pforams@mikrotax - Globigerinoides bollii

Citation: Globigerinoides bollii Blow 1959

Basionym: Globigerinoides bollii Blow 1959

Synonyms:

Globigerinoides bollii Blow, 1959:189, pl. 10, figs. 65a-c [Miocene Globorotalia menardii menardii/Globigerina nepenthes Zone, Pozón Fm., Eastern Falcon, Venezuela].—Kennett and Srinivasan, 1983:70, pl. 15, figs. 4-6 [upper Miocene Neogloboquadrina continuosa Zone, DSDP Site 208, North Lord Howe Rise, South Pacific Ocean].—Bolli and Saunders, 1985:192, fig. 20(8) [holotype re-illustrated].—Spezzaferri, 1994:36, pl. 15, figs. 1a-c [lower Miocene Zone M2-M3 interval, DSDP Site 151, Gulf of Mexico].

Taxonomic discussion:

This species was originally described as ranging from the Miocene Globorotalia mayeri Zone (Vindobonian) to the Globigerina bulloides Zone. However, its range was extended into the lower Miocene Subzone M1b by Spezzaferri (1994). It first occurs after the radiation level of Globigerinoides (Spezzaferri, 1994) but it is very rare until the middle Miocene. Specimens at the beginning of the range possess only one very small supplementary aperture on the spiral side (Spezzaferri, 1994), whereas younger specimens may have 2 supplementary apertures (Blow, 1959; Kennett and Srinivasan, 1983). Keller (1981) suggested Globoturborotalita woodi as a possible direct ancestor for this species but that phylogenetic relationship is not retained here.

[Spezzaferri et al. 2018]

Distinguishing features:
Parent taxon (Globigerinoides): Supplementary apertures, with ruber/sacculifer-type spinose wall texture
This taxon: Small, compact, aperture almost circular. Supplementary sutural aperture on spiral side

Description

Compact, low trochospiral consisting of 2½-3 whorls. Outline subtriangular in 4 chambered specimens to subrectangular in 3½ chambered ones, the inner whorls are not visible because of the compact coiling; chambers embracing and subglobular; gradually increasing in size. Sutures slightly depressed, straight to slightly curved on both sides, umbilicus narrow and fairly deep. Primary aperture umbilical, a medium to rarely low semicircular arch. One (sometimes two) supplementary apertures occur on the spiral side ranging from a small and subcircular arch to a very small slightly arched slit placed on the suture between the last and the penultimate chambers. [Spezzaferri et al. 2018]

Normal perforate, spinose, ruber/sacculifer-type wall, strongly pustulose. [Spezzaferri et al. 2018]

Maximum diameter of holotype 0.34 mm. [Spezzaferri et al. 2018]

Biogeography and Palaeobiology

Typical of low latitudes, most abundant in the equatorial Atlantic Ocean (Spezzaferri, 1994). [Spezzaferri et al. 2018]

No data available. [Spezzaferri et al. 2018]

It probably evolved from Globigerinoides italicus in the middle part of Subzone M1b. [Spezzaferri et al. 2018]

Biostratigraphic distribution

Geological Range:
Notes: Rarely found from the middle part of Subzone M1b (Chaisson and Leckie, 1993; Spezzaferri, 1994) to the upper Pliocene Zone PL 4-5 interval (Kennett and Srinivasan, 1983). [Spezzaferri et al. 2018]
Last occurrence (top): within PL5 [Atl.] zone (2.39-3.13Ma, top in Gelasian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within M1b subzone (21.12-22.44Ma, base in Aquitanian stage). Data source: Spezzaferri et al. 2018

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.9 p.276; Kennett & Srinivasan 1983, p.70

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. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. 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

Chaisson, W. P. & Leckie, R. M. (1993). High-resolution Neogene planktonic foraminifer biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific). Proceedings of the Ocean Drilling Program, Scientific Results. 130: 137-178. gs

Keller, G. (1981a). Origin and evolution of the genus Globigerinoides in the Early Miocene of the northwestern Pacific, DSDP Site 292. Micropaleontology. 27(3): 293-304. gs

Keller, G. (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In, Kennett, J. P. (ed.) The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir . 163: 1-337. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. 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. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene to Lower Miocene Globigerinoides and Trilobatus. 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 9): 269-306. gs

test outline:	Ovate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low-moderate	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	Sutural
spiral sutures:	Strongly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	3.5-4	N.B. These characters are used for advanced search. N/A - not applicable