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Globigerinelloides algerianus


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides algerianus
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 algerianus Cushman and ten Dam 1948
Rank: Species
Basionym: Globigerinelloides algerianus
Taxonomic discussion: From Verga and Premoli Silva (2003): "Globigerinelloides algerianus displays a moderate morphological variability regarding the number of chambers of the outer whorl (from 10 to 12), more or less loosely coiling, and the peripheral outline ranging from subcircular to more or less ovoid and more or less lobate." [copied from Chronos database]

Type images:

Original description: Globigerinelloides algerianus Cushman and ten Dam 1948: Test planispirally coiled, the sides concave, periphery broadly rounded, in the adult stage becoming somewhat loosely coiled; chambers distinct, globular, 10-12 in the last-formed coil, increasing very gradually and evenly in size as added, in the last-formed portion with somewhat triangular projections at each side coming to a point above the middle of the preceding coil; sutures distinct, depressed, in the earlier stages nearly radial, later somewhat signoid; wall calcareous finely perforate, the surface somewhat rugose; aperture a small, arched opening in the median line at the base of the apertural face. Diameter 0.55-0.70 mm. thickness 0.15-0.18 mm. The species is rather common at the type locality.

Entries in the Catalog of original descriptions: Globigerinelloides algerianus;

Geological Range:
Last occurrence (top): at top of G. algerianus zone (100% up, 118.9Ma, in Aptian stage). Data source: zonal marker (from Timescale Creator)
First occurrence (base): at base of G. algerianus zone (0% up, 122.2Ma, in Aptian 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:Compressedaperture:Equatorial
umb chamber shape:N/Acoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
sp chbr shape:N/Aumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
umbilical or test sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5┬Ám
spiral sutures:Moderately depresseddiameter mm:0.58width mm:breadth mm:0.19
final-whorl chambers:10.0-12.0

References:

Cushman, J.A. & Ten Dam, A., (1948). Globigerinelloides, a new genus of the Globigerinidae. Contributions from the Cushman Laboratory for Foraminiferal Research, 24(2): 42-43.


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Globigerinelloides algerianus compiled by the pforams@mikrotax project team viewed: 19-10-2017

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