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Rectoguembelina cretacea


Classification: pf_mesozoic -> Heterohelicidae -> Rectoguembelina -> Rectoguembelina cretacea
Sister taxa: R. cretacea, R. sp.,

Taxonomy

Citation: Rectoguembelina cretacea Cushman 1932
Rank: Species
Basionym: Rectoguembelina cretacea

Type images:

Original description: "Test consisting of two unequal portions, the early portion consisting of several pairs of globular chambers arranged as in Guembelina, the adult stage uniserial, formed usually by three subglobular or slightly pyriform chambers, slightly overlapping, the apertural end extended out into a tapering neck; sutures distinct, depressed; wall smooth, translucent, very finely perforate; aperture circular, at the end of the tubular neck. Length 0.25-0.35 mm; breadth 0.08-0.10 mm; thickness 0.05-0.07 mm."

Entries in the Catalog of original descriptions: Rectoguembelina cretacea

Geological Range:
Last occurrence (top): within P2 zone (62.29-62.60Ma, top in Danian stage). Data source: [copied from Chronos database]
First occurrence (base): within A. mayaroensis zone (67.30-69.18Ma, base in Maastrichtian 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: Rectoguembelina

    Character matrix

    test outline:Elongatechamber arrangement:Biserialedge view:Equally biconvexaperture:Terminal
    sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:N/A
    umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:N/A
    spiral sutures:Moderately depressedumb depth:N/Awall texture:Smoothshell porosity:
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:1.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Cushman, J. A. (1932). Rectoguembelina, a new genus from the Cretaceous. Contributions from the Cushman Laboratory for Foraminiferal Research. 8: 4-7. gs


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    Rectoguembelina cretacea compiled by the pforams@mikrotax project team viewed: 14-11-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110490 Go to Archive.is to create a permanent copy of this page - citation notes



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