pforams@mikrotax - Globoturborotalita occlusa

Citation: Globoturborotalita occlusa (Blow&Banner, 1962)

Basionym: Globigerina praebulloides occlusa Blow and Banner 1962

Synonyms:

Globigerina praebulloides occlusa Blow and Banner 1962:93, pl. IX, figs. U-W [lower Oligocene, Globigerina oligocaenica Zone, Cipero Fm, Trinidad].—Bolli and Saunders, 1985:181, figs. 13.12-14 [holotype, lower Oligocene, Globigerina oligocaenica Zone, Cipero Fm, Trinidad].—Spezzaferri and Premoli Silva, 1991:247, pl. 8, fig. 1a-d [upper Oligocene, Zone P22, DSDP Hole 538A, Gulf of Mexico].
Globigerina occlusa Blow and Banner.—Stainforth and Lamb, 1981:pl. 6, figs. 4a-c [upper Oligocene, Globorotalia opima opima Zone, Sample Corehole 29-42, 4,925 to 4,940 feet, Gulf of Mexico].

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]

Distinguishing features:
Parent taxon (Globoturborotalita): Trochospiral test with a single, large, open umbilical aperture. Cancellate wall. 4-4½ chambers in final whorl
This taxon: Like G. cancellata but with more lobulate profile; 3½-4 well-developed chambers in the last whorl.

Description

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]

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

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

Biogeography and Palaeobiology

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]

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

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

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

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

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

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

Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). 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 16): 461-508. gs O

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. (2018d). 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, Papers. 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

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Concavo-convex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	3.5-4	N.B. These characters are used for advanced search. N/A - not applicable

Globoturborotalita occlusa

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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