brown, 1958:

Entries in the Catalog of original descriptions: Hedbergella;

Distinguishing features: Test trochospiral, wall finely perforate, outer wall weakly to densely covered with perforation cones or perforation ridges (coalescing perforation cones); umbilical and spiral sutures depressed, radial, straight to slightly curved; aperture an interiomarginal extraumbilical-umbilical arch with a thin imperforate rim, rarely with a narrow bordering lip.


Emended description: Huber and Leckie, 2011: Test wall finely perforate, outer wall weakly to densely covered with perforation cones or perforation ridges (coalescing perforation cones), never with an imperforate or keeled peripheral margin or with muricae and rarely with small, blunt pustules. Test small to relatively large in size, coiled in a low to moderately high trochospire with a rounded equatorial periphery, umbilicate; chambers globular to ovate, four to nine in the final whorl; umbilical and spiral sutures depressed, radial, straight to slightly curved; aperture an interiomarginal extraumbilical-umbilical arch with a thin imperforate rim or in rare cases a narrow bordering lip.

Geological Range:
Last occurrence (top): within Albian Stage (100.50-112.95Ma, top in Albian stage). Data source: Total of range of species in this database
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

Character matrix

test outline:chamber arrangement:Trochospiraledge view:aperture:
umb chamber shape:coiling axis:periphery:N/Aaperture border:
sp chbr shape:umbilicus:periph margin shape:accessory apertures:
umbilical or test sutures:umb depth:wall texture:shell porosity:
spiral sutures:diameter mm:width mm:breadth mm:
final-whorl chambers:4.0-9.0

References:

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.

Loeblich, A.R. & Tappan, H., (1988). Foraminiferal Genera and Their Classification (Volume I-II)Van Nostrand Reinhold Co., New York, 1059 pp.


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Hedbergella compiled by the pforams@mikrotax project team viewed: 20-9-2018

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110234Go to Archive.is to create a permanent copy of this page - citation notes



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