pforams@mikrotax - Asterohedbergella

Asterohedbergella


Classification: pf_mesozoic -> Hedbergellidae -> Asterohedbergella
Sister taxa: Asterohedbergella, Clavihedbergella, Costellagerina, Falsotruncana, Hedbergella, Helvetoglobotruncana, Liuenella, Microhedbergella, Muricohedbergella, Paracostellagerina, Paraticinella, Praeglobotruncana, Pseudoguembelitria, Whiteinella
Daughter taxa (time control age-window is: 0-800Ma)
Asterohedbergella asterospinosa

Asterohedbergella sp.
Specimens which cannot be assigned to established species

Taxonomy

Citation: Asterohedbergella Hamaoui 1965
Rank: Genus
Basionym: Hedbergella (Asterohedbergella)
Type species: Hedbergella (Asterohedbergella) asterospinosa Hamaoui, 1965

Original description: Test free, concavo-convex to unequally biconvex, trochospirally coiled throughout, spiral side evolute, umbilical side involute, with true umbilicus, with or without pseudoumbilicus, peripheral margin rounded to acute, without carina! band. At least each adult chamber drawn out at the periphery into a conical or flask-shaped, tapering extension which may produce a variably oriented true tubulospine, never inflated terminally. The earliest chambers may be subglobular. The surface of the test may be finely hispid. but without rugosities or costellae. Wall structure calcitic, radiate, finely perforate, lamellar. Aperture a low arch, interiomarginal, extraumbilical-umbilical, bordered by a narrow lip, but lacking tegilla.

Family Globotruncanidae; subfamily Rotaliporinae. Cenomanian. Monotypic.

Entries in the Catalog of original descriptions: Hedbergella (Asterohedbergella)

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 in a low trochospiral coil, early chambers globular, increasing rapidly in size, those of the final whorl pyriform to subconical and may terminate in a tubulospine, resulting in a stellate peripheral outline, umbilical side deeply excavated centrally, sutures radial, depressed, periphery angular but lacking an imperforate carinal band; wall calcareous, radiate, finely perforate, surface smooth to finely hispid but without costellae; aperture a low interiomarginal arch, extraumbilical-umbilical, bordered by a narrow lip.


Emended description:


Morphology:

Wall type:

Size:

Geological Range:
Last occurrence (top): at top of Cenomanian Stage (98% up, 94Ma, in Cenomanian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Cenomanian Stage (0% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database

Plot of range and occurrence data:

References:

Hamaoui, M. (1965). On a new subgenus of Hedbergella (Foraminiferida). Israel Journal of Earth Sciences. 13(3-4): 133-142. gs

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs


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Asterohedbergella compiled by the pforams@mikrotax project team viewed: 5-10-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110017 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (1)

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Le Coze

Hello,

I hope you are well.

The date of publication is 1965 not 1964 (error in L&T (1987)). Please see the type species herein with the correct date. No brackets needed around the authority when a subgenus is elevated to the genus rank.

Cheers,

Fran├žois

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Jeremy Young (London, UK)

Hi Francois

Thank you for those corrections - both now done.

all the best

Jeremy

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