Protentella prolixa


Classification: pf_cenozoic -> Globigerinidae -> Protentella -> Protentella prolixa
Sister taxa: P. nicobarensis, P. prolixa, P. sp.,

Taxonomy

Citation: Protentella prolixa Lipps 1964
Rank: species
Basionym: Protentella prolixa Lipps 1964

Catalog entries: Protentella prolixa

Type images:

Distinguishing features: Planispiral with an equatorial symmetrical aperture.

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


Test morphology: Test small, almost planispiral, involute, biumbilicate , equatorial periphery strongly lobulate; axial periphery broadly rounded; chambers initially spherical, later becoming ovate to radially elongate , 5 rapidly enlarging chambers in the final whorl; sutures radial, depressed; surface with regularreticulate pattern of ridges forming circular to subcircular or subhexagonal pore pits (PI. 55, Fig. 1). Aperture basal, nearly equatorial, rather high arch, bordered by a distinct thick lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Stellatechamber arrangement:Planispiraledge view:Equally biconvexaperture:Extraumbilical-peripheral
sp chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Elongateumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Warm subtropical [Kennett & Srinivasan 1983] Warm subtropical (Kennett & Srinivasan 1983)

Phylogenetic relations: P. prolixa resembles Clavatorella bermudezi but differs in its somewhat smaller size, its more planispiral rather than trochospiral adult test, and its somewhat more thickened apertural lip. Surface ultrastructural characteristics suggest close affinities between P. prolixa and Cl. bermudezi (Srinivasan and Kennett, 1975). [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N14 zone (10.46-11.63Ma, top in Tortonian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N12 zone (11.79-13.41Ma, base in Serravallian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.222

References:

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

Lipps, J. H. (1964). Miocene planktonic foraminifera from Newport Bay, California. Tulane Studies in Geology and Paleontology. 2: 109-133. gs

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs

Saito, T., Thompson, P. R. & Breger, D. (1976). Skeletal ultra-microstructure of some elongate-chambered planktonic foraminifera and related species. In, Takayanagi, Y. & Saito, T. (eds) Progress in Micropaleontology, Special Publication. Micropaleontology Press, The American Museum of Natural History, New York 278-304. gs

Srinivasan, M. S. & Kennett, J. P. (1975c). The status of Bolliella, Beella, Protentella and related planktonic foraminifera based on surface ultrastructure. Journal of Foraminiferal Research. 5(3): 155-165. gs


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Protentella prolixa compiled by the pforams@mikrotax project team viewed: 13-11-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104202 Go to Archive.is to create a permanent copy of this page - citation notes



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