pforams@mikrotax - Globigerinelloides sigali pforams@mikrotax - Globigerinelloides sigali

Globigerinelloides sigali


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides sigali
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 sigali Longoria, 1974
taxonomic rank: Species
Basionym: Globigerinelloides sigali Longoria, 1974
Taxonomic discussion: Globigerinelloides sigali displays wide morphological variability mainly regarding (a) the number of chambers of the outer whorl ranging from 4 to 4.5, (b) the involution of the test (varying from slightly semi-involute to evolute), (c) the number of clavate chambers, (d) their elongation and consequently (e) the shape of the equatorial periphery that can be more or less strongly lobate. [copied from Chronos database]

Type images:

Original description: Test small to medium, planispiral, evolute to semi-involute; 2 to 2.5 whorls; 4-4.5 chambers in the outer whorl increasing gradually and rather slowly in size as added except the last two or, exceptionally, three growing more rapidly; first chambers spherical to subspherical, the last two or three radially elongate and round; equatorial periphery cross-shaped 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 arch possibly bordered by a thin lip; relict openings at time observed. Wall smooth finely perforate.

Entries in the Catalog of original descriptions: Globigerinelloides sigali

Character matrix
test outline:Stellatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:-
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within L. cabri zone (119.05-120.55Ma, 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:

Lipson-Benitah, S. & Almogi-Labin, A. (2004). Aptian planktonic foraminifera from Israel. Israel Journal of Earth Sciences. 53(1): 27-46. gs

Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs


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

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