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Globigerinelloides alvarezi


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides alvarezi
Sister taxa: G. algerianus, G. alvarezi, G. aptiensis, G. asper, G. barri, G. bentonensis, G. blowi, G. bollii, G. clavatus, G. duboisi, G. ehrenbergi, G. elongatus, G. escheri, G. ferreolensis, G. gottisi, G. impensus, G. lobatus, G. maridalensis, G. mendezensis, G. messinae, G. multispinus, G. paragottisi, G. praevolutus, G. prairiehillensis, G. pulchellus, G. sigali, G. subcarinatus, G. ultramicrus, G. yaucoensis, G. sp.,

Taxonomy

Citation: Globigerinelloides alvarezi (Eternod Olvera, 1959)
Rank: Species
Basionym: Planomalina alvarezi
Synonyms: Globigerinella tururensis;

Type images:

Original description: Planomalina alvarezi Eternod Olvera 1959:

Entries in the Catalog of original descriptions: Globigerinella tururensis;
Planomalina alvarezi;


Emended description: Test small, planispiral, biumbilicate, with a moderately lobate periphery; chambers inflated, globular, slightly overlapping, increasing gradually in size, 7 to 8 in the final whorl; wall finely perforate, smooth to finely hispid; aperture a moderately high arch at the base of the final chamber with a small lip and occasionally preserved relict apertures. [copied from Chronos database]

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within Maastrichtian Stage (66.04-72.05Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Circularchamber arrangement:Planispiraledge view:Equally biconvexaperture:Interiomarginal
umb chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
sp chbr shape:Inflatedumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:Relict
umbilical or test sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Moderately depresseddiameter mm:0.291width mm:breadth mm:
final-whorl chambers:7.0-8.0

References:

Eternod Olvera, Y., (1959). Foraminíferos del Cretácico Superior de la cuenca de Tampico-Tuxpan, Mexico. Associacion Mexicana Geólogos Petroleros, Boletin, 11: 61-134.


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Globigerinelloides alvarezi compiled by the pforams@mikrotax project team viewed: 23-11-2017

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