Protentella


Classification: pf_cenozoic -> Globigerinidae -> Protentella
Sister taxa: Beella, Globigerina, Globigerinella, Protentella, Quiltyella, Ciperoella, Globigerinoides, Globigerinoidesella, Globoturborotalita, Orbulina, Praeorbulina, Sphaeroidinella, Sphaeroidinellopsis, Trilobatus, Turborotalita, Dentoglobigerina, Globoquadrina, Catapsydrax, Clavatorella, Paragloborotalia, Protentelloides, Eoglobigerina, Globigerinatheka, Globorotaloides, Guembelitrioides, Orbulinoides, Parasubbotina, Pseudoglobigerinella, Subbotina,
Daughter taxa: (blue => in age window 0-300Ma)
Low trochospire; aperture extending from umbilicus to periphery but not onto spiral side, lip.
Planispiral with an equatorial symmetrical aperture.
Specimens which cannot be assigned to established species

Taxonomy

Citation: Protentella Lipps 1964
Rank: genus
Type species: Protentella prolixa Lipps 1964
Taxonomic discussion: Blow (1965) considered Protentella to be a junior synonym of Bolliella Banner and Blow and further suggested that Protentella prolixa, the type species, may be a junior synonym of Bolliella adamsi. Surface ultrastructural studies by Srinivasan and Kennett (1975) of these forms indicate that Protentella prolixa lacks spine bases and the hispid test surface characteristic of Bolliella, but,on the other hand, it has a cancellate pattern of steeply rising ridges (Pl. 55, Fig. 1) as in Clavatorella and Globorotaloides. Similarities in surface ultrastructure among Protentella, Clavatorella, and Globorotaloides suggest that they are phylogenetically closely related. [Kennett & Srinivisan 1983]

Catalog entries: Protentella;

Type images:

Distinguishing features: Like Globigerinella but adult chambers radially elongate. (Late Miocene - Pliocene)

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: Protentella is characterized by an initial trochospiral test, followed by a tendency to become planispiral, and radially elongate adult chambers. The surface ultrastructure is characterized by regular reticulate pattern of ridges forming deep subhexagonal pore pits. [Kennett & Srinivisan 1983]

Biogeography and Palaeobiology


Phylogenetic relations: Protentella evolved from Clavatorella in the Middle Miocene, which in turn descended from Globorotaloides hexagona [Kennett & Srinivisan 1983]

Most likely ancestor: Globigerinella - at confidence level 2 (out of 5). Data source: Aze et al. 2011 [but Kennett & Srinivasan 1989 suggest origin from Clavatorella].

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in upper part of Zanclean Stage (55% up, 4.4Ma, in Zanclean stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Serravallian Stage (19% up, 13.4Ma, in Serravallian stage). Data source: Total of range of species in this database

Plot of occurrence data:

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

References:

Blow, W.H., (1965). Clavatorella, a new genus of the Globorotaliidae. Micropaleontology, 11(3): 365-368.

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

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

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


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Protentella compiled by the pforams@mikrotax project team viewed: 12-11-2018

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104201Go to Archive.is to create a permanent copy of this page - citation notes



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