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Microhedbergella praeplanispira


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

Type images:

Original description: Test wall microperforate (0.8 to 1.2 mm), pores randomly scattered, surface smooth to weakly pustulose, very rarely observed with scattered perforation cones. Test small, low trochospiral, spiral side flat to slightly depressed, equatorial periphery rounded, moderately lobate in equatorial outline, test thickness:diameter ratio averaging 0.49; chambers globular, increasing gradually in size, ultimate: penultimate chamber ratio averaging 1.12, dextrally or sinistrally coiled in 2.5 whorls with 5.5 to 7 chambers in the final whorl; sutures moderately depressed, radial on umbilical and spiral sides; umbilicus shallow, comprising 21 to 26 percent 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 that usually broadens to an imperforate apertural flap extending toward the umbilicus, often with relict apertural flaps surrounding the umbilicus.

Entries in the Catalog of original descriptions: Microhedbergella praeplanispira

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:
    spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1┬Ám
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.5-7.0 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 praeplanispira compiled by the pforams@mikrotax project team viewed: 13-11-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110350 Go to Archive.is to create a permanent copy of this page - citation notes



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