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Mesozoic Planktonic Foraminifera


Classification: pf_mesozoic
Sister taxa: > >>
Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
triserial
Early stage trochospiral, triserial, or biserial, later may show serial reduction or proliferation.

biserial-multiserial
Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.

planispiral
Test planispiral, biumbilicate, periphery carinate, sutures strongly arched; aperture a low equatorial opening.

Test planispiral, chambers globular to radially elongate; aperture at the base of the chamber face and equatorial in position, lateral portions of primary aperture may remain open as new chambers are added, forming relict openings around the umbilical region.

Test trochospiral to nearly planispiral, chambers with one or more hollow tubulospines; aperture equatorial and may have broad lip.

trochospiral (in sequence of increasing complexity)




Test trochospirally coiled, chambers inflated, rounded to ovate; wall cancellate, with abundantly perforated fields bordered by imperforate ridges; primary aperture umbilical to slightly extraumbilical, with an imperforate lip; umbilicus narrow to wide and deep, margin noncarinate.

Globigerinacea with trochspiral tests, in which the primary aperture is intraumblical or intraumbilical-extraumbilical and which possess a microperforate wall lacking muricae, crystallite pustules, or spine bases; differs from the Favusellacea in its lack of muricae (and in possessing a calcitic test) and from the Schackoinidae in not becoming planispiral.

Test trochospirally coiled, primary aperture interiomarginal, extraumbilical-umbilical, with prominent apertural lip, apertures of earlier chambers remain visible around the umbilical region; no sutural secondary apertures.

Test trochospiral, chambers inflated, periphery rounded, not carinate; wall with pustules, costellae, or other rugosities; aperture umbilical, with portici or tegilla.

Test trochospirally enrolled, primary aperture umbilical-extraumbilical in position and with bordering lip, secondary sutural apertures on umbilical side open into posterior edge of chambers.

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.

Taxonomy

Citation: Mesozoic Planktonic Foraminifera

Type images:

Original description: :

Entries in the Catalog of original descriptions:

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in stage). Data source: Total of range of species in this 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.

References:


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Mesozoic Planktonic Foraminifera compiled by the pforams@mikrotax project team viewed: 26-9-2017

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