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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. saundersi, G. sigali, G. subcarinatus, G. ultramicrus,

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]
Similar species: "Differs from G. prairiehillensis Pessagno by having (1) a smooth, polished rather than papillose test wall; (2) a more compressed test with with chambers that only gradually increase in size; (3) shallow rather than deep umbilici; (4) a more highly arched primary aperture; and (5) a smaller test size.
Differs from G. ehrenbergi (Barr) by having a more compressed, polished test with a higher equatorial aperture." [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:

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:Circularcoiling axis:N/Achamber arrangement:Planispiralumbilicus:Wide
edge view:Hourglassumbilical or test sutures:Moderately depressedspiral sutures:N/Ashell porosity:Finely Perforate: 1-2.5
wall texture:Smoothaperture:Equatorialaperture border:Thin lipaccessory apertures:None
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Moderately rounded
umb depth:Shallowdiameter 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.


Globigerinelloides bollii compiled by the pforams@mikrotax project team viewed: 23-5-2017

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