Paracostellagerina libyca

Classification: pf_mesozoic -> Hedbergellidae -> Paracostellagerina -> Paracostellagerina libyca
Sister taxa: P. libyca, P. sp.,


Citation: Paracostellagerina libyca (Barr, 1972)
Rank: Species
Basionym: Hedbergella libyca
Synonyms: Hedbergella costellata

Type images:

Original description: "Test biconvex, low trochospiral, evolute, umbilicate, consisting of 3-31/2 whorls; equatorial periphery subcircular, moderately lobulate. Chambers globular, 5-7 (usually 6) in final whorl, uniformly and rapidly increasing in size. Sutures depressed, straight, radial. Umbilicus moderately broad. Aperture an interiomarginal, extraumbilical-umbilical, low arch bordered by well-developed portici. Wall calcareous perforate. Surface strongly rugose, becoming less rugose or hispid on final one or two chambers. Coiling predominantly dextral. Average maximum diameter 0.46 mm."

Entries in the Catalog of original descriptions: Hedbergella libyca, Hedbergella costellata

Geological Range:
Last occurrence (top): within T. globotruncanoides zone (96.08-100.50Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within P. appenninica zone (100.50-101.92Ma, 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

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Paracostellagerina libyca, synonyms included - Costellagerina libyca; Hedbergella costellata; Hedbergella libyca; Paracostellagerina libyca;
  • space-time plot :: Samples map :: Parent: Paracostellagerina

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick porticus
    umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
    spiral sutures:Moderately depressedumb depth:Deepwall texture:Finely muricateshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable


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

    Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs :: ::


    Paracostellagerina libyca compiled by the pforams@mikrotax project team viewed: 5-6-2020

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110380 Go to Archive.is to create a permanent copy of this page - citation notes

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