Globigerinelloides bentonensis

Classification: pf_mesozoic -> Globigerinelloididae -> Globigerinelloides -> Globigerinelloides bentonensis
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.,


Citation: Globigerinelloides bentonensis (Morrow, 1934)
Rank: Species
Basionym: Anomalina bentonensis
Synonyms: Planomalina caseyi
Taxonomic discussion: Comparison of the SEM images of the holotypes of G. bentonensis and G. caseyi reveal that both species have a relatively smooth surface texture, a weakly lobate test outline, a moderately gradual rate of chamber size increase, and a low arched aperture at the base of the final chamber. Paratypes of G. caseyi have between 8 and 9 chambers in the final whorl, which overlaps the final whorl chamber number described for G. bentonensis. For this reason these species are considered synonymous with G. bentonensis designated as the senior synonym because of priority. [copied from Chronos database]

Type images:

Original description: Anomalina bentonensis Morrow 1934: "Test small, nearly symmetrical, slightly involute, periphery broadly rounded, earlier whorls partly exposed on both sides at the center; chambers inflated, increasng rather rapidly in size as added, quite uniform in shape, numbering 7-9 in last whorl; sutures strongly impressed, usually curving backward as they pass over the periphery; wall conspicuously perforated; aperture peripheral passing onto the dorsal side."

Entries in the Catalog of original descriptions: Anomalina bentonensis;
Planomalina caseyi;

Geological Range:
Last occurrence (top): within R. cushmani zone (94.03-95.94Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within T. primula zone (107.39-111.84Ma, base in Albian 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:Ellipticalchamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
umb chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
sp chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:
spiral sutures:Moderately depresseddiameter mm:max. of holotype 0.40 mmwidth mm:breadth mm:max 0.20 mm
final-whorl chambers:7.0-9.0


Morrow, A.L., (1934). Foraminifera and ostracoda from the Upper Cretaceous of Kansas. Journal of Paleontology, 8: 186-205.


Globigerinelloides bentonensis compiled by the pforams@mikrotax project team viewed: 20-1-2018

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