Pulleniatina praecursor


Classification: pf_cenozoic -> Globorotaliidae -> Pulleniatina -> Pulleniatina praecursor
Sister taxa: P. finalis, P. obliquiloculata, P. praecursor, P. primalis, P. spectabilis, P. praespectabilis, P. sp.,

Taxonomy

Citation: Pulleniatina praecursor Banner & Blow, 1967
Rank: species
Basionym: Pulleniatina obliquiloculata praecursor Banner & Blow, 1967

Catalog entries: Pulleniatina obliquiloculata praecursor

Type images:

Distinguishing features: Like P. primalis but aperture extends onto the periphery of the previous 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: Trochospiral intially becoming streptospiral, broadly rounded chambers, spherical test covered in thick cortex

Aperture: Interiomarginal umbilical-extraumbilicala medium arch at the base of the final chamber [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Non-spinose; Smooth [Aze 2011]

Test morphology: Test medium,initially trochospiral, later streptospiral, equatorial periphery slightly lobulate, axial periphery broadly rounded, chambers subspherical, about 5 to 6 in the final whorl,increasing slowly in size except for the last chamber, which is abruptly more embracing; sutures weak, on spiral side curved, gently depressed; on umbilical side radial, depressed ; surface smooth, covered with thick cortex, granular on early chambers facing the aperture; umbilicus covered by last chamber; aperture interiomarginal, extraumbilical-umbilical, a rather medium arch along the base of the final chamber extending up to the periphery of the preceding whorl. [Kennett & Srinivasan 1983]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:N/A
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Flushumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Flushfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light ∂13C and relatively heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): this study

Phylogenetic relations: Pu. praecursor represents an intermediate evolutionary stage between Pu. primalis and Pu. obliquiloculata. It is distinguished from Pu. primalis by its aperture, which extends farther onto the periphery than Pu. primalis. [Kennett & Srinivasan 1983]

Most likely ancestor: Pulleniatina primalis - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 22; Aze et al. 2011.
Likely descendants: Pulleniatina obliquiloculata;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N21 zone (1.93-3.10Ma, top in Gelasian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N19 zone (4.37-5.20Ma, base in Zanclean stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.200

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Banner, F. T. & Blow, W. H. (1967). The origin, evolution and taxonomy of the foraminiferal genus Pulleniatina Cushman, 1927. Micropaleontology. 13(2): 133-162. gs

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

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs


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Pulleniatina praecursor compiled by the pforams@mikrotax project team viewed: 11-12-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104207 Go to Archive.is to create a permanent copy of this page - citation notes



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