K_S 1983 49-6.JPG
Postuma 1971 p383-4.JPG
Postuma 1971 p383-7.JPG
K_S 1983 49-6.JPG
Postuma 1971 p383-4.JPG
Postuma 1971 p383-7.JPGCatalog entries: Pulleniatina obliquiloculata praecursor
Type images:
holotype: P. obliquiloculata praecursor_P46423_Holo.JPG)
holotype: P. obliquiloculata praecursorDistinguishing 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.
Wall type: Non-spinose; Smooth [Aze 2011]
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: | 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: | 5.0-6.0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
[SCOR WG138]
Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]
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;
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
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. gsReferences:
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Pulleniatina praecursor compiled by the pforams@mikrotax project team viewed: 28-1-2021
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 |