Citation: Parasubbotina pseudowilsoni Olsson & Pearson, in Olsson et al. 2006Taxonomic rank: speciesBasionym: Parasubbotina pseudowilsoniSynonyms:
Turborotaliawilsoni Cole.—Toumarkine and Luterbacher, 1985:125, fig. 27:2-3 [middle Eocene Zone E10/11, Guayabal Fm., type locality, Tampico, Mexico]. [Not Cole, 1927.]
Taxonomic discussion: Toumarkine and Luterbacher (1985) reillustrated the line drawing of the holotype of Globigerinawilsoni along with three SEM images they identified to that species from the type Guayabal Formation, from where G. wilsoni was originally described. New SEM images of the holotype of G. wilsoni (Chapter 6, Pl. 6.23, Figs. 15-17), although poorly preserved, show that it differs from the hypotypes illustrated by Toumarkine and Luterbacher in that the ultimate chamber is more flattened and extends towards and over the umbilicus. In this respect, the holotype appears much more like Globorotaloidescarcoselleensis Toumarkine and Bolli ( =Turborotalitacarcoselleensis), which is common in the Guayabal Formation. However, the poor state of preservation does not allow an accurate identification, and we place wilsoni in questionable synonymy with carcoselleensis. Parasubbotinapseudowilsoni n. sp. is also a common form in the Guayabal Formation and occurs as a relatively inconspicuous component in many other Eocene localities. [Olsson et al. 2006]
Distinguishing features: Parent taxon (Parasubbotina): Very low trochospiral test, chambers increasing rapidly in size; aperture high-arched umbilical-extraumbilical aperture. At most 5 chambers in final whorl. This taxon: Test small, compact, very low trochospiral, typically<5 chambers in 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
Diagnostic characters: Parasubbotinapseudowilsoni n. sp. is a small form with a compact, very low trochospiral test that typically has 5 chambers in the final whorl, as seen in dorsal view. Parasubbotinavarianta is larger and has a more lobulate test with 4 chambers in the ultimate whorl. [Olsson et al. 2006]
Character matrix
test outline:
Lobate
chamber arrangement:
Trochospiral
edge view:
Equally biconvex
aperture:
Umbilical-extraumbilical
sp chamber shape:
Globular
coiling axis:
Low
periphery:
N/A
aperture border:
Thin flange
umb chbr shape:
Globular
umbilicus:
Narrow
periph margin shape:
Broadly rounded
accessory apertures:
None
spiral sutures:
Weakly depressed
umb depth:
Shallow
wall texture:
Cancellate
shell porosity:
Finely Perforate: 1-2.5µm
umbilical or test sutures:
Moderately depressed
final-whorl chambers:
4.5-5
N.B. These characters are used for advanced search. N/A - not applicable
Biogeography and Palaeobiology
Geographic distributionCosmopolitan in low to mid latitudes. [Olsson et al. 2006]
Aze et al. 2011 summary: Low to middle latitudes; based on Olsson et al. (2006c) Isotope paleobiologyNo data available. [Olsson et al. 2006] Aze et al. 2011 ecogroup 3 - Open ocean thermocline; based on comparison with other species of the genus. Phylogenetic relationsParasubbotinapseudowilsoni n. sp. appears to have developed from P. varianta (Subbotina) in the uppermost Lower Eocene [Olsson et al. 2006]
Most likely ancestor: Parasubbotina varianta - at confidence level 4 (out of 5). Data source: Olsson et al. 2006 f5.1.
Biostratigraphic distribution
Geological Range: Notes: Upper Zone E7 to Zone E11. [Olsson et al. 2006] Last occurrence (top): within E11 zone (40.40-41.89Ma, top in Bartonian stage). Data source: Olsson et al. 2006 First occurrence (base): within E7 zone (45.72-50.20Ma, base in Ypresian stage). Data source: Olsson et al. 2006
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.
Grey shading between taxa indicates intergrading species within an anagenetic lineage (data from
Lamyman et al. 2026).
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Parasubbotina
Primary source for this page: Olsson et al. 2006 - Eocene Atlas, chap. 5, p. 103
References:
Cole, W. S. (1927). A foraminiferal fauna from the Guayabal formation in Mexico. Bulletins of American Paleontology. 14(51): 1-36. gs
Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 5): 67-110. gsO
Toumarkine, M. & Luterbacher, H. (1985). Paleocene and Eocene planktic foraminifera. In, Bolli, H. M., Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge Univ. Press, Cambridge 87-154. gs
Parasubbotina pseudowilsoni compiled by the pforams@mikrotax project teamviewed: 13-10-2026
Eocene_Atlas_pl05-12_fig4.jpg
Eocene_Atlas_pl05-12_fig5-7.jpg
Eocene_Atlas_pl05-12_fig4.jpg
Eocene_Atlas_pl05-12_fig5-7.jpg
holotype: P. pseudowilsoni
paratype: P. pseudowilsoni
paratype: P. pseudowilsoni
