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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: Pulvinulina arca contusa Cushman 1926: "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: Globotruncana contusa galeoidis;
Globotruncana linnei caliciformis;
Pulvinulina arca contusa;

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:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Subpolygonalchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
umb chamber shape:Crescenticcoiling axis:Highperiphery:Double keelaperture border:Thick porticus
sp chbr shape:Crescenticumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Intralaminal
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5
spiral sutures:Raised beadeddiameter mm:0.50 mm - 0.70 mmwidth mm:0.45 mmbreadth mm:
final-whorl chambers:4.5-5.5

References:

Cushman, J.A., (1926). Foraminifera of the genera Siphogenerina and Pavonina. Proceedings of the United States National Museum, 67(2597): 1-24.

Cushman, J.A., (1926). The foraminifera of the Velasco shale of the Tampico embayment. Bulletin of the American Association of Petroleum Geologists, 10(6): 581-612.

Cushman, J.A., (1926). Recent foraminifera from Porto Rico. Papers from the Department of Marine Biology of the Carnegie Institution of Washington, 23: 73-84.


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Contusotruncana contusa compiled by the pforams@mikrotax project team viewed: 18-8-2017

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