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Contusotruncana contusa


Classification: pf_mesozoic -> Globotruncanidae -> Contusotruncana -> Contusotruncana contusa
Sister taxa: C. contusa, C. fornicata, C. morozovae, C. patelliformis, C. plicata, C. plummerae, C. walfischensis, C. sp.,

Taxonomy

Citation: Contusotruncana contusa (Cushman, 1926)
Rank: Species
Basionym: Pulvinulina arca var. contusa
Synonyms: Globotruncana contusa galeoidis; Globotruncana linnei var. caliciformis

Type images:

Original description: "Test large, robust, spiroconvex with a sharply angular, polygonal outline and a peculiarly shaped, folded surface; dorsal side highly trochopsirally coiled, with bluntly curved convex folds radiating from the apex and shallowly concave, broader depressions running between the radiating folds, and widening away towards the base; ventral side concave; equatorial periphery roughly pentagonal with blunt corners, gently undulating and very weakly, if at all, lobate; periphery with two well-developed, heavily beaded keels, enclosing a relatively wide, almost horizontal, slightly depressed peripheral band; axial periphery subangular, distinctly truncate; chambers, on the dorsal side 23, arranged in 4 dextrally coiled whorls; they increase moderately and regularly in size till shortly before the beginning of the last whorl where they start to enlarge very rapidly and to change in shape; the initial chambers are small, inflated globigerine; they increasemoderately in size and are followed by relatively large, globular, inflated cahambers which increase more rapidly in size, and towards the end of the penultimate whorl; the last whorl is composed of 4, very long, very narrow, broadly curved, roughly oblong, undulating chambers which are extremely elongated in the direction of coiling; on the ventral side the chambers are 4, very large, angular, roughly oblong, very narrow, strongly elongated in the direction of coiling with their surfaces gently sloping towards the umbilicus; sutures on the dorsal side slightly curved, faintly raised and delicately beaded in the early part, strongly curved, raised, thichened and heavily beaded later; on the ventral side the sutures are straight, radial and depressed; umbilicus rhomboidal in outline, relatively wide, deep, surrouncded by beaded umbilical ridges and covered by complex tegilla of which remnants are still preserved; primary apertures interiomarginal, umbilical; tegilla, with accessory apertures, only poorly preserved; wall calcareous, perforate except for the imperforate keels, peripheral band and tegilla; surface delicately papillose especially on the early part and on the ventral side."

Entries in the Catalog of original descriptions: Pulvinulina arca contusa, Globotruncana contusa galeoidis, Globotruncana linnei caliciformis

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.30-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. fructicosa zone (69.18-70.14Ma, base in Maastrichtian 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: Contusotruncana contusa, synonyms included - Contusotruncana contusa; Contusotruncana galeoidis; Globotruncana caliciformis; Globotruncana contusa; Globotruncana contusa galeoidis; Globotruncana linnei calciformis; Marginotruncana contusa; Rosita contusa;
  • space-time plot :: Samples map :: Parent: Contusotruncana

    Character matrix

    test outline:Subpolygonalchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
    sp chamber shape:Crescenticcoiling axis:Highperiphery:Double keelaperture border:Thick porticus
    umb chbr shape:Crescenticumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Intralaminal
    spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Almogi-Labin, A., Reiss, Z & Caron, M. (1986). Senonian globotruncanidae from Israel. Eclogae Geologicae Helvetiae. 79(3): 849-895. gs

    Cushman, J. A. (1926c). Some foraminifera from the Mendez shale of Eastern Mexico. Contributions from the Cushman Foundation for Foraminiferal Research. 2(1): +20+-. gs

    Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

    Robaszynski, F., Caron, M., Gonzales Donoso, J. M., Wonders, A. A. H. & the European Working Group on Planktonic Foraminifera (1984). Atlas of Late Cretaceous globotruncanids. Revue de Micropaléontologie. 26(03-Apr): 145-305. gs

    Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs


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    Contusotruncana contusa compiled by the pforams@mikrotax project team viewed: 13-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110068 Go to Archive.is to create a permanent copy of this page - citation notes



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