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Contusotruncana plummerae


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

Taxonomy

Citation: Contusotruncana plummerae (Gandolfi, 1955)
Rank: Species
Basionym: Globotruncana fornicata plummerae
Synonyms: Globotruncana fornicata ackermanni; Globotruncana adamsi; Globotruncana fornicata cesarensis; Globotruncana fornicata globulocamerata; Globotruncana wilsoni; Globotruncana lunaris

Type images:

Original description: Globotruncana fornicata plummerae Gandolfi 1955: "Flat or slightly convex on the dorsal side, two keels equally developed, somewhat diverging, peripheral band only slightly oblique to the plane of coiling; four to five chambers in the last whorl, long and arched as in the previous subspecies [Globotruncana fornicata subsp. Manaurensis Gandolfi, 1955] but longitudinally inflated with well-developed median inner marginal depression in the last chambers. On the ventral side, the chambers are usually flat with long, curved raised sutures, but the early ones are occasionally inflated and short, with the marginal elevations disappearing in the radial sutural depressions. The test is dextrally coiled.

Entries in the Catalog of original descriptions: Globotruncana adamsi;
Globotruncana fornicata ackermanni;
Globotruncana fornicata cesarensis;
Globotruncana fornicata globulocamerata;
Globotruncana fornicata plummerae;
Globotruncana lunaris;
Globotruncana wilsoni;

Geological Range:
Last occurrence (top): within R. fructicosa zone (69.18-70.14Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of C. plummerae zone (0% up, 79.2Ma, in Campanian stage). Data source: zonal marker (from Timescale Creator)

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:Circularcoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Wide
edge view:Planoconvexumbilical or test sutures:Moderately depressedspiral sutures:Raised beadedshell porosity:Finely Perforate: 1-2.5
wall texture:Finely pustuloseaperture:Umbilicalaperture border:N/Aaccessory apertures:None
periphery:Double keelumb chamber shape:Crescenticsp chbr shape:Crescenticperiph margin shape:Moderately rounded
umb depth:Deepdiameter mm:0.38width mm:0.28breadth mm:0.22
final-whorl chambers:4.0-5.0

References:

Gandolfi, R., (1955). The genus Globotruncana in northeastern Colombia. Bull. Am. Paleontol., 36: 1-118.


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Contusotruncana plummerae compiled by the pforams@mikrotax project team viewed: 22-7-2017

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