pforams@mikrotax - Globigerinella praesiphonifera

Citation: Globigerinella praesiphonifera (Blow, 1969)

Basionym: Hastigerina (Hastigerina) siphonifera praesiphonifera Blow, 1969

Synonyms:

Hastigerina siphonifera praesiphonifera Blow, 1969:408, pl. 54, figs. 7-9 [middle Miocene Zone N8, Aguide, Falcón, Venezuela].
Hastigerina praesiphonifera Blow.—Bolli and Saunders, 1985:251, fig.42 (5a-c) [holotype re-illustrated].
“Globorotalia” obesa Bolli/Globigerinella praesiphonifera (Blow).—Spezzaferri and Premoli Silva, 1991:303, pl. 4, fig. la-c [upper Oligocene/lower Miocene Zone N4, ODP Hole 709B, equatorial Indian Ocean].
Globigerinella praesiphonifera (Blow, 1969).—Spezzaferri, 1994:50, pl. 17, figs. 2a-c; 4a-d [lower Miocene Subzone N4a, ODP Hole 709B, equatorial Indian Ocean].
Not Globigerinella praesiphonifera (Blow, 1969).—Kennett and Srinivasan, 1983:238, pl. 60, figs. 1-3 [lower Miocene Zone N5, DSDP Site 289, western equatorial Pacific Ocean] (= G. obesa). [Spezzaferri et al. 2018]

Taxonomic discussion:

As mentioned above with respect to Globigerinella obesa, it is now clear that praesiphonifera has a bulloides-type wall and is not related to Hastigerina, as was originally suggested by Blow (1969) based on the Hastigerina-like near-planispiral coiling in obesa. Blow (1969) described Globigerinella praesiphonifera as having an initial trochospiral whorl of chambers with the last three chambers having a planispiral position and equatorial aperture. Oligocene populations of Globigerinella praesiphonifera are morphologically very similar to Blow’s species from the lower middle Miocene, except that the final chambers do not become fully planispiral. As noted by Spezzaferri (1994), the specimens reported by Kennett and Srinivasan (1983) (pl. 60, figs. 1-3) are considered transitional to G. obesa because the test is trochospirally coiled throughout. [Spezzaferri et al. 2018]

Distinguishing features: Like obesa but looser coiling and 5 slowly enlarging chambers in final whorl;

Description

Wall type: Spinose, spines are supported by spine collars which coalesce to form ridges. Pore concentrations average 90-100 pores/50 μm2 test surface area and pore diameters average 1.7 μm. [Spezzaferri et al. 2018]

Morphology: Test low trochospiral consisting of 3 whorls, lobulate in outline, chambers globular; in spiral view 5 globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, ultimate chamber may be reduced in size, sutures moderately depressed, straight, occasionally a small to very large secondary opening occurs at the spiral suture of the ultimate chamber; in umbilical view 5 globular, slightly embracing chambers, increasing moderately in size, ultimate chamber may be reduced in size, sutures moderately depressed, straight, umbilicus small, open, enclosed by surrounding chambers, aperture a low arch, umbilical-extraumbilical extending onto the peripheral edge, bordered by an imperforate rim; in edge view chambers globular in shape, slightly embracing. [Spezzaferri et al. 2018]

Size: Maximum diameter of holotype given as 0.62 mm. [Spezzaferri et al. 2018]

Biogeography and Palaeobiology

Geographic distribution: Identified in low to middle latitudes. [Spezzaferri et al. 2018]

Isotope paleobiology: Pearson and others (1997) found that the δ18O of G. praesiphonifera generally records values intermediate between shallow- and deep-water taxa. However its δ13C is considerably more negative than that of Dentoglobigerina venezuelana (see Chapter 11, this volume). They interpret the carbon isotope offset as a probable vital effect. [Spezzaferri et al. 2018]

Phylogenetic relations: Globigerinella praesiphonifera evolved from Globigerinella obesa (Bolli) in early Oligocene Zone O4 and gave rise to G. siphonifera in the early middle Miocene. [Spezzaferri et al. 2018]

Biostratigraphic distribution

Geological Range:
Notes: Forms transitional from G. obesa have been reported from Zone O4 with more typical morphologies from Zone O6/O7 (P22 in Spezzaferri, 1994). [Spezzaferri et al. 2018]
Last occurrence (top): within N13 zone (11.63-11.79Ma, top in Serravallian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within O4 zone (28.09-29.18Ma, base in Rupelian stage). Data source: Spezzaferri et al. 2018

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.6 p.200; Kennett & Srinivasan 1983, p.238

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. 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

Fox, L. R. & Wade, B. S. (2013). Systematic taxonomy of early–middle Miocene planktonic foraminifera from the equatorial Pacific Ocean: Integrated Ocean Drilling Program, Site U1338. Journal of Foraminiferal Research. 43: 374-405. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs V O

Pearson, P. N. & Shackleton, N. J. (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results. 144: 401-410. gs V O

Pearson, P. N., Shackleton, N. J., Weedon, G. P. & Hall, M. A. (1997b). Multispecies planktonic foraminifer stable isotope stratigraphy through Oligocene/Miocene boundary climatic cycles, Site 926. 154, 441-450. Proceedings of the Ocean Drilling Program, Scientific Results. 154: 441-450. gs

Pearson, P. N. et al. (2001a). Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs. Nature. 413: 481-487. 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., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. 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 6): 179-214. gs V O

test outline:	Lobate	chamber arrangement:	Pseudoplanispiral	edge view:	Concavo-convex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Globular	coiling axis:	Very low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Strongly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	5.0-5.0	N.B. These characters are used for advanced search. N/A - not applicable

Globigerinella praesiphonifera

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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