Asterohedbergella

Daughter taxa (time control age-window is: 0-800Ma)
			Asterohedbergella asterospinosa
			Asterohedbergella sp. Specimens which cannot be assigned to established species

Taxonomy

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.

Geological Range:
Last occurrence (top): at top of R. cushmani zone (100% up, 94Ma, in Cenomanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Total of ranges of species in this database

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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Hedbergellidae

Asterohedbergella compiled by the pforams@mikrotax project team viewed: 11-10-2024 Taxon Search: Advanced Search 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

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Comments (2)

 

 

 

 

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Le Coze

Posts: 147

Since: Aug 2017

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,

François

29 July 2022 15:24

Jeremy Young

Posts: 535

Since: Jan 2017

Jeremy Young(UK)

Hi Francois

Thank you for those corrections - both now done.

all the best

Jeremy

1 August 2022 21:39

 

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