pforams@mikrotax - Globigerinoides tenellus

Globigerinoides tenellus

Classification: pf_cenozoic -> Globigerinidae -> Globigerinoides -> Globigerinoides tenellus
Sister taxa: G. tenellus, G. elongatus, G. conglobatus, G. ruber ⟩⟨ G. obliquus, G. extremus, G. altiaperturus, G. eoconglobatus, G. joli, G. neoparawoodi ⟩⟨ G. kennetti, G. bollii, G. italicus ⟩⟨ G. mitra, G. seigliei, G. subquadratus, G. diminutus ⟩⟨ G. bulloideus, G. sp.

LoeblichTappan 1994 pl204 09-11.JPG
LoeblichTappan 1994 pl198 10-12.JPG
K_S 1983 17-7.JPG
LoeblichTappan 1994 pl198 07-9.JPG
LoeblichTappan 1994 pl198 13-15.JPG

Taxonomy

Citation: Globigerinoides tenellus Parker, 1958

Rank: species

Basionym: Globigerinoides tenellus Parker, 1958

Synonyms:

Globoturborotalita tenellus (Parker, 1958)

Taxonomic discussion: This species was decribed in Globigerionoides but has been placed in Globoturborotalita in most modern analyses, based on the inference that it most likely evolved from Globoturborotalita rubescens (e.g. Kennett & Srinivasan 1983; Aze et al. 2011, Schiebel & Hemleben (2017). However, Morard et al. (2019) used molcular genetics and ontogenetic reconstructions to show that the species nested inside the clade of extant Globigerinoides species and that it was closely related to G. elongatus and G. conglobatus. Based on this they reccomended transfering it back into Globigerinoides.

Catalog entries: Globigerinoides tenella

Type images:

holotype: G. tenella
holotype: G. tenella
x: G. tenella

Distinguishing features: Like G. rubescens but with a small, supplementary aperture.

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

Wall type: Spinose; Cancellate [Aze 2011]

Morphology: Test small, low trochospire , chambers spherical, four in the final whorl, rapidly increasing in size as added; sutures cllrved and depressed; surface distinctly cancellate with pores set in polygonal pore pits; primary aperture umbilical large, almost circular in outline, with a distinct rim; single small, supplementary aperture on spiral side at intersection of spiral and intercameral sutures. [Kennett & Srinivasan 1983]

Size: >250µm

Character matrix

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Concavo-convex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Moderate	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	Sutural
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4.0-4.0	N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: Tropical to temperate. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

In modern oceans a common, warm water, species [SCOR WG138]

Isotope paleobiology: Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on ∂¹³C lighter than species with symbionts; also with relatively light ∂¹⁸O Cited sources (Aze et al. 2011 appendix S3): this study

Phylogenetic relations: Gs. tenellus is similar to Globigerina (Zeaglobigerina) rubescens in all respects except for the development of a small, supplementary aperture. This species evolved from Gg. (Zg.) rubescens in the Late Pliocene. [Kennett & Srinivasan 1983]

Most likely ancestor: Globigerinoides elongatus - at confidence level 5 (out of 5). Data source: Morard et al. (2019) - based on mol gen data. NB Kennett & Srinivasan 1983 had suggested origin from G. rubescens.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N21 zone (1.93-3.10Ma, base in Piacenzian stage). Data source: Chaisson & Pearson (1997)

Plot of occurrence data:

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
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Globigerinoides tenellus, synonyms included - Globigerina tenella; Globigerinoides tenellus; Globoturborotalita tenella; Globigerinoides tenella;
See also space-time plot :: Samples map :: Parent: Globigerinoides

Primary source for this page: Kennett & Srinivasan 1983, p.80 (as Globigerinoides tenellus)

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

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

Loeblich, A. & Tappan, H. (1994). Foraminifera of the Sahul shelf and Timor Sea. Cushman Foundation for Foraminiferal Research, Special Publication. 31: 1-661. 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 O

Parker, F. L. (1958). Eastern Mediterranean foraminifera. Reports of the Swedish Deep-Sea Expedition, 1947-1948. 8(4): 217-283. gs

Schiebel, R. & Hemleben, C. (2017). Planktic Foraminifers in the Modern Ocean. Springer-Verlag, . 1-358. gs

Globigerinoides tenellus compiled by the pforams@mikrotax project team viewed: 5-3-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/pforams/index.php?id=104070 Go to Archive.is to create a permanent copy of this page - citation notes

Comments (1)

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Arianna

hello! Is the name Globoturborotalita tenella still accepted? according to other sources it is now called Globigerinoides tenellus.

25th September 2020 2:25pm

Jeremy Young (Tonbridge, UK)

Both names are valid under nomenclatural rules. Most workers use Globoturborotalita tenella (e.g Aze et al. 2011, Darling & Wade 2008, Schiebel & Hemleben 2017) and there is geological evidence for tenella evolving from rubescens (e.g Kennett & Srinivasan 1983), and they are very mlar morphologically. However, the SCOR working group (Brummer & Kucera 2014, 2015), do use Globigerinoides tenellus, presumably because it has a supplementary aperture. I don't think there is molecular genetic data available, yet, for the species.

Jeremy

27th September 2020 9:33pm

Arianna

thank you for your reply

28th September 2020 8:26am

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