Marginotruncana

Daughter taxa (time control age-window is: 0-800Ma)
			Marginotruncana angusticarenata
			Marginotruncana caronae
			Marginotruncana coronata
			Marginotruncana desioi
			Marginotruncana manaurensis
			Marginotruncana marginata
			Marginotruncana paraconcavata
			Marginotruncana pileoliformis
			Marginotruncana pseudolinneiana
			Marginotruncana renzi
			Marginotruncana schneegansi
			Marginotruncana sigali
			Marginotruncana sigmoconcavata
			Marginotruncana sinuosa
			Marginotruncana tarfayaensis
			Marginotruncana undulata
			Marginotruncana sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: Globotruncaninae, welche vom Anfang an das Protoforamen verloren haben oder nie ausbildeten Auch ist nicht unmoglich, dass das Protoforamen mit dem Deuteroforamen verschmolzen ist. Daher ist die ventrale Kammerwand nicht schief ausgebildet, sondern stutzt sich gegen den Nabel mitder Umbilicallipe (Tenon) ab; die Grenze des perforierten Wandteiles mit der porenlosed Lippe ist parallel zum Nabel. Die Suturen der Kammern sind radial auf der Ventralseite.Familie Marginolamelidae. Unter familie Globotruncaninae. Cenoman-Maastricht:

Entries in the Catalog of original descriptions: Marginotruncana, Sigalitruncana

Distinguishing features:
Parent taxon (Globotruncanidae): Test trochospiral, chambers angular, periphery truncate or carinate; primary aperture umbilical, covered by a spiral system of tegilla that is provided with accessory intralaminal and infralaminal apertures.
This taxon: Test trochospiral, biconvex to planoconvex, sutures sigmoidal, especially on the umbilical side, curved, elevated and may be beaded on the spiral side, imperforate carinal band between the two peripheral keels, peripheral outline entire to lobulate; wall calcareous, perforate, surface smooth to pustulose; primary aperture interiomarginal and extraumbilical-umbilical, bordered by a triangular porticus, those of successive apertures fusing and may even form true tegilla, infralaminal and occasionally intralaminal accessory apertures present.

Geological Range:
Last occurrence (top): at top of G. elevata zone (100% up, 79.3Ma, in Campanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Turonian Stage (89.39-93.90Ma, base in Turonian stage). Data source: Total of ranges of species in this 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Globotruncanidae

Marginotruncana compiled by the pforams@mikrotax project team viewed: 19-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110328 Go to Archive.is to create a permanent copy of this page - citation notes

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