Globigerinella pseudobesa

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Globigerinella -> Globigerinella pseudobesa
Sister taxa: G. adamsi, G. calida, G. praesiphonifera, G. pseudobesa, G. radians, G. siphonifera, G. sp.,

Taxonomy

Citation: Globigerinella pseudobesa Salvatorini 1966
Rank: Species
Basionym: Turborotalia pseudobesa Salvatorini, 1966
Taxonomic discussion: This taxon was not used by Aze et al. (2011) but is included in Kennett & Srinivasan 1983 and widely cited.

Catalog entries:

Type images:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Test morphology: Test low trochospiral , equatorial periphery strongly lobulate , axial periphery broadly rounded; chambers spherical to subspherical; 4 rapidly enlarging chambers in the final whorl; spiral sutures radial, depressed; umbilical sutures slightly curved to nearly radial; surface densely perforated with circular to subcircular pores and elevated circular spine bases. Umbilicus wide and deep; aperture interiomarginal , umbilical-extraumbilical, a rather medium-wide arch extending to the spiral side of the test, without a lip or rim. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Subtropical [Kennett & Srinivasan 1983]

Phylogenetic relations: Ge. pseudobesa shows a wide range of variation in apertural position from extraumbilical to nearly umbilical as in Globigerina. The aperture commonly extends onto the spiral side of the test. Ge. pseudobesa closely resembles Ge. obesa but differs in the highly variable apertural position. The surface ultrastructure and general test morphology suggests that Ge. pseudobesa and Ge. obesa are closely related. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N19 zone (4.37-5.20Ma, top in Zanclean stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N13 zone (11.63-11.79Ma, base in Serravallian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.236

References:

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Salvatorini, G., (1966). Alcune nuove specie di foraminiferi del Miocene Superiore della Toscana Marittima. Atti Soc. Tosc. Sci. Nat., 73: 1-13.


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Globigerinella pseudobesa compiled by the pforams@mikrotax project team viewed: 16-12-2017

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