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Globigerinelloides clavatus


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides clavatus
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 clavatus (Verga and Premoli Silva, 2005)
Rank: Species
Basionym: Globigerinelloides paragottisi clavatus Verga and Premoli Silva, 2005
Taxonomic discussion: . Globigerinelloides paragottisi clavatus shows a little morphological variability mainly regarding (a) the number of chambers of the outer whorl ranging from 5 to 5.5, (b) the involution of the test (varying from evolute to slightly semi-involute), (c) the number of clavate chambers and (d) their elongation and consequently (e) the shape of the periphery which can be more or less strongly lobate. [copied from Chronos database]

Type images:

Original description: Globigerinelloides paragottisi clavatus (Verga and Premoli Silva 2005): Test small to medium, planispiral, evolute to semi-involute and laterally inflated; 2 to 2.5 whorls; 5 to 5.5 chambers in the outer whorl increasing rapidly and gradually in size as added; first chambers spherical to subspherical, the last two or three radially elongate; equatorial periphery ovoid and strongly lobate; sutures straight to slightly curved, radial and depressed; umbilical area rather small and shallow; aperture straddling the periphery as a low to medium arc possibly bordered by a thin lip; relict openings at time observed. Wall smooth finely perforate.

Entries in the Catalog of original descriptions: Globigerinelloides paragottisi clavatus;

Geological Range:
Last occurrence (top): within T. bejaouaensis zone (113.26-118.02Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. algerianus zone (118.93-122.17Ma, base in Aptian 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:Strongly lobatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
umb chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
sp chbr shape:Elongateumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
umbilical or test sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:-
spiral sutures:Strongly depresseddiameter mm:0.39width mm:breadth mm:0.16
final-whorl chambers:5.0-5.5

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.


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Globigerinelloides clavatus compiled by the pforams@mikrotax project team viewed: 11-12-2017

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