Globoturborotalita occlusa


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita occlusa
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 occlusa (Blow and Banner, 1962)
Rank: species
Basionym: Globigerina praebulloides occlusa Blow and Banner 1962
Synonyms:
Taxonomic discussion:

Banner and Blow (1962) described this species from the middle Eocene to the Aquitanian based on its similarity with specimens previously described in Bolli (1957) as Globigerina cf. trilocularis d’Orbigny 1832 (reported in Deshayes, 1832) from the middle Eocene Zone Globorotalia cocoaensis and from the Globigerina ciperoensis ciperoensis, respectively. However, the d’Orbigny species has 3 chambers in the last whorl, whereas G. occlusa has 4 chambers, and therefore does not show affinities with G. trilocularis.

Globoturborotalita occlusa has been considered by Blow and Banner (1962) as the oldest representative of the most primitive species of the G. praebulloides lineage, and the ancestor of Trilobatus quadrilobatus. This lineage is not retained here (see G. paracancellata, this chapter and Trilobatus quadrilobatus in Chapter 9, this volume). [Spezzaferri et al. 2018]

Catalog entries: Globigerina praebulloides occlusa

Type images:

Distinguishing features:

Like G. cancellata but with more lobulate profile; 3½-4 well-developed chambers in the last whorl.

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 occlusa differs from G. pseudopraebulloides and G. paracancellata by its low arched aperture and slightly more embracing chambers and from G. cancellata also by its more lobulate profile. It differs from G. woodi and G. brazieri by the low arched aperture, the more lobulate profile and the larger final chamber. It differs from G. connecta by the lobulate periphery, having 3½-4 well-developed chambers in the last whorl and the ruber/sacculifer instead of the sacculifer-type wall texture in G. connecta. It lacks the bulla-like final chamber typical of G. martini and has a maximum of 4 chambers in the last compared to the 4½ displayed by G. gnaucki. [Spezzaferri et al. 2018]


Wall type: Normal perforate, spinose, ruber/sacculifer-type wall texture, and an average of 46 pores/50 μm2 test surface area.

Test morphology: Low trochospiral, consisting of 3 whorls, the profile is lobulate; in both spiral and umbilical view 3½-4 globular chambers in the last whorl, increasing moderately to rapidly in size, the last chamber is about ⅓ of the test, the sutures are depressed and straight on both sides. In edge view chambers globular in shape and slightly embracing. The umbilicus is small but distinct, it is narrow and enclosed by surrounding chambers, the aperture is an umbilical very low arch without lip. [Spezzaferri et al. 2018]

Size: Holotype maximum diameter 0.37 mm. [Spezzaferri et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:N/A
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:3.5-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Global in low to mid-latitudes, including Tethys region. Most commonly described from the Atlantic Ocean. Ćorić and others (2012) report this species from the Serravallian of the Karaman high plain (Turkey, Konya Province). [Spezzaferri et al. 2018]

Isotope paleobiology: Stewart and others (2004) measured relatively negative δ18O for this species indicating a mixed-layer habitat. [Spezzaferri et al. 2018]

Phylogenetic relations: Globoturborotalita occlusa probably evolved from G. cancellata by developing a lower arched aperture and a more lobulate profile. [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita cancellata - at confidence level 2 (out of 5). Data source: Spezzaferri et al. 2018.
Likely descendants: Globoturborotalita pseudopraebulloides;

Biostratigraphic distribution

Geological Range:
Notes: Rare specimens attributed to this species are documented in ODP Leg 115 sites in the Indian Ocean in Zone O1 (Premoli Silva and Spezzaferri, 1990), however it commonly occurs from the lower Zone O4 (Spezzaferri, 1994). Ćorić and others (2012) report this species from the Serravallian (middle Miocene) of the Karaman high plain (Turkey, Konya Province). Like G. ouachitaensis, forms adhering strictly to the holotype are rare. [Spezzaferri et al. 2018]
Last occurrence (top): within Serravallian Stage (11.62-13.82Ma, top in Serravallian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within O1 zone (32.10-33.90Ma, base in Priabonian stage). Data source: Spezzaferri et al. 2018

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.254

References:

Banner, F. T. & Blow, W. H. (1962a). Fundamentals of mid-Tertiary Stratigraphical Correlation. . 1-163. gs

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

Bolli, H. M. & Saunders, J. B. (1985). Oligocene to Holocene low latitude planktic foraminifera. In, Bolli, H. M. , Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge, UK 155-262. gs

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 97-123. gs

Coric, S., Harzhauser, M., Rögl, F., İslamoğlu, I. & Landau, B. (2012). Biostratigraphy of some mollusc-bearing middle Miocene localities on the Karaman high plain (Turkey, Konya Province). Cainozoic Research. 9: 281-288. gs

Deshayes, G. P. (1832). Encyclopedie methodique: Histoire Naturelle des Vers., Tome 2,. Agasse Imprimeur, Paris. 1-594. gs

Premoli Silva, I. & Spezzaferri, S. (1990). Paleogene planktonic foraminifer biostratigraphy and paleoenvironmental remarks on paleogene sediments from Indian Ocean sites, Leg 115. Proceedings of the Ocean Drilling Program, Scientific Results. 115: 277-314. 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. (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

Stainforth, R. M. & Lamb, J. L. (1981). An evaluation of planktonic foraminiferal zonation of the Oligocene. University of Kansas Paleontological Contributions. 104: 1-34. gs

Stewart, D. R. M. , Pearson, P. N., Ditchfield, P. W. & Singano, J. M. (2004). Miocene tropical Indian Ocean temperatures: evidence from three exceptionally preserved foraminiferal assemblages from Tanzania. Journal of African Earth Sciences. 40: 173-190. gs


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Globoturborotalita occlusa compiled by the pforams@mikrotax project team viewed: 23-1-2020

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