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Praeglobotruncana shirakinensis


Classification: pf_mesozoic -> Hedbergellidae -> Praeglobotruncana -> Praeglobotruncana shirakinensis
Sister taxa: P. algeriana, P. clotensis, P. compressa, P. delrioensis, P. gibba, P. hilalensis, P. inermis, P. kalaati, P. oraviensis, P. pseudoalgeriana, P. shirakinensis, P. stephani, P. sp.,

Taxonomy

Citation: Praeglobotruncana shirakinensis Hasegawa 1999
Rank: Species
Basionym: Praeglobotruncana shirakinensis

Type images:

Original description: Diagnosis.- A medium trochospiral species of Praeglobotruncana with about 5 moderately compressed and slightly lobulated chambers of last whorl.

Description.- Test of medium size, medium trochospiral, equatorial periphery slightly lobulate; chambers initiallly inflated and globigerine-like, later ones becoming petaloidal on dorsal side, trapezoidal in shape on ventral side, about 10 to 12 chambers in all arranged into about 2.5 whorls, enlaraging gradually in size as added, about 5 slightly compressed chambers in final whorl, with a perpheral band formed of an aligned concentration of pustules paralleling periphery; sutures on dorsal side curved, raised and beaded, ventrally radial or slightly curved, depressed; umbilicus shallow and narrow, its width about 1/4 of maximum diameter of test; primary aperture bordered by a wide distinct lip, interiomarginal, umbilical-extraumbilical, extending nearly halfway to periphery; wall calcareous, with marked accumulation of pustules on early chambers.

Entries in the Catalog of original descriptions: Praeglobotruncana shirakinensis

Geological Range:
Last occurrence (top): within Cenomanian Stage (93.90-100.50Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian 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

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Praeglobotruncana

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:
    sp chamber shape:coiling axis:Moderateperiphery:aperture border:
    umb chbr shape:umbilicus:periph margin shape:accessory apertures:
    spiral sutures:umb depth:wall texture:shell porosity:
    umbilical or test sutures:final-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Hasegawa, T. (1999). Planktonic foraminifera and biochronology of the Cenomanian-Turonian (Cretaceous) sequence in the Ohyubari area, Hokkaido, Japan. Paleontological Research. 3: 173-192. gs :: ::


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    Praeglobotruncana shirakinensis compiled by the pforams@mikrotax project team viewed: 8-7-2020

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110436 Go to Archive.is to create a permanent copy of this page - citation notes



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