Globoturborotalita eolabiacrassata

Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita eolabiacrassata
Sister taxa: G. tenella, G. rubescens, G. decoraperta, G. apertura, G. connecta, G. druryi, G. nepenthes, G. woodi, G. cancellata, G. occlusa, G. paracancellata, G. pseudopraebulloides, G. barbula, G. bassriverensis, G. brazieri, G. eolabiacrassata, G. euapertura, G. gnaucki, G. labiacrassata, G. martini, G. ouachitaensis, G. sp.,


Citation: Globoturborotalita eolabiacrassata Spezzaferri and Coxall, in Spezzaferri et al. 2018
Rank: species
Taxonomic discussion:

A similar form identified as Globigerina cf. G. labiacrassata was identified at ODP Hole 1137A up to the upper Oligocene (Shipboard Scientific Party, 2000). This form probably corresponds to G. eolabiacrassata n. sp. The specimens identified as ‘Z. labiacrassata’ by Spezzaferri (1994) at DSDP Holes 667A (Subzone M1b) and 588C (Zone M5) can be attributed to G. eolabiacrassata n. sp.[Spezzaferri et al. 2018] 

Catalog entries: Globoturborotalita eolabiacrassata

Type images:

Distinguishing features:

Like G. bassriverensis but with more compact form and a thickened apertural rim.

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.


Diagnostic characters:

Globoturborotalita eolabiacrassata n. sp. differs from G. labiacrassata by its more compact profile, the less open and lower arched aperture and by the final chamber being smaller than the previous ones. It differs from G. bassriverensis in the more compact form and possession of a thickened apertural rim, and from G. martini in lacking a bulla on the primary aperture together with the more compact profile. It differs from G. woodi and G. brazieri by the lower arched aperture and by the thick lip. Globoturborotalita eolabiacrassata n. sp. is distinguished from G. cancellata, G. paracancellata, G. occlusa and G. pseudopraebulloides by its smaller size, the compact profile, the aperture bordered by the thick rim. It is distinguished from G. connecta by having 4 chambers in the last whorl, the more lobulate profile, the thick apertural rim and the ruber/sacculifer-type wall texture. Compared to G. ouachitaensis, G. eolabiacrassata has a less lobate outline and smaller/lower aperture, which in the latter is markedly rimmed. [Spezzaferri et al. 2018]

Wall type: Normal perforate, cancellate, spinose, ruber/sacculifer-type wall texture. Pore concentration between 12-14 pores/50 μm2 test surface area.

Test morphology: Low trochospiral, compact, consisting of 2½-3 whorls, slightly lobulate in profile outline. Both in spiral and umbilical views 4 subglobular chambers in the last whorl, increasing gradually in size. The last chamber is generally smaller than the previous ones, or it is equidimensional with the penultimate. The early whorl may not be visible because of calcite overgrowth in the figured specimens. The sutures are depressed and straight on both sides; umbilicus open but small, the single aperture is an umbilical, symmetrical or slightly asymmetrical, low rounded arch, bordered by a very thick rim. [Spezzaferri et al. 2018]

Size: Maximum diameter of the holotype is 0.15 mm. [Spezzaferri et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: This species is very frequent in the South Indian Ocean, Kerguelen Plateau, but it has been observed also in the tropical Indian Ocean and the equatorial Atlantic Ocean. [Spezzaferri et al. 2018]

Isotope paleobiology: No data available. [Spezzaferri et al. 2018]

Phylogenetic relations: Globoturborotalita eolabiacrassata evolved from G. bassriverensis (Olsson and others, 2006). It gave rise to G. labiacrassata in the lower Oligocene close to the boundary between Zones O1/O2. [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita bassriverensis - at confidence level 3 (out of 5). Data source: Olsson et al. 2006; Spezzaferri et al. 2018.
Likely descendants: Globoturborotalita labiacrassata;

Biostratigraphic distribution

Geological Range:
Notes: It appears in Eocene Zone E7 (Olsson and others 2006, pl. 6.3, fig. 19). We have observed it ranging up to Miocene Zone M5 in Hole 588C, Pacific Ocean (Spezzaferri, 1994). [Spezzaferri et al. 2018]
Last occurrence (top): within M5 zone (15.10-16.38Ma, top in Langhian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within E7 zone (45.72-50.20Ma, base in Ypresian stage). Data source: Olsson et al. 2006

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.242


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Globoturborotalita eolabiacrassata compiled by the pforams@mikrotax project team viewed: 5-7-2020

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