CATALOG OF ORIGINAL DESCRIPTIONS: Globoturborotalita eolabiacrassata Spezzaferri & Coxall, in Spezzaferri et al 2018

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globoturborotalita -> Globoturborotalita eolabiacrassata
Other pages this level: G. barbula, G. bassriverensis, G. decorata, G. eolabiacrassata, G. paracancellata, G. pseudopraebulloides,

Globoturborotalita eolabiacrassata

Citation: Globoturborotalita eolabiacrassata Spezzaferri & Coxall, in Spezzaferri et al 2018
Rank: Species
Type locality: Kerguelen Plateau.
Type age: Lower Miocene, Subzone M1a,
Type sample and level: ODP Hole 1137A/12R/1, 65-69 cm,
Holotype Repository: Fribourg; Museum of Natural History of Fribourg, Switzerland.
Type & figured specimens: Holotype (32613) and paratypes (32614 and 32615)

Current identification/main database link: Globoturborotalita eolabiacrassata Spezzaferri and Coxall, in Spezzaferri et al. 2018


Original Description
Type of wall: 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.

Size: Maximum diameter of the holotype is 0.15 mm.

Extra details from original publication
DISTINGUISHING FEATURES:  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.
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.

PHYLOGENETIC RELATIONSHIPS: 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.

STRATIGRAPHIC RANGE: 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).

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.

References:

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In, Pearson, P. N. , Olsson, R. K. , Hemleben, C. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 5): 67-110. gs :: ::

Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica. 81: 1-187. gs :: ::

Spezzaferri, S., Olsson, R. K. & Hemleben, C. (2018b). Taxonomy, biostratigraphy, and phylogeny of Oligocene to Lower Miocene Globigerinoides and Trilobatus. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 9): 269-306. gs :: ::

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 8): 231-268. gs :: ::


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Globoturborotalita eolabiacrassata compiled by the pforams@mikrotax project team viewed: 5-6-2020

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