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Microhedbergella pseudoplanispira


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

Type images:

Original description: Test wall microperforate, pores randomly scattered and averaging 0.9 mm in diameter, wall surface smooth. Test small, very low trochospiral, equatorial periphery rounded, weakly lobate in equatorial outline; chambers subglobular, increasing slowly in size, ultimate: penultimate chamber ratio averaging 1.05, dextrally or sinistrally coiled in 2 whorls with 6.5 to 7 chambers in the final whorl; sutures moderately depressed in last several chambers, weakly depressed to flush on earlier chambers, radial on umbilical and spiral sides; umbilicus shallow, comprising 26 to 30% of the test diameter; aperture an extraumbilical low arch that extends from near the equatorial peripheral margin nearly to the umbilicus, bordered by a narrow lip, with relict apertural lips surrounding the umbilicus.

Entries in the Catalog of original descriptions: Microhedbergella pseudoplanispira

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): within M. rischi zone (112.40-112.96Ma, base in Albian 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: Microhedbergella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:Extraumbilical
    sp chamber shape:coiling axis:Lowperiphery:aperture border:Thin lip
    umb chbr shape:umbilicus:periph margin shape:Moderately roundedaccessory apertures:Relict
    spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1┬Ám
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.5-7.0 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 pseudoplanispira compiled by the pforams@mikrotax project team viewed: 12-11-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110352 Go to Archive.is to create a permanent copy of this page - citation notes



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