Citation: Globigerinella pseudobesa (Salvatorini 1967)taxonomic rank: SpeciesBasionym: Turborotalia pseudobesa Salvatorini, 1967Taxonomic discussion: This taxon was not used by Aze et al. (2011) but is included in Kennett & Srinivasan 1983 and widely cited.
Distinguishing features: Parent taxon (Globigerinella): Test initially trochospiral, becoming nearly planispiral; globular to ovate chambers; aperture umbilical; fine spines cover the test This taxon: Test low trochospiral; 4 rapidly enlarging chambers in the final whorl
NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They are being edited as the site is developed and comments on them are especially welcome.
Description
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]
Character matrix
test outline:
Lobate
chamber arrangement:
Pseudoplanispiral
edge view:
Equally biconvex
aperture:
Umbilical-extraumbilical
sp chamber shape:
Globular
coiling axis:
Very low
periphery:
N/A
aperture border:
N/A
umb chbr shape:
Globular
umbilicus:
Wide
periph margin shape:
Broadly rounded
accessory apertures:
None
spiral sutures:
Strongly depressed
umb depth:
Deep
wall texture:
Cancellate
shell porosity:
Macroperforate: >2.5µm
umbilical or test sutures:
Strongly depressed
final-whorl chambers:
4-4
N.B. These characters are used for advanced search. N/A - not applicable
Biogeography and Palaeobiology
Phylogenetic relationsGe. 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]
Most likely ancestor:Globigerinella obesa - at confidence level 3 (out of 5). Data source: 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:
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
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Primary source for this page: Kennett & Srinivasan 1983, p.236
References:
Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs
Salvatorini, G. (1967). Alcune nuove specie di foraminiferi del Miocene superiore della Toscana marittima. Atti della Societa Toscana di Scienze Naturali, Memorie. 73 [1966]: 1-13. gs
Globigerinella pseudobesa compiled by the pforams@mikrotax project teamviewed: 16-9-2024
K_S 1983 59-6.JPG
K_S 1983 59-6.JPG
holotype: T. pseudobesa
paratype: T. pseudobesa
paratype: T. pseudobesa
paratype: T. pseudobesa
paratype: T. pseudobesa
paratype: T. pseudobesa
x: T. pseudobesa
