Globigerinatella


Classification: pf_cenozoic -> Globigerinitidae -> Globigerinatella
Sister taxa: Dipsidripella, Globigerinatella, Globigerinita, Mutabella, Tenuitella,
Daughter taxa: (blue => in age window 0-300Ma)


Taxonomy

Citation: Globigerinatella Cushman & Stainforth 1945
Rank: genus
Type species: Globigerinatella insueta Cushman & Stainforth 1945
Taxonomic discussion: The distinguishing feature of Globigerinatella is its small, subglobular test with the final chamber embracing the early trochospiral portion and distinct areal and supplementary apertures. The surface is microperforate, with extremely small, irregularly distributed pores , without pore pits, and is covered largely by small, subconical tubercles or crystallites as in Globigerinita (Pl. 56, Fig. 2).
The strongly embracing final chamber and areal and sutural supplementary apertures provides a superficial resemblance with Orbulina. However, it distinctly differs from Orbulina in surface ultrastructure in the character of the areal apertures, which are surrounded by lips, and in its relatively smaller test size. [Kennett & Srinivasan 1983]

Catalog entries: Globigerinatella;

Type images:

Distinguishing features: globular test, final chamber embraces the earlier spiral part; numerous areal and supplementary apertures

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

Biogeography and Palaeobiology


Phylogenetic relations: The test size and microperforate ultrastructure of Globigerinatella indicates strong affinities with Globigerinita and Candeina. Blow (1969) suggested that Globigerinatella evolved from Globigerinita ambitacrena (= synonym of Ga. glutinata). Globigerinatella is a short-ranging, geographically restricted monospecific genus (Text Fig. 25). [Kennett & Srinivasan 1983]

Most likely ancestor: Globigerinita - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 25.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in upper part of Langhian Stage (59% up, 14.7Ma, in Langhian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Burdigalian Stage (64% up, 17.6Ma, in Burdigalian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.228

References:

Blow, W.H., (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In: Bronnimann, P. and Renz, H.H. (Editors), Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967, Leiden, Netherlands, pp. 380-381.

Cushman, J.A. & Stainforth, R.M., (1945). The foraminifera of the Cipero Marl Formation of Trinidad, British West Indies. Cushman Laboratory for Foraminiferal Research Special Publication, 14: 1-75.

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


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Globigerinatella compiled by the pforams@mikrotax project team viewed: 15-12-2018

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104039Go to Archive.is to create a permanent copy of this page - citation notes



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