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Compactogerina stellapolaris


Classification: pf_mesozoic -> Conoglobigerinidae -> Compactogerina -> Compactogerina stellapolaris
Sister taxa: C. stellapolaris, C. sp.,

Taxonomy

Citation: Compactogerina stellapolaris (Grigelis, in Grigelis et al., 1977)
Rank: Species
Basionym: Globuligerina stellapolaris

Type images:

Original description: Globuligerina stellapolaris Grigelis 1977: Test small, trochoid, rounded, dorsal side a low trochospiral, ventral side involute. Two whorls, growth formula 3-4. Chambers round, tightly appressed. Sutures linear, slightly depressed. Aperture arcuate, interiomarginal. Wall coarsely perforate, thin, calcareous.

Entries in the Catalog of original descriptions: Globuligerina stellapolaris;

Geological Range:
Last occurrence (top): within Tithonian Stage (145.01-152.06Ma, top in Tithonian stage). Data source: [copied from Chronos database]
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian 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:Subcircularchamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
umb chamber shape:Globularcoiling axis:Moderateperiphery:N/Aaperture border:Thin lip
sp chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:N/A
umbilical or test sutures:Weakly depressedumb depth:Deepwall texture:Finely muricateshell porosity:Macroperforate: >2.5┬Ám
spiral sutures:Weakly depresseddiameter mm:0.25width mm:0.23breadth mm:0.18
final-whorl chambers:4.0-4.0

References:

Grigelis, A.A.; Mesezhnikov, M.S.Y.; akovleva, S.P. & Kozlova, G.E., (1977). First finds of planktonic foraminifera in the Upper Jurassic of the Pechora River Basin. Akademi Nauk SSSR Doklady, Geol., 233(5): 927.


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Compactogerina stellapolaris compiled by the pforams@mikrotax project team viewed: 23-11-2017

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