bforams@mikrotax - Annectina biedai

bforams@mikrotax - Annectina biedai bforams@mikrotax - Annectina biedai

Annectina biedai

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 -> Spirillinida -> Annectina -> Annectina biedai
Sister taxa: A. biedai, A. grzybowskii, A. sp.

Holbourn et al 2013 f035.jpg

Taxonomy

Citation: Annectina biedai Gradstein & Kaminski, 1997

Taxonomic rank: species

Basionym: Annectina biedai Gradstein & Kaminski, 1997

Synonyms:

Ammodiscus sp. B, –King, 1989, pl. 9.1, fig. 5. [according to Holbourn et al. 2013]
Glomospira biedai (Samuel). –Charnock and Jones, 1990, p. 156, pl. 14, fig. 8; pl. 2, fig. 10. [according to Holbourn et al. 2013]
Annectina biedai Gradstein and Kaminski. –Kaminski and Gradstein, 2005, pp. 195–198, fig. 29, pl. 29. [according to Holbourn et al. 2013]

Taxonomic discussion: Annectina biedai Gradstein and Kaminski differs from Annectina grzybowskii (Jurkiewicz) by its thinner, more compressed test, larger number of whorls in the planispiral part, and smaller initial triloculine portion. Annectina grzybowskii probably became extinct in the Early Eocene, whereas Annectina biedai mainly occurs in younger strata, becoming extinct in the Oligocene (Gradstein and Kaminski, 1997). [Holbourn et al. 2013]

Catalog entries: Annectina biedai

Type images:

holotype: A. biedai
holotype: A. biedai
paratype: A. biedai

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 slightly elliptical to circular in outline, composed of a proloculus followed by an undivided, tubular, second chamber. The tubular chamber remains thin, initially forming a milioline coil, then becoming planispiral with numerous whorls (ten or more). The planispiral portion is almost flat with a flush, coiled suture, which may exhibit small, wavy irregularities (Kaminski and Gradstein, 2005). The test wall is solid, very finely agglutinated, and silicified. The primary aperture is a round, terminal opening at the end of the planispiral tube. [Holbourn et al. 2013]

Wall composition:

agglutinated

Search data:

TEST: discoidal, unilocular, mixed, planispiral, 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

North Sea and Norwegian Sea (Kaminski and Gradstein, 2005).

Bathymetry remarks

Bathyal (Kaminski and Gradstein, 2005). [Holbourn et al. 2013]

Summary of depth range: upper bathyal -> lower bathyal (i.e. 200 -> 2000 m)

Biostratigraphic distribution

Geological Range:
Notes: ?Middle Eocene to Late Oligocene. Common in the Early Oligocene (Biozone NSR7A of Gradstein and Bäckström, 1996). Total stratigraphic range may extend down to the Late Paleocene (Kaminski and Gradstein, 2005).
Last occurrence (top): within Late Oligocene Sub-Epoch (23.03-28.09Ma, top in Chattian stage). Data source: Holbourn et al. 2013
First occurrence (base): within Middle Eocene Sub-Epoch (37.75-47.84Ma, base in Lutetian 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

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested. Parent: Annectina

Primary source for this page: Holbourn et al. 2013

References:

Charnock, M. A. & Jones, R. W. (1990). Agglutinated foraminifera from the Palaeogene of the North Sea. In, Hemleben, C., Kaminski, M. A., Kuhnt, W. , & Scott, D. B. (eds) Paleoecology, Biostratigraphy, Paleoceanography and Taxonomy of Agglutinated Foraminifera,. Nato ASI (Advanced Study Institute) Series . 139-244. gs

Gradstein, F. M. & Bäckström, S. A. (1996). Cenozoic biostratigraphy and paleobathymetry, northern North Sea and Haltenbanken. Norsk Geologisk Tidsskrift. 76: 3-32. gs

Gradstein, F. M. & Kaminski, M. A. (1997). New species of Paleogene deep-water agglutinated foraminifera from the North Sea and Norwegian Sea. Annales Societatis Geologorum Poloniae. 67: 217-229. gs

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

Kaminski, M. A. & Gradstein, F. M. (2005). Atlas of Palaeogene cosmopolitan deep-water agglutinated foraminifera. Grzybowski Foundation Special Publication. (10): 1-547. gs

King, C. (1989). Cenozoic of the North Sea. In, Jenkins, D. G. & Murray, J. W. (eds) Stratigraphical Atlas of Fossil Foraminifera, 2nd edn. Micropalaeontological Society Series . 418-489. gs

Annectina biedai compiled by the bforams@mikrotax project team viewed: 10-7-2026

Taxon Search:

Advanced Search

Short stable page link: https://mikrotax.org/bforams/index.php?id=2000193 Go to Archive.is to create a permanent copy of this page - citation notes

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

Add Comment

Comments

No comments yet. Be the first!