pforams@mikrotax - Globigerinelloides barri pforams@mikrotax - Globigerinelloides barri

Globigerinelloides barri


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides barri
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 barri (Bolli, Loeblich&Tappan, 1957)
taxonomic rank: Species
Basionym: Biglobigerinella barri
Synonyms:
Taxonomic discussion: This species shows some morphological variability mainly concerning (1) the number of chambers in the last whorl, (2) the absence/presence of one or more final twin chambers possibly resulting in (3) a double primary aperture. [copied from Chronos database]

Type images:

Original description: Test free, planispiral, biumbilicate, nearly involute to evolute; peripheral margin somewhat lobulate; chambers ovate to nearly spherical, 8-10 in the final planispiral whorl; in some specimen a smaller low but broad final chamber may cover a double-apertured penultimate chamber or there may be a small chamber at each side of the periphery, each covering one of the lateral apertures of the penultimate chamber; sutures distinct, depressed, radial in the early portion, becoming signoid in the later stages; wall calcareous, finely perforate, surface distinctly rugose I the early portion, later chambers nearly smooth or pitted; aperture interiomarginal, in the early stage equatorial, a low arch bordered above with a narrow lip, in the later stge there is a double aperture consisting of a small extraumbilical arch at each side of the last chamber, or one to each of the final paired chambers which may extend almost into the umbilicus, each aperture bordered by a lip.

Entries in the Catalog of original descriptions: Biglobigerinella barri, Biglobigerinella sigali

Character matrix
test outline:Subcircularchamber arrangement:Planispiraledge view:Equally biconvexaperture:Equatorial
sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:Strongly depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:7-9 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 G. blowi zone (120.55-124.40Ma, base in Barremian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Bolli, H. M., Loeblich, A. R. & Tappan, H. (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 3-50. gs

Chevalier, J. (1961). Quelques nouvelles espèces de Foraminifères dans le Crétacé inférieur méditerranéen. Revue de Micropaléontologie. 4(1): 30-36. gs

Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs

Verga, D. & Premoli Silva, I. (2003a). Early Cretaceous planktonic foraminifera from the Tethys: The large many-chambered representatives of the genus Globigerinelloides. Cretaceous Research. 24: 661-690. gs


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

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