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Contusotruncana morozovae


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

Taxonomy

Citation: Contusotruncana morozovae (Vasilenko, 1961)
Rank: Species
Basionym: Globotruncana morozovae

Type images:

Original description: Globotruncana morozovae Vasilenko 1961: [Translation from the Russian.]--Test strongly convex, outline stepped in peripheral view, weakly lobate. Dorsally first and second whorls trochoid, last whorl flattened and strongly offset toward the ventral side; chambers of first whorl spherical, very small, lacking septal flanges, smooth; chambers of second whorl semicircular, flattened, separated by arcuate septal sutures with tuberculate, more rarely spinose, narrow flanges; chambers of last whorl 6-7 in number, arcuate, flat, strongly offset opposite to direction of coiling: last chamber often smaller than two preceding ones: septal sutures arcuate with broad tuberculate or more finely spinose flanges, smoothly turning into likewise tuberculate and broad dorsal keels; toward the end of the whorl the sutures and keels become less tuberculate. but do not change in width. On the ventral side the chambers are convex, with flat vertices, and are strongly inclined toward the umbilicus; they lie close together, with nearly no size increase toward the end of the whorl; septal sutures depressed, weakly curved, partially covered by flanges obtained by the fusing of the umbilical flanges and ventral keel of each chamber; round, weakly extended ovals of these thicker parts from a regular rosette on all the chambers of the ventral side. Peripheral margin broad with two keels; ventral keel complete, dorsal one discontinuous; ventrally it is well visible that the dorsal keel overhangs the peripheral margin like a cornice and is parallel to the ventral keel; gap between keels broad, concave; it becomes broader with every chamber as coiling proceeds.

Entries in the Catalog of original descriptions: Globotruncana morozovae;

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian 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:Lobatechamber arrangement:Trochospiraledge view:aperture:
umb chamber shape:coiling axis:Moderateperiphery:Double keelaperture border:
sp chbr shape:umbilicus:periph margin shape:accessory apertures:
umbilical or test sutures:Raised beadedumb depth:wall texture:shell porosity:
spiral sutures:Raised beadeddiameter mm:0.51width mm:0.47breadth mm:0.25
final-whorl chambers:6.0-7.0

References:

Vasilenko, V.P., (1961). Upper Cretaceous foraminifera of the Mangyshlak Peninsula. Vses Neft Nauchno-Issled Geol.-Razved Inst (VNIGRI), Trudy, 171: 160-161.


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Contusotruncana morozovae compiled by the pforams@mikrotax project team viewed: 19-11-2017

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