pforams@mikrotax - Globigerinelloides elongatus pforams@mikrotax - Globigerinelloides elongatus

Globigerinelloides elongatus


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides elongatus
Sister taxa: G. clavatus, G. gyroidinaeformis ⟩⟨ G. algerianus, G. aptiensis, G. barri, G. ferreolensis ⟩⟨ G. blowi, G. duboisi, G. maridalensis, G. paragottisi ⟩⟨ G. elongatus, G. lobatus, G. sigali, G. sp.

Taxonomy

Citation: Globigerinelloides elongatus Verga&Premoli Silva, 2005
taxonomic rank: Species
Basionym: Globigerinelloides maridalensis elongatus Verga and Premoli Silva, 2005
Taxonomic discussion: This species shows a moderate morphological variability mainly concerning (a) the number of chambers in the last whorl ranging from 4 to 5, (b) the elongation of the last two/three chambers and, consequently, (c) the shape of the test that can be more or less strongly lobate to stellate. [Verga & Premoli Silva 2005]

Type images:

Original description: Test small to medium, planispiral, semi-involute to evolute, slightly laterally compressed; 2 to 2.5 whorls; 4 to 5 chambers in the outer whorl, increasing in size gradually but rather quickly as added; first chambers globular to subglobular, the last two or exceptionally three radially elongate, posteriorly directed, slightly compressed; equatorial periphery strongly lobate to stellate; sutures straight to slightly curved, radial and depressed; umbilicus rather small and shallow; aperture straddling the periphery as a low arch possibly bordered by a thin lip; relict apertures at time observed. Wall smooth finely perforate.

Entries in the Catalog of original descriptions: Globigerinelloides maridalensis elongatus

Character matrix
test outline:Stellatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Elongateumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4-5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within G. algerianus zone (116.86-118.24Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within L. cabri zone (119.05-120.55Ma, base in Aptian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Verga, D. & Premoli Silva, I. (2005). Early Cretaceous planktonic Foraminifera from the Tethys; the upper Aptian, planispiral morphotypes with elongate chambers. Cretaceous Research. 26(2): 239-259. gs


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Globigerinelloides elongatus compiled by the pforams@mikrotax project team viewed: 18-7-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110131 Go to Archive.is to create a permanent copy of this page - citation notes



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