pforams@mikrotax - Subbotina utilisindex

Citation: Subbotina utilisindex (Jenkins & Orr 1973)

Basionym: Globigerina utilisindex

Synonyms:

“Globigerina sp. A” Beckmann, 1971:719, pl. 1, figs. 1-4 [lower Oligocene, DSDP Sites 69, 70, 72, eastern equatorial Pacific Ocean].
Globigerina utilisindex Jenkins and Orr, 1973:133-135, pl. 1, figs. 1-3 (partim; not paratype, pl. 1, figs. 4-6) [lower Oligocene, DSDP Hole 77B, eastern equatorial Pacific Ocean].
Subbotina utilisindex Jenkins and Orr.—Huber, 1991:441, pl. 5, fig. 6 [lower Oligocene Zone AP13, ODP Site 738, Kerguelen Plateau, southern Indian Ocean].—Nocchi and others, 1991:271, pl. 6, figs. 10-12 [lower Oligocene Zone P18-P20 (= Zone O1-O2), ODP Hole 703A, Subantarctic South Atlantic Ocean], figs. 16, 17 [lower Oligocene Subzone P21a (= Zone O3-O4), ODP Hole 703A, Subantarctic South Atlantic Ocean].—Spezzaferri and Premoli Silva, 1991:257, pl. XVI, figs. 4a-d [lower Oligocene Zone P19, DSDP Hole 538A, Gulf of Mexico].—Olsson and others, 2006:161-162, pl. 6.6, figs. 14, 15 [upper Eocene, Atlantic City Borehole, New Jersey, DSDP 150X], figs. 16-19 [lower Oligocene Zone AP13, ODP Hole 738B, Kerguelen Plateau, southern Indian Ocean], fig. 20 [middle Eocene Zone AP10, ODP Hole 748B, Kerguelen Plateau, southern Indian Ocean].
Subbotina angiporoides (Hornibrook).—Leckie and others, 1993:125, pl. 1, fig. 18 [lower Oligocene Zone P18, ODP Hole 628A, Little Bahama Bank, western North Atlantic Ocean], fig. 19 [lower Oligocene Zone P19, ODP Hole 803D, Ontong Java Plateau, western equatorial Pacific Ocean], fig. 20 [lower Oligocene Zone P19, ODP Hole 628A, Little Bahama Bank, western North Atlantic Ocean]. [Not Hornibrook, 1965.]
Not Globigerina utilisindex Jenkins and Orr, 1973, pl. 1, figs. 4-6 = Subbotina linaperta (Finlay) [lower Oligocene, DSDP Hole 77B, eastern equatorial Pacific Ocean]. [Not Finlay, 1939.]

[Wade et al. 2018]

Taxonomic discussion:

This species is common in lower Oligocene assemblages. Jenkins and Orr (1973) regarded S. utilisindex to be intermediate between S. linaperta and S. angiporoides. We consider the paratype specimens of Jenkins and Orr (1973) illustrated on pl. 1, figs. 4-6, to be more consistent with S. linaperta. Furthermore, some specimens illustrated by Leckie and others (1993) appear to morphologically converge with the S. angiporoides/minima group (see Plate 10.1). [Wade et al. 2018]

Distinguishing features:
Parent taxon (Subbotina): Low trochospiral, tripartite test, with 3-4 rapidly inflating, globular chambers in final whorl. Umbilicus nearly closed by tight coiling. Wall cancellate with spines at nodes of the ridges, +/- spine collars.
This taxon: Like S. linaperta but with more compact coiling, more equidimensional size of final whorl chambers; lower and more umbilical aperture, with less-developed lip; also less coarsely cancellate wall.

Description

Test trilobate, equatorial margin rounded; chambers coiled in compact, low trochospire, arranged in two whorls, chambers globular, final chamber comprising less than half of test; sutures radial to slightly curved, moderately depressed; umbilicus narrow, shallow; aperture a very low interiomarginal, umbilical-extraumbilical slit bordered by a narrow lip (modified after Olsson and others, 2006). [Wade et al. 2018]

Spinose, cancellate, normal perforate, ruber/sacculifer-type wall. [Wade et al. 2018]

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

Biogeography and Palaeobiology

“Cosmopolitan; particularly common in early Oligocene assemblages at southern, high latitudes. It may have been adapted to cold, nutrient rich waters” (Olsson and others, 2006:162). [Wade et al. 2018]

“Poore and Matthews (1984) and Wade and Kroon (2002) recorded this species as having _18O values intermediate between surface dwelling and benthic species, indicating a deep planktonic habitat” (Olsson and others, 2006:162). This interpretation is supported by multispecies stable isotope analyses from equatorial Pacific Ocean Site U1334 (Moore and others, 2014). [Wade et al. 2018]
Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light _¹³C and very heavy _¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Poore & Matthews (1984); Coxall et al. (2000); Wade & Kroon (2002)

Probably descended from S. linaperta during the late Eocene (Olsson and others, 2006). [Wade et al. 2018]

Most likely ancestor: Subbotina linaperta - at confidence level 2 (out of 5). Data source: Olsson et al. 2006 f6.2.

