Tenuitella

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Candeinidae -> Tenuitella
Sister taxa: Candeina, Globigerinatella, Globigerinita, Mutabella, Tenuitella,

Distinguishing features: Minute to small, low trochospiral test, globular chambers, smooth surface penetrated by extremely small perforations, which are usually obscured by small pustules or crystallites

Daughter taxaTaxa organised stratigraphically, by first occurence (blue => in age window 0-300Ma)
Four chambers
Five or more chambers, curved sutures
Five radially elongate chamers
Like T. munda but larger, 5 chambers in final whorl, and a more flattened lip
Very small, low trochospiral, lobate, 4-4½ chambers in final whorl, sutures depressed. Surface fairly smooth with fine pustules; umbilicus narrow; aperture low arch with thin lip
Specimens which cannot be assigned to established species

Taxonomy

Citation: Tenuitella Fleisher 1974
Rank: genus
Type species: Globorotalia munda Jenkins 1966
Taxonomic discussion: Fleisher (1974) proposed the genus Tenuitella for a group of small Cenozoic planktonic foraminifera that are usually grouped within Globorotalia or Turborotalia. Our concept of Tenuitella is essentially the same as that of Fleisher (1974) except that we treat Tenuitella as a subgenus of Globorotalia (Srinivasan and Kennett, 1981a). The diagnostic features common to all species of Tenuitella are that all have a minute to small, low trochospiral test, globular chambers lacking a distinct carina, and a smooth surface penetrated by extremely small perforations, which are usually obscured by small pustules or crystallites (PI. 39, Figs. 1-4). The subgenus Tenuitella can be easily distinguished from other globorotaliids by its characteristic smooth surface and smaller size. [Kennett & Srinivasan 1983]

Catalog entries: Tenuitella;

Type images:

Distinguishing features: Minute to small, low trochospiral test, globular chambers, smooth surface penetrated by extremely small perforations, which are usually obscured by small pustules or crystallites

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.

Description

Biogeography and Palaeobiology


Phylogenetic relations: Important Neogene species referable to Tenuitella are Gr. clemenciae and Gr. anfracta, which show morphological continuity as a lineage from the Late Oligocene through the Neogene (Text Fig. 18). Gr. (Te.) munda exhibits most of its stratigraphic range within the Paleogene. Gr. (Te.) gemma Jenkins (Late Eocene to Eatly Oligocene) seems to be the earliest member of the Tenuitella lineage. Because of its smaller size, Tenuitella has largely been overlooked in planktonic foraminiferal studies. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Rupelian Stage (0% up, 33.9Ma, in Rupelian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.161

References:

Fleisher, R.L., (1974). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project, 23: 1001-1072.

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

Srinivasan, M.S. & Kennett, J.P., (1981). A review of Neogene planktonic foraminiferal biostratigraphy: applications in the equatorial and south Pacific. SEPM Special Publication: 395-432.


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Tenuitella compiled by the pforams@mikrotax project team viewed: 25-6-2018

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