lectotype: G. elongata
Catalog entries: Globigerina elongata
Type images:
lectotype: G. elongataDistinguishing features: Like Gs. ruber but chambers radially compressed
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.Coiling direction (in extant population): mixed
Morphology:
Size: >250µm
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical |
| sp chamber shape: | Globular | coiling axis: | Moderate | periphery: | N/A | aperture border: | N/A |
| umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | Sutural |
| spiral sutures: | Strongly depressed | umb depth: | Deep | wall texture: | Cancellate | shell porosity: | Macroperforate: >2.5µm |
| umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 4.0-4.0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
In modern oceans an abundant, warm water, species [SCOR WG138]
Geographic distribution:
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.
Most likely ancestor: Globigerinoides conglobatus - at confidence level 4 (out of 5). Data source: Morard et al. (2019) - based on mol gen data. NB Aurahs et al. (2011) suggested origin from G. extremus..
Likely descendants: Globigerinoides tenellus;
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:
André, A. et al. (2014). SSU rDNA Divergence in Planktonic Foraminifera: Molecular Taxonomy and Biogeographic Implications. PLoS One. 9: e104641-. gs V O 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. Marine Micropaleontology. 79: 1-14. gs d'Orbigny, A. (1826). Tableau methodique de la Classe de Cephalopodes. Annales des Sciences Naturelles, Paris. 7: 245-314. gs V O Morard, R. et al. (2019). Genetic and morphological divergence in the warm-water planktonic foraminifera genus Globigerinoides. PLoS One. 14(12): 1-30. gs V OReferences:
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Globigerinoides elongatus compiled by the pforams@mikrotax project team viewed: 19-4-2021
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