Pulleniatina spectabilis


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

Taxonomy

Citation: Pulleniatina spectabilis Parker 1965
Rank: species
Basionym: Pulleniatina spectabilis

Catalog entries: Pulleniatina spectabilis

Type images:

Distinguishing features: Like P. praespectabilis but pseudocarina (pinched shoulder) on final whorl, and dorsal surface flatter

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: Planoconvex, low to medium trochospiral, later becoming streptospiral, with pseudocarinate periphery

Aperture: Extraumbilical medium to low arch without lip or rim [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test morphology: Test planoconvex except for the slightly protruding initial coil; low to medium trochospiral, later becoming streptospiral; equatorial periphery lobulate, axial periphery subacute to angled, producing pseudocarinate periphery; chambers 5 to 6 in the final whorl; sutures flush on umbilical side, on spiral side slightly curved, nearly flush; surface smooth, polished, granular on early chambers directly facing the aperture; aperture a medium to low arch, extraumbilical, without a lip or rim. [Kennett & Srinivasan 1983]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture border:N/A
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Narrowly 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, confined to Pacific. [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. spectabilis is distinguished from other species of Pulleniatina by its almost planoconvex test and broad pseudocarina. This short-ranging and geographically restricted species evolved from Pu. primalis in the latest Miocene by developing pseudocarinate periphery and planoconvex test. [Kennett & Srinivasan 1983]

Most likely ancestor: Pulleniatina praespectabilis - at confidence level 2 (out of 5). Data source: Aze et al., 2011, Bronnimann & Resig 1971 (NB Kennett & Srinivasan 1983 did not differentiate praespecatbilis).

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in lower part of PL2 zone (31% up, 4.2Ma, in Zanclean stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).
First occurrence (base): within N18 zone (5.20-5.72Ma, base in Messinian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.202

References:

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

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

Parker, F. L. (1965a). A new planktonic species (foraminiferida) from the Pliocene of Pacific deep-sea cores. Contributions from the Cushman Foundation for Foraminiferal Research. 16(4): 151-152. gs

Wade, B. S., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. gs


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Pulleniatina spectabilis compiled by the pforams@mikrotax project team viewed: 27-2-2020

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