Pseudoguembelina hariaensis

Classification: pf_mesozoic -> Heterohelicidae -> Pseudoguembelina -> Pseudoguembelina hariaensis
Sister taxa: P. costellifera, P. costulata, P. excolata, P. hariaensis, P. kempensis, P. palpebra, P. semicostata, P. sp.,


Citation: Pseudoguembelina hariaensis Nederbragt 1991
Rank: Species
Basionym: Pseudoguembelina hariaensis
Taxonomic discussion: Distinguished by initially rapidly flaring test, later test with subparallel sides; finely costate test with compressed multiserial chamberlets. Nederbragt, 1991, p. 360: "While lacking accessory apertures, the above described form is included in Pseudogeumbelina because of its suspected phylogenetic relation with Psg. palpebra. Pseudoguembelina hariaensis most closely resembles Psg. palpebra specimens with terminal multiserial growth, in which accessory apertures are usually lacking also (pl. 9, figs. 11., 12). Pseudoguembelina hariaensis differs from such Psg. palpebra forms in having thinner costae, less inflated chambers and more sets of multiserial chamberlets." [copied from Chronos database]

Type images:

Original description: Test biserial throughout or followed by one or two, rarely more, sets of small multiserial chamberlets. Biserial part of the test flaring throughout, or rapidly flaring in the juveniles, with sides of last few pairs of biserial chambers becoming subparallel. Biserial chambers subglobular, wider than high or deep, multiserial chamberlets globular. Periphery rounded, at most faintly lobate in the adult. Surface covered by thin, discontinuous costae, with rows of medium sized pores in between; sutures flush to slightly depressed, often imperforate. Apertures high and narrow arcs, bordered by small, but distinct flanges.

Entries in the Catalog of original descriptions: Pseudoguembelina hariaensis

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.30Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of P. hariaensis zone (0% up, 67.3Ma, in Maastrichtian stage). Data source: zonal marker (from Timescale Creator)

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: Pseudoguembelina hariaensis, synonyms included - Pseudoguembelina hariaensis;
  • space-time plot :: Samples map :: Parent: Pseudoguembelina

    Character matrix

    test outline:Subtriangularchamber arrangement:Multiserialedge view:Compressedaperture:Interiomarginal
    sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:Sutural
    spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable


    Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs :: ::


    Pseudoguembelina hariaensis compiled by the pforams@mikrotax project team viewed: 14-7-2020

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110453 Go to Archive.is to create a permanent copy of this page - citation notes

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