pforams@mikrotax - Pulleniatina praecursor

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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.

K_S 1983 49-6.JPG
Postuma 1971 p383-4.JPG
Postuma 1971 p383-7.JPG

Taxonomy

Citation: Pulleniatina praecursor Banner & Blow, 1967

Taxonomic rank: species

Basionym: Pulleniatina obliquiloculata praecursor Banner & Blow, 1967

Catalog entries: Pulleniatina obliquiloculata praecursor

Type images:

holotype: P. obliquiloculata praecursor
holotype: P. obliquiloculata praecursor

Distinguishing features:
Parent taxon (Pulleniatina): Compact streptospiral test with smooth cortical coating and large slit-like aperture
This taxon: 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

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]

Wall type:

Non-spinose; Smooth [Aze 2011]

Character matrix
test outline: Subcircular chamber arrangement: Trochospiral edge view: Inequally biconvex aperture: Umbilical-extraumbilical
sp chamber shape: Crescentic coiling axis: Low periphery: N/A aperture border: N/A
umb chbr shape: Subtriangular umbilicus: Narrow periph margin shape: Broadly rounded accessory apertures: None
spiral sutures: Flush umb depth: Shallow wall texture: Smooth shell porosity: Macroperforate: >2.5µm
umbilical or test sutures: Flush final-whorl chambers: 5-6 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 comparison with other species of the genus.

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; plot with descendants

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:

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
Taxon plotted: Pulleniatina praecursor, synonyms included - Pulleniatina obliquiloculata praecursor; Pulleniatina praecursor;
See also space-time plot :: Samples map :: Parent: Pulleniatina

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

Pulleniatina praecursor compiled by the pforams@mikrotax project team viewed: 23-1-2025

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Short stable page link: https://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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test outline:	Subcircular	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	Low	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Subtriangular	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Flush	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Flush	final-whorl chambers:	5-6	N.B. These characters are used for advanced search. N/A - not applicable