bforams@mikrotax - Nuttallinella coronula bforams@mikrotax - Nuttallinella coronula

Nuttallinella coronula

NB This site is under active development, current content in the main database is primarily from Bolli et al 1994, Hayward et al. 2012, Holbourn et al. 2013, Holbourn and Kaminski 1997, Alegret & Thomas 2001, and Katz et al. 2003. It is intended to expand and develop this to provide rather comprehensive coverage of Mesozoic and Cenozoic deep-sea benthic foraminifera.


Classification: bf_main -> Rotaliana -> Asterigerinoidea -> Nuttallinella -> Nuttallinella coronula
Sister taxa: N. coronula, N. florealis, N. sp.

Taxonomy

Citation: Nuttallinella coronula (Belford) 1958
Taxonomic rank: species
Basionym: Nuttallina coronula Belford 1958
Synonyms:
Taxonomic discussion: This species differs from N. florealis (White) by its broader keel and the more compressed test. [Alegret & Thomas 2001]

Catalog entries: Nuttallina coronula

Type images:

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Morphology:

Test low trochospiral, planoconvex, periphery acute with a broad and sharp keel; test much compressed with a rounded outline. Dorsal side flat and evolute, sutures curved; the central part is raised in specimens with a slightly concave dorsal side; all chambers visible on dorsal side. Ventral side involute and slightly convex, about seven chambers visible in the last whorl; sutures sinuate and depressed. Umbilicus small and open. Aperture a long and narrow interiomarginal slit extending from the periphery to the umbilicus. Apertural face very low. Test calcareous, smooth. [Alegret & Thomas 2001]

Search data:
Final whorl chambers: ->0
The morphological data given here can be used on the advanced search page. See also these notes

Biogeography and Palaeobiology


Geographic distribution

N. coronulais a rare species in the Mendez and Velasco Formation in all sections except Los Ramones, where it is common, and section La Ceiba, where it is abundant. [Alegret & Thomas 2001]


Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleocene Epoch (55.96-66.04Ma, top in Thanetian stage). Data source: included in Alegret & Thomas (2001) so occurs in the Paleocene, but may extend significantly higher
First occurrence (base): within Campanian-Maastrichtian stage-pair (66.04-83.65Ma, base in Campanian stage). Data source: included in Alegret & Thomas (2001) so occurs in the end Cretaceous, but may extend significantly lower

Plot of occurrence data:
NB The ranges given for genera and higher taxa are the total ranges of species included in that taxon in this database - so the true total range of the taxon will usually be longer

Primary source for this page: Alegret & Thomas 2001

References:

Alegret, L. & Thomas, E. (2001). Upper Cretaceous and lower Paleogene benthic foraminifera from northeastern Mexico. Micropaleontology. 47(4): 269-316. gs

Belford, D. J. (1958). The Genera Nuttallides Finlay 1939, and Nuttallina n. gen. Contributions from the Cushman Foundation for Foraminiferal Research. 9(4): 93-98. gs

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Nuttallinella coronula compiled by the bforams@mikrotax project team viewed: 15-7-2026

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