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Muricohedbergella holmdelensis


Classification: pf_mesozoic -> Hedbergellidae -> Muricohedbergella -> Muricohedbergella holmdelensis
Sister taxa: M. almadenensis, M. angolae, M. astrepta, M. atlantica, M. blakensis, M. crassa, M. delrioensis, M. flandrini, M. hoelzli, M. holmdelensis, M. implicata, M. kyphoma, M. loetterli, M. monmouthensis, M. planispira, M. portsdownensis, M. praelibyca, M. rosebudensis, M. sliteri, M. wondersi, M. sp.,

Taxonomy

Citation: Muricohedbergella holmdelensis (Olsson 1964)
Rank: Species
Basionym: Hedbergella holmdelensis Olsson 1964

Type images:

Original description: "Test very low trochospiral, nearly planispiral in appearance, much compressed; equatorial periphery strongly lobate; axial periphery rounded. Wall finely perforate, delicately hispid. Chambers five, occasionally six, in final whorl, increasing rather rapidly in size, moderately inflated, ovate, elongate in direction of coiling compressed ovate in axial view. Sutures depressed and gently curved on spiral side, depressed and radial on umbilical side. Aperture a low arch, interiomarginal, umbilical-extraumbilical, bordered by a thin lip; apertures of previously formed chambers open into the umbilicus. Greatest diameter of holotype 0.20 mm., greatest thickness 0.10 mm. Unfigured paratypes range from 0.15 to 0.24 mm. in maximum diameter, from 0.07 to 0.12 mm. in maximum thickness. Greatest diameter of figured paratype 0.26 mm., greatest thickness 0.10 mm. "

Entries in the Catalog of original descriptions: Hedbergella holmdelensis

Geological Range:
Last occurrence (top): within P0 zone (66.00-66.04Ma, top in Danian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. calcarata zone (75.71-76.18Ma, base in Campanian 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

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Muricohedbergella holmdelensis, synonyms included - Hedbergella holmdelensis;
  • space-time plot :: Samples map :: Parent: Muricohedbergella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Inflatedcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-6.0 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

    Olsson, R. K. (1964b). Late Cretaceous planktonic Foraminifera from New Jersey and Delaware. Micropaleontology. 10(2): 157-188. gs


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    Muricohedbergella holmdelensis compiled by the pforams@mikrotax project team viewed: 8-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110367 Go to Archive.is to create a permanent copy of this page - citation notes



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