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Muricohedbergella planispira


Classification: pf_mesozoic -> Hedbergellidae -> Muricohedbergella -> Muricohedbergella planispira
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 planispira (Tappan, 1940)
Rank: Species
Basionym: Globigerina planispira
Synonyms: Praeglobotruncana hansbollii
Taxonomic discussion: Petrizzo & Huber, 2006, JFR 36:185: Re-examination of the type material deposited at the Smithsonian Museum of Natural History, Washington, D.C. (USNM 25113; see Plate 7, figs. 1a-c) showed that the test surface of H. planispira is not entirely smooth as stated in the original description (Tappan, 1940), and common pustules are irregularly scattered on the early outer surface chambers, then they gradually decrease on the last ones. Small, smooth-walled hedbergellids from within the so-called Hedbergella planispira Zone of the early Albian that have previously been attributed to H. planispira should no longer be included in this species. [Huber & Leckie, 2011, p. 84]: [copied from Chronos database]

Type images:

Original description: Test tiny, in a low trochospiral spire of 2 volutions; chambers 6-7 in a whorl, increasing rapidly in size, bulbous; sutures distinct and constricted; wall calcareous, surface smooth; aperture opening into a deep umbilical excavation.

Entries in the Catalog of original descriptions: Globigerina planispira, Praeglobotruncana hansbollii


Emended description: Petrizzo & Huber, 2006, JFR 36:185: Test low trochospiral, equatorial outline circular and slightly lobulate, peripheral margin rounded; wall macroperforate with irregularly distributed pustules more developed on the earlier chambers of the last whorl, last chamber smooth; chambers globular, 6 to 8 increasing slowly in size as added; primary aperture umbilical-extraumbilical extended to the periphery and bordered by a narrow lip; sutures straight and depressed on both sides. [Huber & Leckie, 2011, p. 84]: Test wall finely perforate with pores up to 2 mm in diameter, surface of all but last chamber densely covered by irregularly distributed pustules, last chamber smooth. Test low trochospiral, equatorial outline circular and weakly lobate, peripheral margin rounded; chambers globular, increasing slowly in size as added, 12-15 in total, 6-7.5 in the final whorl, last chamber can be kummerform; umbilicus shallow, moderately wide, usually comprising 25-28% of the test diameter; sutures radial and depressed on both sides; primary aperture umbilical-extraumbilical, bordered by a thick, narrow lip. Maximum test diameter averages about 185mmandranges from 150 to 260microns. [copied from Chronos database]

Geological Range:
Last occurrence (top): within H. helvetica zone (92.56-93.52Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within P. ticinensis zone (101.92-103.94Ma, 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

  • 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 planispira, synonyms included - Hedbergella planispira; Praeglobotruncana hansbollii;
  • space-time plot :: Samples map :: Parent: Muricohedbergella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Inflatedcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
    umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
    spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs

    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

    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

    Tappan, H. (1940). Foraminifera from the Grayson formation of Northern Texas. Journal of Paleontology. 14(2): 93-126. gs


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

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110372 Go to Archive.is to create a permanent copy of this page - citation notes



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