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Globigerinelloides blowi


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides blowi
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 blowi (Bolli, 1959)
Rank: Species
Basionym: Planomalina blowi
Synonyms: Globigerinelloides macrocameratus; Globigerinelloides texomaensis
Taxonomic discussion: Globigerinelloides blowi displays a relatively wide morphological variability mainly regarding (1) the number of chambers of the outer whorl ranging from 4.5 to 6 (usually 5 to 5.5), (2) their shape from spherical to slightly reniform in lateral view, (3) the more or less slightly lobate equatorial periphery, and (4) the more or less depressed and wide umbilical area. [copied from Chronos database]

Type images:

Original description: Planomalina blowi Bolli 1959: Shape of test planispiral, biumbilicate, involute, distinctly lobate. Wall calcareous, finely perforate. Chambers spherical, 4-5 in the last whorl, increasing rapidly in size; those of the earlier whorls usually not visible. Sutures radial, deeply depressed. Aperture a long, low slit, bordered by a rim or lip; equatorial. Relict apertures of earlier chambers of last whorl present but often not clearly visible in examined material.

Entries in the Catalog of original descriptions: Globigerinelloides macrocameratus;
Globigerinelloides texomaensis;
Planomalina blowi;

Geological Range:
Last occurrence (top): within G. algerianus zone (118.93-122.17Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of G. blowi zone (0% up, 128.7Ma, in Barremian stage). Data source: zonal marker (from Timescale Creator)

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:Lobatechamber arrangement:Planispiraledge view:aperture:Equatorial
umb chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
sp chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Relict
umbilical or test sutures:Strongly depressedumb depth:Deepwall texture:Finely pustuloseshell porosity:
spiral sutures:Strongly depresseddiameter mm:0.31width mm:breadth mm:0.14
final-whorl chambers:4.0-5.0

References:

Bolli, H.M., (1959). Planktonic foraminifera as index fossils in Trinidad, West Indies and their value for worldwide stratigraphic correlation. Eclogae Geologicae Helvetiae, 52(2): 627-639.

Bolli, H.M., (1959). Planktonic foraminifera from the Cretaceous of Trinidad, B. W. I. Bulletins of American Paleontology, 39(179): 253-277.

Bolli, H.M., (1959). Grimsdaleinella, a new genus of the foraminiferal family Heterohelicidae. Eclogae Geologicae Helvetiae, 52(1): 1-4.


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Globigerinelloides blowi compiled by the pforams@mikrotax project team viewed: 19-11-2017

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