Pseudohastigerina naguewichiensis

Classification: pf_cenozoic -> Globanomalinidae -> Pseudohastigerina -> Pseudohastigerina naguewichiensis
Sister taxa: P. naguewichiensis, P. micra, P. sharkriverensis, P. wilcoxensis, P. sp.


Citation: Pseudohastigerina naguewichiensis (Myatliuk 1950)
Rank: Species
Basionym: Globigerinella naguewichiensis
Taxonomic discussion:

This species was discussed by Olsson and Hemleben (2006) who followed Toumarkine and Luterbacher (1985) in regarding P. barbadoensis Blow as a junior synonym. The type specimen of P. naguewichiensis is lost; the illustration reproduced on Plate 14.1, Figs. 1-2, shows quite clearly a planispiral evolute form with relatively straight sutures, a lobate outline and only six chambers in the final whorl. The holotype of P. barbadoensis, reproduced on Plate 14.1, Figs. 3-4, is also evolute but is larger, less lobate and has more curved sutures. However, like P. naguewichiensis, P. barbadoensis has more inflated chambers, a more rounded periphery, and a more coarsely perforate test than P. micra. Together these specimens illustrate much of the range of variation shown by this species.This synonymy of barbadoensis with naguewichiensis was also discussed by Pearson and Wade (2015). [Pearson et al. 2018]

Blow (1979) regarded Pseudohastigerina barbadoensis Blow as a subspecies of P. naguewichiensis (Myatliuk) and separated the two morphotypes on the basis of more embracing chambers and more common “pore pits” in P. barbadoensis. The “pore pits” are enlarged openings to pores that are located at the base of a thickened wall in adult specimens. They are probably the result of the individual maintaining access to pores during deposition of this outer layer, which may be due to deposition of gametogenetic calcite or a calcite crust in the terminal stage of the life cycle. Less heavily encrusted individuals do not exhibit as many enlarged openings to the pores and the chambers are smooth with cylindrical pore openings. The degree to which chambers embrace one another would seem to fall within a normal range of variation for a species and it is difficult to separate two morphotypes on this basis alone. For this reason we treat P. barbadoensis as a junior synonym of P. naguewichiensis. [Olsson & Hemleben 2006]

Catalog entries: Globigerinella naguewichiensis, Pseudohastigerina barbadoensis

Type images:

Distinguishing features: Test small, much compressed, circular in umbilical view. Chambers globular, increase very slowly in size, Adult tests appear coarsely perforate.

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.


Wall type: “Smooth, normal perforate; in adult stage wall becomes thickened (gametogenetic calcite?) and openings to pores are enlarged, giving appearance of a coarsely perforate wall” (Olsson and Hemleben, 2006:424). Periphery may be imperforate. [Pearson et al. 2018]

Size: Maximum diameter of holotype 0.20 mm, thickness 0.09 mm. [Pearson et al. 2018]

Character matrix

test outline:Circularchamber arrangement:Planispiraledge view:Equally biconvexaperture:Equatorial
sp chamber shape:Petaloidcoiling axis:N/Aperiphery:N/Aaperture border:Thick lip
umb chbr shape:Petaloidumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: Global in low to high latitudes. [Pearson et al. 2018]

Isotope paleobiology: Poore and Matthews (1984) and Wade and Pearson (2008) recorded relatively negative oxygen isotopes for this species indicating a surface water, mixed-layer habitat as in other Pseudohastigerina. [Pearson et al. 2018]
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on δ13C lighter than species with symbionts; also with relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): Wade & Pearson (2008)

Phylogenetic relations: Pseudo-hastigerina naguewichiensis evolved from P. micra (Olsson and Hemleben, 2006). [Pearson et al. 2018]

Most likely ancestor: Pseudohastigerina micra - at confidence level 3 (out of 5). Data source: Olsson & Hemleben (2006) fig 14.1.

Biostratigraphic distribution

Geological Range:
Notes: Zone E14 (Cotton and others, 2017) to O1 (Bolli, 1957; Leckie and others, 1993; Pearson and Chaisson, 1997; Berggren and Pearson, 2005; see also comments under Genus Pseudohastigerina, above). [Pearson et al. 2018] The LAD of Pseudohastigerina naguewichiensis marks the base of zone O2 / top of O1 (Wade et al. 2011)
Last occurrence (top): at top of O1 zone (100% up, 32.1Ma, in Rupelian stage). Data source: zonal marker (Wade et al. 2011)
First occurrence (base): at base of E15 zone (0% up, 35.9Ma, in Priabonian stage). Data source: Olsson & Hemleben (2006) fig 14.1

Plot of occurrence data:

Primary source for this page: Pearson et al. 2018 - Olig Atlas chap.14 p.406; Olsson & Hemleben 2006 - Eocene Atlas, chap. 14, p. 424


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Pseudohastigerina naguewichiensis compiled by the pforams@mikrotax project team viewed: 22-10-2020

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