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Globigerinelloides bollii


Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides bollii
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 bollii Pessagno 1967
Rank: Species
Basionym: Globigerinelloides bollii
Taxonomic discussion: Early chambers spherical while late chambers are ovoid, chambers increase only gradually in size, shallow rather than deep umbilici, more arched primary aperture and smaller than G. prairiehillensis, surface smooth, polished, and finely perforate, never spinose/papilose. [copied from Chronos database]

Type images:

Original description: Globigerinelloides bollii Pessagno 1967: "Test planispiral, lobate, biumbilicate with 6-7 somewhat compressed chambers in the last whorl. Chambers of earlier whorls spherical; chambers of last whorl ovoidal, expanding gradually in size. Test surface smooth, polished, and finely perforate; never spinose or papillose. Sutures straight, radial, and somewhat depressed. Umbilici large and shallow. Primary aperture equatorial in position; a moderately high arch at the base of the last chamber, leading into both umbilical areas. Relict apertures well developed near the suture junctions to umbilicus; covered by flaplike structures. Outer wall structures radial byaline perforate. Relict apertural flaps and septal walls microgranular hyaline."

Entries in the Catalog of original descriptions: Globigerinelloides bollii;


Size: Diameter Holotype #689272: 0.256 mm; Paratype #689271A: 0.242 mm; Paratype #689271B: 267 mm

Geological Range:
Last occurrence (top): within G. gansseri zone (71.75-72.97Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. concavata zone (86.71-89.91Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

Character matrix

test outline:Circularchamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
umb chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
sp chbr shape:Inflatedumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5┬Ám
spiral sutures:N/Adiameter mm:0.26width mm:N/Abreadth mm:0.1
final-whorl chambers:6.0-7.0

References:

Pessagno, E.A., Jr., (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontograph. Americana, 5: 245-445.


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Globigerinelloides bollii compiled by the pforams@mikrotax project team viewed: 23-1-2018

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