Contusotruncana morozovae

Taxonomy

Original description: [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 (66.04-72.17Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within Campanian Stage (72.17-83.65Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Contusotruncana

Contusotruncana morozovae compiled by the pforams@mikrotax project team viewed: 25-4-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110071 Go to Archive.is to create a permanent copy of this page - citation notes

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