Classification: pf_neogene -> Globigerinidae -> Protentella
Sister taxa: Beella, Globigerina, Globigerinella, Protentella, Globigerinoides, Globigerinoidesella, Globoturborotalita, Orbulina, Praeorbulina, Sphaeroidinella, Sphaeroidinellopsis, Trilobatus, Turborotalita, Catapsydrax, Clavatorella, Paragloborotalia, Orcadia,

Distinguishing features: low trochospiral to planispral, adult chambers radially elongate. Wall reticulate with deep pore pits.

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


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: low trochospiral to planispral, adult chambers radially elongate. Wall reticulate with deep pore pits.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.


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): Extant Data source: Total of range of species in this database
First occurrence (base): within Serravallian Stage (11.62-13.82Ma, base 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


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.


Protentella compiled by the pforams@mikrotax project team viewed: 17-3-2018

Taxon Search:
Advanced Search

Go to to create a permanent copy of this page - citation notes

Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
Captcha Image
Powered by Commentics