pforams@mikrotax - Subbotina projecta

Citation: Subbotina projecta Olsson, Pearson,&Wade, in Wade et al. 2018

Synonyms:

Globigerina sp. aff. yeguaensis Weinzierl and Applin.—Blow and Banner, 1962, pl. XI, figs. P, Q [lower Oligocene G. oligocaenica Zone, Lindi area, Tanzania]. [Not Weinzierl and Applin, 1929.]
Globigerina eocaena Gümbel.—Stainforth and others, 1975 (partim):268-270, fig. 115, no. 5-7 [upper Eocene Pachuta member, Yazoo Fm., Alabama]. [Not Gümbel, 1868.]
Subbotina ? yeguaensis (Weinzierl and Applin).—Leckie and others, 1993:125, pl. 3 (partim), fig. 2 [upper Oligocene Zone O7, ODP Hole 628A, Little Bahama Bank, western North Atlantic Ocean], fig. 6 [upper Eocene Zone E16, ODP Hole 628A, Little Bahama Bank, western North Atlantic Ocean]. [Not Weinzierl and Applin, 1929.]
Dentoglobigerina cf. globularis (Bermúdez).—Wade and others, 2007:172, pl. II, figs. a-d [upper Oligocene Zone O5, ODP Hole 1218B, equatorial Pacific Ocean]. [Not Bermúdez, 1961.]
Subbotina sp. Pearson and Wade, 2015:16, figs. 14.1-14.3, 14.5, 14.9 [lower Oligocene Zone O1, TDP 17, Stakishari, Tanzania], figs. 14.4, 14.6 [lower Oligocene Zone O1, TDP 12, Stakishari, Tanzania], fig. 14.7 [upper Eocene Zone E15/16, TDP 12, Stakishari, Tanzania], fig. 14.8 [lower Oligocene Zone O1, TDP 11, Stakishari, Tanzania].

Taxonomic discussion:

This species was referred to as “Subbotina sp. 2” in Wade and Pearson (2008). “Our specimens show clear spine holes indicating a spinose condition in life. The relatively free, loosely attached spherical chambers establish the relationship with other Subbotina species” rather than Dentoglobigerina (Pearson and Wade, 2015:16). [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. tecta but with higher trochospiral coiling, wider, deeper, and squarer umbilicus; also the teeth are often elongate

Description

“Test large, globular, 10 to 13 chambers arranged in three whorls, in a moderately high trochospiral, lobate, oval in outline, chambers spherical to subspherical; in spiral view 3½- 4 globular, embracing chambers in final whorl, increasing gradually in size, sutures straight or gently curved, moderately incised; in umbilical view 3½ globular chambers, increasing moderately rapidly in size, sutures depressed to incised, straight, umbilicus wide, square, deep, aperture umbilical, usually with teeth projecting into umbilicus from one or more chambers. Teeth vary from small and triangular to narrow elongate projections, often with a distinct rim or lip around the edges of the tooth that connect with the apertural lip; in edge view chambers globular in shape, embracing, teeth leaning into the umbilicus” (Pearson and Wade, 2015:18). [Wade et al. 2018]

Cancellate, spinose ruber/sacculifer-type wall texture.

Maximum diameter of holotype 0.50 mm. [Wade et al. 2018]

Biogeography and Palaeobiology

Probably restricted to low latitudes; currently known from the Gulf of Mexico, Indian Ocean (Tanzania), equatorial Pacific Ocean (ODP Sites 1218 and 803) and equatorial Atlantic Ocean (ODP Site 628). [Wade et al. 2018]

Multispecies stable isotope analysis from the lower Oligocene Zone O1 at Tanzania Drilling Project Site 12 indicates a positive δ18O signal consistent with a thermocline dwelling habitat (Wade and Pearson, 2008). [Wade et al. 2018]

Subbotina projecta n. sp. probably developed from S. tecta in the uppermost Eocene. [Wade et al. 2018]

Most likely ancestor: Subbotina tecta - at confidence level 2 (out of 5). Data source: Wade et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: Subbotina projecta n. sp. appears in the upper Eocene Zone E16 (Wade and Pearson, 2008 referred to as Subbotina sp. 2) and ranges through the Oligocene. Wade and others (2007) found specimens in upper Oligocene Zone O5, and Leckie and others (1993) have recorded specimens of Subbotina ? yeguaensis that are consistent with Subbotina projecta n. sp. in the uppermost Oligocene Zone O7 at ODP Sites 628 and 803. [Wade et al. 2018]
Last occurrence (top): within O7 zone (22.96-25.21Ma, top in Aquitanian stage). Data source: Wade et al. 2018 f.10.1
First occurrence (base): within E16 zone (33.90-34.68Ma, base in Priabonian stage). Data source: Wade et al. 2018

References:

Bermudez, P. J. (1961). Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleoceno-Reciente). Editorial Sucre, Caracas. (3): 1119-1393. 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

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

Pearson, P. N. & Wade, B. S. (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation for Foraminiferal Research, Special Publication. 45: 1-85. gs

Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Contributions, Articles. 62: 1-425. gs O

Wade, B. S. & Pearson, P. N. (2008). Planktonic foraminiferal turnover, diversity fluctuations and geochemical signals across the Eocene/Oligocene boundary in Tanzania. Marine Micropaleontology. 68: 244-255. gs

Wade, B. S., Berggren, W. A. & Olsson, R. K. (2007). The biostratigraphy and paleobiology of Oligocene planktonic foraminifera from the Equatorial Pacific Ocean (ODP Site 1218). Marine Micropaleontology. 62: 167-179. 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

Weinzierl, L. L. & Applin, E. R. (1929). The Claiborne Formation on the Coastal Domes. Journal of Paleontology. 3(4): 384-410. gs

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical
sp chamber shape:	Inflated	coiling axis:	Low	periphery:	N/A	aperture border:	Tooth
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Deep	wall texture:	Spinose	shell porosity:	Finely Perforate: 1-2.5µm
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

Subbotina projecta

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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