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Microhedbergella miniglobularis


Classification: pf_mesozoic -> Hedbergellidae -> Microhedbergella -> Microhedbergella miniglobularis
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 miniglobularis Huber & Leckie 2011
Rank: Species
Basionym: Microhedbergella miniglobularis

Type images:

Original description: Test wall microperforate, pore diameter ranging 0.4 to 0.8 microns, surface smooth or with very fine pustules. Test very small, coiled in a low to rarely moderate trochospire, equatorial periphery moderately to strongly lobate, unequally biconvex, test thickness:diameter ratio averaging 0.61; chambers inflated, dextrally or sinistrally coiled in 1.5 to 2 whorls of 6 to 8 chambers that increase rapidly in size with 3 to 4 chambers in the final whorl, ultimate:penultimate ratio averaging 1.1, final chamber slightly reniform; sutures depressed, radial, straight; umbilicus shallow, narrow; aperture an extra-umbilical low arch that extends from near the peripheral margin nearly to the umbilicus, bordered by a narrow lip.

Entries in the Catalog of original descriptions: Microhedbergella miniglobularis

Geological Range:
Last occurrence (top): within M. renilaevis zone (112.96-113.14Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): near top of P. rohri zone (91% up, 113.7Ma, 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:Inequally biconvexaperture:Extraumbilical
    sp chamber shape:coiling axis:Low-moderateperiphery:aperture border:Thin lip
    umb chbr shape:umbilicus:Narrowperiph margin shape:accessory apertures:
    spiral sutures:umb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1┬Ám
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.0-4.0 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 miniglobularis compiled by the pforams@mikrotax project team viewed: 22-11-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110349 Go to Archive.is to create a permanent copy of this page - citation notes



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