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Contusotruncana walfischensis


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

Taxonomy

Citation: Contusotruncana walfischensis (Todd, 1970)
Rank: Species
Basionym: Globotruncana walfischensis

Type images:

Original description: Globotruncana walfischensis Todd 1970: "Test high conical with depressed umbilicus; periphery only slightly lobulated, marked by a limbate beaded keel and a secondary keel less strongly developed; chambers distinct, 5 making up the final whorl; early chambers globular, inflated, and tight-coiled, later ones flattened and not inflated; sutures distinct, depressed between the later chambers, curved and oblique on the dorsalside, radiating outward from the umbilicus on the ventral side; wall ornamented by coarse pustules over the initial chambers, later part of test finely spinose between the beaded sutures; aperture unobserved, presumably covered by the umbilical tegilla. Diameter 0.30-0.45 mm; height 0.25-0.32 mm."

Entries in the Catalog of original descriptions: Globotruncana walfischensis;

Geological Range:
Last occurrence (top): within P. hantkeninoides zone (66.04-66.39Ma, 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:Subcircularcoiling axis:Highchamber arrangement:Trochospiralumbilicus:Wide
edge view:Spiroconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:
wall texture:Finely pustuloseaperture:Umbilicalaperture border:Thin porticusaccessory apertures:Intralaminal
periphery:Double keelumb chamber shape:Crescenticsp chbr shape:Crescenticperiph margin shape:Subangular
umb depth:Deepdiameter mm:0.30-0.45 mmwidth mm:breadth mm:
final-whorl chambers:4.0-5.0

References:

Todd, R., (1970). Smaller foraminifera of late Eocene age from Eua, Tonga. U.S. Geological Survey Professional Paper, 640-A: 1-23.


Contusotruncana walfischensis compiled by the pforams@mikrotax project team viewed: 29-5-2017

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