Biostratigraphic distribution

Geological Range:
Notes: “Originally recorded in the eastern equatorial Pacific (Jenkins and Orr, 1973). At southern, high latitudes Huber (1991) recorded S. utilisindex from the middle upper Eocene through lower Oligocene (Zones AE9-AO1)” (Olsson and others, 2006:161-162). The extinction of S. utilisindex is at the same level as the extinction of S. angiporoides in high latitudes (Nocchi and others, 1991), but precedes S. angiporoides in the Gulf of Mexico (Spezzaferri and Premoli Silva, 1991). [Wade et al. 2018]
Last occurrence (top): within O3 zone (29.18-30.28Ma, top in Rupelian stage). Data source: Wade et al. 2018 f10.1
First occurrence (base): within E15 zone (34.68-35.89Ma, base in Priabonian stage). Data source: Eocene Atlas

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.10 p.327; Olsson et al. 2006 - Eocene Atlas, chap. 6, p. 161

References:

Beckmann, J. P. (1971). The foraminifera of Sites 68 to 75. Initial Reports of the Deep Sea Drilling Project. 8: 713-726. gs

Berggren, W. A. (1992). Paleogene planktonic foraminifer magnetobiostratigraphy of the southern Kerguelen Plateau (sites 747-749). Proceedings of the Ocean Drilling Program, Scientific Results. 120: 551-568. gs

Finlay, H. J. (1939b). New Zealand foraminifera: Key species in stratigraphy - no. 2. Transactions of the Royal Society of New Zealand. 69(1): 89-128. gs

Finlay, H. J. (1939c). New Zealand foraminifera: Key species in stratigraphy - no. 3. Transactions of the Royal Society of New Zealand. 69(3): 309-329. gs

Hornibrook, N. d. B. (1965). Globigerina angiporoides n. sp. from the Upper Eocene and Lower Oligocene of New Zealand and the status of Globigerina angipora Stache, 1865. New Zealand Journal of Geology and Geophysics. 8(5): 834-838. gs

Huber, B. T. (1991c). Paleogene and Early Neogene Planktonic Foraminifer Biostratigraphy of Sites 738 and 744, Kerguelen Plateau (Southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 119: 427-449. gs

Jenkins, D. G. & Orr, W. N. (1973). Globigerina utilisindex n. sp. from the upper Eocene-Oligocene of the eastern equatorial Pacific. Journal of Foraminiferal Research. 3(3): 133-136. 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

Moore, T. C. et al. (2014). Equatorial Pacific Productivity Changes near the Eocene-Oligocene Boundary. Paleoceanography. 29: 825-844. gs

Nocchi, M., Amici, E. & Premoli Silva, I. (1991). Planktonic foraminiferal biostratigraphy and paleoenvironmental interpretation of Paleogene faunas from the subantarctic transect, Leg 114. Proceedings of the Ocean Drilling Program, Scientific Results. 114: 233-273. gs

Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006a). 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 O

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 O

Poore, R. Z. & Matthews, R. K. (1984). Oxygen isotope ranking of late Eocene and Oligocene planktonic foraminifers: implications for Oligocene sea-surface temperatures and global ice-volume. Marine Micropaleontology. 9: 111-134. 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

Wade, B. S., Olsson, R. K., Pearson, P. N., Edgar, K. M. & Premoli Silva, I. (2018b). Taxonomy, biostratigraphy, and phylogeny of Oligocene Subbotina. 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 10): 307-330. gs

Wade, B. S., Aljahdali, M. H., Mufrreh, Y. A., Memesh, A. M., AlSoubhi, S. A. & Zalmout, I. S. (2021). Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges. Journal of Micropalaeontology. 40: 145-161. gs O

test outline:	Subquadrate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Shallow	wall texture:	Spinose	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	3-3	N.B. These characters are used for advanced search. N/A - not applicable

Subbotina utilisindex

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

Add Comment

Comments