Dentoglobigerina sellii

Classification: pf_cenozoic -> Globigerinidae -> Dentoglobigerina -> Dentoglobigerina sellii
Sister taxa: D. juxtabinaiensis, D. binaiensis, D. sellii, D. tapuriensis ⟩⟨ D. baroemoenensis, D. larmeui, D. galavisi ⟩⟨ D. altispira, D. globosa, D. globularis ⟩⟨ D. prasaepis, D. pseudovenezuelana, D. taci, D. tripartita, D. eotripartita, D. venezuelana, D. sp.


Citation: Dentoglobigerina sellii (Borsetti, 1959)
Rank: species
Basionym: Globoquadrina obesa Akers, 1955
Taxonomic discussion:

We have investigated the holotype and paratypes of the almost entirely overlooked species Globoquadrina obesa Akers, 1955, described from the lower Miocene subsurface of Louisiana. Blow (1969, 1979) regarded it as a subspecies of larmeui and illustrated a form as Globoquadrina larmeui obesa Akers from the Pliocene. In our view Blow’s (1969, 1979) larmeui obesa is not conspecific with obesa and we have not investigated it further. Quilty (1976) also illustrated a form as ‘larmeui obesa’ that is not in our opinion related. Here we illustrate the holotype in SEM for the first time (Plate 11.10, Figs. 4-6) and assigned it to Dentoglobigerina sellii. The paratypes are assigned variously to sellii and larmeui and can be viewed at the Smithsonian Museum of Natural History website. It appears conspecific with Globoquadrina sellii Borsetti, and hence a potential senior synonym, but we recommend suppression of the name for the sake of nomenclatorial stability.

Globoquadrina sellii was described by Borsetti (1959) from Oligocene marls of Italy three years before the description by Blow and Banner (1962) of Globigerina oligocaenica from the lower Oligocene of Tanzania. Blow (1969) and all subsequent authors of which we are aware have regarded the two as synonyms. We illustrate both specimens in SEM for the first time (Plate 11.10, Figs. 1-3 and 10-12). The specimens are actually quite divergent in morphology: sellii has rather angular chamber shoulders and a distinct broad umbilical tooth, whereas oligocaenica is less angular and lacks a tooth. Most specimens illustrated in the literature have more in common with the oligocaenica morphotype than sellii. We considered whether the latter may in fact belong to the tripartita group, with which it shares several features. However, our study of sellii populations from the upper Oligocene and lower Miocene, close to the transition with D. binaiensis, has produced specimens similar to the holotype. Hence we regard oligocaenica and sellii as more phylogenetically primitive and advanced representatives, respectively, of the same evolving lineage.

Globigerina oligocaenica was described by Blow and Banner from the lower Oligocene of Tanzania. We have been unable to locate the type locality on the ground; it is from a higher stratigraphic level than the Eocene to lower Oligocene drill cores described by Pearson and Wade (2015), probably equivalent to uppermost Zone O1. We illustrate the holotype in SEM for the first time. It is a beautifully preserved specimen, showing clear affinity to D. tapuriensis from which the species has long been supposed to have evolved (Blow and Banner, 1962). Globigerina clarae was described by Bermúdez (1961) from Vera Cruz, Mexico. This species has long been considered a junior synoymn of sellii (e.g., Blow, 1979; Stainforth and Lamb, 1981).

Brönnimann and Resig (1971) described Globigerinoides pseudosellii from the lower Miocene of the southwest Pacific Ocean, for a sellii-like form with a supplementary aperture. This form was placed in synonymy with Globigerinoides sicanus by Fleisher (1974), with which we agree. [Wade et al. 2018]

Catalog entries: Globoquadrina obesa

Type images:

Distinguishing features: Like D. tapuriensis, but with more rapidly expanding chambers, a more flattened umbilical face to the final chamber, and a more spherical overall morphology.

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.


Wall type: Normal perforate, cancellate, probably spinose in life, densely pustulose with thin pustules well-distributed over the test.

Morphology: Globular, subspherical, rounded outline; in spiral view 3 embracing, elliptical shaped chambers that rapidly increase in size, final chamber makes up to two-thirds of the test size when fully formed; in edge view globular, rounded in outline; in umbilical view 3 embracing chambers in final whorl that rapidly increase in size, final chamber exhibiting a broad, rather flattened but not planar umbilical face; umbilicus low and broad, open, aperture umbilical a low arch, sometimes with a broad, triangular tooth (as in the holotype) but commonly without. [Wade et al. 2018]

Size: Maximum diameter of holotype 0.69 mm, minimum diameter 0.47 mm. [Wade et al. 2018]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Petaloidcoiling axis:Moderateperiphery:N/Aaperture border:Tooth
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:0.0-0.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: Occurs in low to mid-latitudes. [Wade et al. 2018]

Isotope paleobiology: Listed as a surface-dwelling form by Poore and Matthews (1984), although this may refer to a different species concept. [Wade et al. 2018]

Phylogenetic relations: Evolved from Dentoglobigerina tapuriensis and is ancestral to Dentoglobigerina binaiensis. [Wade et al. 2018]

Most likely ancestor: Dentoglobigerina tapuriensis - at confidence level 3 (out of 5). Data source: Wade et al. 2018.
Likely descendants: Dentoglobigerina binaiensis;

Biostratigraphic distribution

Geological Range:
Notes: The first occurrence of this species is within Zone O1. Blow and Banner (1962) used the concurrent range of oligocaenica and Pseudohastigerina barbadoensis to define the lower Oligocene G. oligocaenica Zone, which was later emended to the G. sellii / P. barbadoensis concurrent range zone (Zone P19) by Blow (1969). The lowest occurrence of sellii has still not been calibrated to paleomagnetics, but was found within what is now recognized as Zone O1 by Premoli Silva and Spezzaferri (1991) and Leckie and others (1993). The uppermost occurrence has been recorded at the base of lower Miocene Zone M5 by Leckie and others (1993) from ODP Hole 806B and within Subzone M5a in the equatorial Pacific Ocean (IODP Site U1337) by Pälike and others (2010). [Wade et al. 2018]
Last occurrence (top): within M5 zone (15.10-16.38Ma, top in Langhian stage). Data source: Wade et al. 2018
First occurrence (base): within O1 zone (32.10-33.90Ma, base in Priabonian stage). Data source: Wade et al. 2018

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.11 p.359


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Dentoglobigerina sellii compiled by the pforams@mikrotax project team viewed: 26-11-2020

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