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Microhedbergella renilaevis


Classification: pf_mesozoic -> Hedbergellidae -> Microhedbergella -> Microhedbergella renilaevis
Sister taxa: M. albiana, M. intermedia, M. miniglobularis, M. praeplanispira, M. pseudodelrioensis, M. pseudoplanispira, M. pseudotrocoidea, M. renilaevis, M. rischi, M. sp.,

Taxonomy

Citation: Microhedbergella renilaevis Huber & Leckie 2011
Rank: Species
Basionym: Microhedbergella renilaevis

Type images:

Original description: Test wall microperforate with randomly scattered pores averaging 0.8 microns in diameter, surface smooth. Test small, low to rarely moderately low trochospiral, equatorial periphery subrounded, moderately to strongly lobate; weakly biconvex; chambers subglobular, usually reniform in equatorial view and a slightly compressed oval shape in edge view, dextrally or sinistrally coiled in two whorls of from 8 to 11 chambers that increase moderately in size, usually with 4, rarely 3 and up to 5.5 chambers in the final whorl; sutures depressed, radial, straight; umbilicus shallow, moderately wide, averaging 24% of the test diameter; aperture an extraumbilical low arch that extends from the equatorial peripheral margin almost to the umbilicus, bordered by a narrow lip that usually broadens to an imperforate portical flap that may partly cover the umbilicus, with relict portici surrounding the umbilicus.

Entries in the Catalog of original descriptions: Microhedbergella renilaevis

Geological Range:
Last occurrence (top): within T. primula zone (107.39-111.84Ma, top in Albian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of M. renilaevis zone (0% up, 113.1Ma, in Aptian 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

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

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:Extraumbilical
    sp chamber shape:Globularcoiling axis:Low-moderateperiphery:aperture border:Thin lip
    umb chbr shape:umbilicus:Wideperiph margin shape:accessory apertures:Relict
    spiral sutures:umb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1┬Ám
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.0-5.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gs


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    Microhedbergella renilaevis compiled by the pforams@mikrotax project team viewed: 15-11-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110354 Go to Archive.is to create a permanent copy of this page - citation notes



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