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Muricohedbergella portsdownensis


Classification: pf_mesozoic -> Hedbergellidae -> Muricohedbergella -> Muricohedbergella portsdownensis
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 portsdownensis (Williams-Mitchell, 1948)
Rank: Species
Basionym: Globigerina portsdownensis
Taxonomic discussion: Eicher and Worstell (1970) have SEM of this species w/ umbilical aperture; may be bosquensis. [copied from Chronos database]

Type images:

Original description: Test free, trochoid; chambers globular (11-12 in the dorsal spire), not closely appressed, often the last chamber appearing to be almost detached in the adult stage; wall hyaline, finely perforate and cancellate; aperture small and indistinct, opening into the umbilicus.

Entries in the Catalog of original descriptions: Globigerina portsdownensis

Geological Range:
Last occurrence (top): within Cenomanian Stage (93.90-100.50Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian 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 portsdownensis, synonyms included - Hedbergella portsdownensis;
  • space-time plot :: Samples map :: Parent: Muricohedbergella

    Character matrix

    test outline:Circularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Globularcoiling axis:Moderateperiphery:N/Aaperture border:N/A
    umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Coarsely muricateshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Eicher, D. L. & Worstell, P. (1970). Lunatriella, a Cretaceous heterohelicid foraminifer from the western interior of the United States. Micropaleontology. 16(1): 117-121. gs

    Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs

    Williams-Mitchell, E. (1948). The zonal value of foraminifera in the Chalk of England. Geology. 59: 96-. gs


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    Muricohedbergella portsdownensis compiled by the pforams@mikrotax project team viewed: 20-1-2020

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110373 Go to Archive.is to create a permanent copy of this page - citation notes



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