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Praeglobotruncana hilalensis


Classification: pf_mesozoic -> Hedbergellidae -> Praeglobotruncana -> Praeglobotruncana hilalensis
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 hilalensis Barr 1972
Rank: Species
Basionym: Praeglobotruncana hilalensis

Type images:

Original description: "Test plano-convex, low to moderatly high trochospiral, evolute, umbilicate, consisting of 3-3.5 whorls; equatorial periphery generally circular, weakly lobulate with a weak to well-beaded peripheral keel. Chambers petaloid, inflated, 5-6 in final whorl, uniformly and rapidly increasing in size. Dorsal sutures slightly raised, weakly beaded, curved; ventral sutures depressed, radial. Umbilicus moderately broad. Aperture interiomarginal, extraumbilical-umbilical, bordered by an apertural lip. Wall calcareous perforate. Surface finely rugose to hispid. Coiling predominantly dextral. Average max. diameter 0.60 mm."

Entries in the Catalog of original descriptions: Praeglobotruncana hilalensis

Geological Range:
Last occurrence (top): within D. concavata zone (86.71-89.91Ma, top in Coniacian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.91-92.56Ma, 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

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

    Character matrix

    test outline:Subcircularchamber arrangement:Trochospiraledge view:aperture:Umbilical-extraumbilical
    sp chamber shape:Subrectangularcoiling axis:Moderateperiphery:Single keelaperture border:Thin porticus
    umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
    spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Barr, F. T. (1972a). Cretaceous biostratigraphy and planktonic foraminifera of Libya. Micropaleontology. 18(1): 1-46. gs


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    Praeglobotruncana hilalensis compiled by the pforams@mikrotax project team viewed: 30-1-2020

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110431 Go to Archive.is to create a permanent copy of this page - citation notes



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