Globotruncanita

Daughter taxa (time control age-window is: 0-800Ma)
			Globotruncanita angulata
			Globotruncanita atlantica
			Globotruncanita conica
			Globotruncanita elevata
			Globotruncanita insignis
			Globotruncanita pettersi
			Globotruncanita stuarti
			Globotruncanita stuartiformis
			Globotruncanita sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: Test highly trochospiral; chamber form variable, mostly polygonal in outline; single-keeled throughout; keel present on all chambers (except the earliest ones), distally dichotomic with dorsoseptal and ventro-septal as well as periumbilical extensions; spine-shaped extensions of the chambers present in some forms; cameral aperture umbilical, single; labial aperture pointing strongly backwards, in reflexed position opening into the umbilical cavity or suprasuturally towards the periphery; lips much longer on the distal side than on the proximal one, extremely highly arched, much narrower at the junction with the corresponding chamber and trumpet-shaped, overriding each other or fusing the strongly recurving distal ends and forming an umbilical cover-plate covering entirely the umbilical cavity with labial apertures opening towards the periphery; umbilicus large, partly or entirely covered by the apertural lips.

Entries in the Catalog of original descriptions: Globotruncanita

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, chambers rhomboidal in section, sutures elevated, oblique or radial, straight or curved on the spiral side, depressed or elevated on the umbilical side, periphery with a beaded single keel that is continuous with the sutures on the spiral side, peripheral outline subcircular, polygonal, or lobate; wall calcareous, finely perforate, smooth except for the beaded sutures and peripheral keel and a concentric row of pustules near the umbilicus on the umbilical side; primary aperture interiomarginal, umbilical to slightly extraumbilical, successive apertures covered by portici that may remain free or may coalesce in the umbilicus to leave proximal accessory apertures.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian 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

Globotruncanita compiled by the pforams@mikrotax project team viewed: 13-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110189 Go to Archive.is to create a permanent copy of this page - citation notes

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