Globoturborotalita ouachitaensis


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita ouachitaensis
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 ouachitaensis (Howe & Wallace 1932)
Rank: Species
Basionym: Globigerina ouachitaensis
Synonyms: [Spezzaferri et al. 2018]
Taxonomic discussion:

When the Atlas of Eocene Planktonic Foraminifera was published the holotype of G. ouachitaensis was not available (Olsson and others, 2006). Its wall texture was described as sacculifer-type. Now that we have SEM images for comparison it is apparent that some specimens attributed to G. ouachitaensis by Olsson and others (2006) do not strictly adhere to the holotype morphology and that the wall texture of the holotype is ruber/sacculifer-type. These have been variably assigned to G. pseudopraebulloides Olsson and Hemleben (2018) and G. bassriverensis Olsson and Hemleben. Forms adhering strictly to the holotype are rare. For additional discussion of this species see Olsson and others (2006). [Spezzaferri et al. 2018]

Globoturborotalita ouachitaensis first appears in the middle Eocene where it is a minor component of planktonic foraminiferal assemblages. It is apparently the stem species for the late Eocene radiation of Globoturborotalita. Globigerina turcmenica of Khalilov (1956) may be a synonym, but due to confusion over the specimens in the collections of Khalilov that are not the same as the illustration of the holotype, and the apparent loss of the holotype, it is recommended that turcmenica be considered nomen dubium non conservandum. [Olsson et al. 2006]

Catalog entries: Globigerina ouachitaensis, Globigerina bollii lentiana

Type images:

Distinguishing features: Test small, 4 globular, slightly embracing, chambers in final whorl. Aperture umbilical; wall texture cancellate, spinose.

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 ouachitaensis can be distinguished from the other species of Globoturborotalita by its overall smaller size, the rather gradual rate of chamber size increase in the final whorl, the reduced size of the final chamber compared to the penultimate, and the low arched aperture tending to the peripheral margin. These features give a distinctive diamond-shape to the peripheral outline. Globoturborotalita ouachitaensis differs from G. eolabiacrassata Spezzaferri and Coxall n. sp. by its higher arched aperture, the absence of the very thick rim bordering the aperture and for the distinctive diamond-shape outline missing in G. eolabiacrassata. [Spezzaferri et al. 2018]


Wall type: Cancellate, normal perforate, spinose, ruber/sacculifer-type wall structure, an average of 27 pores/50 μm2 test surface area. [Spezzaferri et al. 2018]

Test morphology:

Test small, moderately low trochospiral consisting of 4 whorls. The profile is diamond-shape and lobulate, chambers globular; in spiral view 4 globular, slightly embracing chambers in ultimate whorl, increasing slowly in size, sutures depressed, straight; in umbilical view 4 globular, slightly embracing chambers, increasing slowly in size, sutures depressed, straight. The last chamber is smaller than the previous ones. The umbilicus is small but open, enclosed by surrounding chambers, aperture umbilical tending towards the peripheral margin, a low arch, bordered by a lip; in edge view chambers globular in shape, slightly embracing, initial spire of chambers slightly elevated.

[Spezzaferri et al. 2018]

Size: Holotype maximum diameter 0.19 mm. [Spezzaferri et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:Thick lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly 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: Distributed in mid- to low latitudes, the Tethys region and North Atlantic Ocean. [Spezzaferri et al. 2018]

Isotope paleobiology: Globoturborotalita ouachitaensis records the most negative δ18O of an upper Eocene assemblage from Tanzania (Wade and Pearson, 2008), indicating a shallow, warm water habitat. Sexton and others (2006) similarly suggest that G. ouachitaensis from the western North Atlantic Ocean, together with other co-occurring species of Globoturborotalita, inhabited the mixed-layer during winter months. [Spezzaferri et al. 2018]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): Wade & Pearson (2008)

Phylogenetic relations: Globoturborotalita ouachitaensis probably originated from Globoturborotalita bassriverensis Olsson and Hemleben, by modification of the chamber arrangement and opening of the aperture to give the diamond-shaped outline of the peripheral margin. [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita bassriverensis - at confidence level 4 (out of 5). Data source: Olsson et al. 2006, f5.1; Spezzaferri et al. 2018.
Likely descendants: Globoturborotalita barbula; Globoturborotalita gnaucki;

Biostratigraphic distribution

Geological Range:
Notes: Zone E10 (Olsson and others, 2006) to Subzone M1b (this study). [Spezzaferri et al. 2018]
Last occurrence (top): within M1b subzone (21.12-22.44Ma, top in Aquitanian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within E10 zone (41.89-43.23Ma, base in Lutetian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.256; Olsson et al. 2006 - Eocene Atlas, chap. 6, p. 122

References:

Blow, W. H. & Banner, F. T. (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In, Eames, F. E. , Banner, F. T. , Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs

Charollais, J. et al. (1980). Les Marnes a foraminiferes et les schistes a Meletta des chaines subalpines septentrionales (Haute-Savoie, France). Eclogae Geologicae Helvetiae. 73(1): 9-69. gs

Cicha, I., Rögl, F., Rupp, C. & Ctyroká, J. (1998). Oligocene-Miocene foraminifera of the central Paratethys. Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft. 549: 1-325. gs

Howe, H. V. & Wallace, W. E. (1932). Foraminifera of the Jackson Eocene at Danville Landing on the Ouachita, Catahoula Parish, Louisiana. Bulletin of the Geological Survey of Louisiana. 2: 1-118. gs

Khalilov, D. M. (1956). 0 pelagicheskoy faune foraminifer Paleogenovykh otlozheniy Azerbaydzhana [Pelagic Foraminifera of the Paleogene Deposits of the Azerbaizhan SSR]. Trudy Instituta Geologii, Akademiya Nauk Azerbaidzhanskoi SSR. 17: 234-255. gs

Leckie, R. M., Farnham, C. & Schmidt, M. G. (1993). Oligocene planktonic foraminifer biostratigraphy of Hole 803D (Ontong Java Plateau) and Hole 628A (Little Bahama Bank), and comparison with the southern high latitudes. Proceedings of the Ocean Drilling Program, Scientific Results. 130: 113-136. 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

Pearson, P. N. & Wade, B. S. (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation for Foraminiferal Research, Special Publication. 45: 1-85. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. 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

Samanta, B. K. (1970). Middle Eocene Planktonic Foraminifera from Lakhpat, Cutch, Western India. Micropaleontology. 16(2): 185-215. 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. & Premoli Silva, I. (1991). Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico. Palaeogeography, Palaeoclimatology, Palaeoecology. 83: 217-263. 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

Wade, B. S. & Pearson, P. N. (2008). Planktonic foraminiferal turnover, diversity fluctuations and geochemical signals across the Eocene/Oligocene boundary in Tanzania. Marine Micropaleontology. 68: 244-255. gs

Warraich, M. Y. & Ogasawara, K. (2001). Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan. Science Reports of the Institute of Geosciences, University of Tsukuba, Section B = Geological Sciences. 22: 1-59. gs


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Globoturborotalita ouachitaensis compiled by the pforams@mikrotax project team viewed: 5-12-2019

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