bforams@mikrotax - Rhizammina indivisa bforams@mikrotax - Rhizammina indivisa

Rhizammina indivisa

NB This site is under active development, current content in the main database is primarily from Bolli et al 1994, Hayward et al. 2012, Holbourn et al. 2013, Holbourn and Kaminski 1997, Alegret & Thomas 2001, and Katz et al. 2003. It is intended to expand and develop this to provide rather comprehensive coverage of Mesozoic and Cenozoic deep-sea benthic foraminifera.


Classification: bf_main -> Astrorhizida -> Rhizammina -> Rhizammina indivisa
Sister taxa: R. indivisa, R. sp.

Taxonomy

Citation: Rhizammina indivisa Brady, 1884
Taxonomic rank: species
Basionym: Rhizammina indivisa Brady, 1884
Synonyms:
Taxonomic discussion: Type species of the genus Testulosiphon Avnimelech, 1952, considered by Loeblich and Tappan (1987) to be a junior synonym of Rhizammina Brady, 1879. [Holbourn et al. 2013]

Catalog entries: Rhizammina indivisa

Type images:

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


Morphology:

Test forms an elongate, unbranched, tube, rarely straight, and often tapered toward the ends, with a circular cross-section. The test wall is thin, flexible, and coarsely agglutinated, often appearing transversely wrinkled. The primary aperture is the terminal opening at the end of the tube. [Holbourn et al. 2013]

Wall composition:
agglutinated

Search data:
TEST: elongate-cylindrical, unilocular, APERTURE: circular, terminal,
Final whorl chambers: 1->1
The morphological data given here can be used on the advanced search page. See also these notes

Biogeography and Palaeobiology


Geographic distribution

Worldwide.

Bathymetry remarks
Bathyal to abyssal. [Holbourn et al. 2013]

Summary of depth range: upper bathyal -> lower abyssal (i.e. 200 -> 10000 m)

Biostratigraphic distribution

Geological Range:
Notes: Early Cretaceous? to Recent. Reports from Cretaceous and Cenozoic deposits are questionable, as fossilized tests do not preserve the orginal flexible wall.
Last occurrence (top): Extant. Data source: Holbourn et al. 2013
First occurrence (base): within Early Cretaceous Epoch (100.50-143.10Ma, base in Berriasian stage). Data source: Holbourn et al. 2013

Plot of occurrence data:
NB The ranges given for genera and higher taxa are the total ranges of species included in that taxon in this database - so the true total range of the taxon will usually be longer

Primary source for this page: Holbourn et al. 2013

References:

Barker, R. W. (1960). Taxonomic notes on the species figured by H.B. Brady in his report on the foraminifera dredged by H.M.S. Challenger during the years 1873–1876. SEPM Special Publication. 9: 1-238. gs

Brady, H. B. (1884). Report on the foraminifera dredged by H.M.S. Challenger during the years 1873–1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-1876. 9: 1-814. gs

Holbourn, A., Henderson, A. S. & MacLeod, N. (2013). Atlas of Benthic Foraminifera. Natural History Museum, London. 1-651. gs

Jones, R. W. (1994). The Challenger Foraminifera. Oxford University Press, Oxford. 1-149. gs

Loeblich, A. R. Jr & Tappan, H. (1987). Foraminiferal Genera and their Classification. Van Nostrand Reinhold, New York. 1-970. gs

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Rhizammina indivisa compiled by the bforams@mikrotax project team viewed: 18-6-2026

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bforams@mikrotax has been supported by US IODP Science Support Program and by the Geologic TimeScale Foundation
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