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.,

Taxonomy

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

Description


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

References:

Bandy, O. L. (1949). Eocene and Oligocene foraminifera from Little Stave Creek, Clarke County, Alabama. Bulletin of American Paleontology. 32(131): 1-210. gs

Hooyberghs, H. J. F. & de Meuter, F. (1972). Biostratigraphy and inter-regional correlation of the Miocene deposits of Northern Belgium based on planktonic foraminifera; the Oligocene-Miocene boundary on the southern edge of the North Sea basin, Brussels. Koninklijke Vlaamse Academie voor Wetenschappen, Letteren en Schone Kunsten van België.. -. gs

Huber, B. T. (1991c). Paleogene and Early Neogene Planktonic Foraminifer Biostratigraphy of Sites 738 and 744, Kerguelen Plateau (Southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 119: 427-449. gs

Jenkins, D. G. (1965b). Planktonic Foraminiferal zones and new taxa from the Danian to lower Miocene of New Zealand. New Zealand Journal of Geology and Geophysics. 8(6): 1088-1126. gs

Olsson, R. K. & Hemleben, C. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Globanomalina, Planoglobanomalina n. gen and Pseudohastigerina. 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 14): 413-432. gs

Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Globigerina, Globoturborotalita, Subbotina, and Turborotalita. 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 6): 111-168. gs

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

Quilty, P. G. (1976). Planktonic foraminifera DSDP Leg 34, Nazca Plate. Initial Reports of the Deep Sea Drilling Project. 34: 629-703. gs

Rögl, F. (1969a). Die Foraminiferenfauna aus den Phosphoritsanden von Plesching bei Linz (Oberosterreich) - Ottnangien (Untermiozan). Sonderdruck aus Mitteilungen der Geologischen Gessellschaft in Wien. 213-234. gs

Sexton, P. E., Wilson, P. A. & Pearson, P. N. (2006). Palaeoecology of late middle Eocene planktic foraminifera and evolutionary implications. Marine Micropaleontology. 60: 1-16. 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., 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

Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs

Szekely, S. -F. & Filipescu, S. (2016). Biostratigraphy and paleoenvironments of the Late Oligocene in the north-western Transylvanian Basin revealed by the foraminifera assemblages. Palaeogeography, Palaeoclimatology, Palaeoecology. 449: 484-509. gs


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Globoturborotalita eolabiacrassata compiled by the pforams@mikrotax project team viewed: 6-12-2019

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