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Ventilabrella austinana


Classification: pf_mesozoic -> Heterohelicidae -> Ventilabrella -> Ventilabrella austinana
Sister taxa: V. austinana, V. eggeri, V. ornatissima, V. sp.,

Taxonomy

Citation: Ventilabrella austinana Cushman 1938
Rank: Species
Basionym: Ventilabrella austinana

Type images:

Original description: "Test with a large series of biserial chambers and but few expanded chambers in the adult, typically of but two rows, compressed; chambers globular in the later portion, uniformly increasing in size; sutures slightly depressed; wall smooth, punctate. Length 0.45 - 0.55 mm.; breadth 0.45 - 0.50 mm.; thickness 0.15 - 0.20 mm. "The species differs from V. eggeri in the fewer and larger adult chambers and smooth surface without costae."

Entries in the Catalog of original descriptions: Ventilabrella austinana

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian 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: Ventilabrella

    Character matrix

    test outline:Subtriangularchamber arrangement:Multiserialedge view:Compressedaperture:Multiple
    sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
    umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:N/A
    spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Cushman, J. A. (1938). Cretaceous species of Guembelina and related genera. Contributions from the Cushman Laboratory for Foraminiferal Research. 14: 2-28. gs


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    Ventilabrella austinana compiled by the pforams@mikrotax project team viewed: 25-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110567 Go to Archive.is to create a permanent copy of this page - citation notes



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