Globigerinoides elongatus

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Globigerinoides -> Globigerinoides elongatus
Sister taxa: G. altiaperturus, G. conglobatus, G. diminutus, G. elongatus, G. extremus, G. mitra, G. obliquus, G. parawoodi, G. ruber, G. seigliei, G. subquadratus, G. tenellus, G. white, G. sp.,

Taxonomy

Citation: Globigerinoides elongatus (d'Orbigny, 1826)
Rank: species
Basionym: Globigerina elongata
Taxonomic discussion: Not usually distinguished from G. ruber in palaeontological studies (e.g. Aze et al. 2011) but now separated in modern fauna (eg SCOR WG138), following work of Aurahs et al. (2011) who showed that one of the most commonly recognised pseudo-cryptic genotypes within G. ruber - type IIa- was consistent with the species definition of Globigerinoides elongatus.

Catalog entries: Globigerina elongata;

Type images:

Short diagnosis: Three chambers & radially compressed

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


Test morphology:

Coiling direction (in extant population): mixed


Size: >250µm

Biogeography and Palaeobiology


Phylogenetic relations: Molecular Genotypes recognised (data from PFR2 database, June 2017. References: André et al. 2014; Aurahs et al. 2011).
NB These genotypes were previously classified as G. ruber IIa, but were reclassified as G. elongatus by  Aurahs et al. (2011), they also suggest it is most likely to have evolved from G. extremus.

Biostratigraphic distribution

Geological Range:
Notes: Rarely separated in the fossil record, but Aurahs et al. (2011) estimated a divergence age of 1.2-4.6Ma from molecular clock approach
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within Pliocene Epoch (2.59-5.33Ma, base in Zanclean stage). Data source: Perconig 1969, Aurahs et al. 2011

Plot of occurrence data:

References:

André, A. & others, (2014). SSU rDNA Divergence in Planktonic Foraminifera: Molecular Taxonomy and Biogeographic Implications. PLoS One, 9: e104641.

Aurahs, R.; Treis, Y.; Darling, K. & Kucera, M., (2011). A revised taxonomic and phylogenetic concept for the planktonic foraminifer species Globigerinoides ruber based on molecular and morphometric evidence. Mar. Micropaleontol., 79: 1–14.

d'Orbigny, A., (1826). Tableau methodique de la Classe de Cephalopodes. Annals des Sciences Naturelles, Paris, 7: 245-314.


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Globigerinoides elongatus compiled by the pforams@mikrotax project team viewed: 19-10-2017

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