Subbotina yeguaensis


Classification: pf_cenozoic -> spinose -> Globigerinidae -> Subbotina -> Subbotina yeguaensis
Sister taxa: S. roesnaesensis, S. tecta, S. jacksonensis, S. corpulenta, S. hagni, S. eocaena, S. gortanii, S. crociapertura, S. yeguaensis, S. senni, S. triangularis, S. utilisindex, S. angiporoides, S. linaperta, S. patagonica, S. hornibrooki, S. cancellata, S. velascoensis, S. triloculinoides, S. trivialis, S. sp.,

Taxonomy

Citation: Subbotina yeguaensis (Weinzierl and Applin 1929)
Rank: Species
Basionym: Globigerina yeguaensis
Synonyms:
Taxonomic discussion: Blow (1979) included Subbotina yeguaensis in his new genus Dentoglobigerina, believing that it was an intermediate species between D. galavisi (Bermúdez) and D. pseudovenezuelana (Blow and Banner). This was apparently based on his concept of a “central type” for D. galavisi, which are forms from the middle Eocene. However, these forms do not fit the central morphology of D. galavisi which was described from the upper Eocene Jackson Formation, Mississippi, which spans from Zones E15-16 (see holotype Pl. 13.1, Figs. 1-3, this volume and discussion under D. galavisi). Subbotina yeguaensis is spinose and lacks the triangular lip that characterizes the nonspinose genus Dentoglobigerina and, therefore, cannot be placed as an intermediate species in a Dentoglobigerina lineage.
Subbotina yeguaensis was described from the middle Eocene subsurface of Louisiana where it is common. The holotype of Subbotina pseudoeocaena (Subbotina) which is described from the lower/middle Eocene of the northern Caucasus has the morphologic characteristics of S. yeguaensis and is considered a junior synonym (see Pl. 6.18, Figs. 13-15), as is Subbotina angiporoides lindiensis of Blow (1979) and possibly Globigerina pseudoeocaena Subbotina var. ellipsocamerata Khalilov (1956; viewed by WAB). [Olsson et al. 2006]

Catalog entries: Globigerina pseudoeocaena; Globigerina yeguaensis;
Subbotina angiporoides lindiensis;

Type images:

Short diagnosis: Test lobulate, moderately elevated trochospire. Aperture with somewhat broad lip that tapers both anteriorly and posteriorly.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: The species is characterized by its lobulate test and moderately elevated trochospire, and the somewhat broad apertural lip that tapers both anteriorly and posteriorly. [Olsson et al. 2006]

Wall type: Normal perforate, symmetrically cancellate, sacculifer-type wall texture, spinose. [Olsson et al. 2006]

Test morphology: Test moderately elevated, trochospiral, globular, lobulate in outline, chambers globular; in spiral view 3 1/3 globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, ultimate chamber may be equal to or smaller in size than penultimate chamber, sutures moderately depressed, straight; in umbilical view 3 1/3 globular, slightly embracing chambers, increasing moderately in size, sutures moderately depressed, straight, umbilicus small, enclosed by surrounding chambers, aperture umbilical, bordered by a somewhat broad lip that tapers both anteriorly and posteriorly, ultimate chamber may be equal to or smaller than the penultimate chamber; in edge view moderately elevated trochospire, chambers globular in shape, somewhate embracing, aperture visible as a low rounded opening, bordered by a somewhat broad lip. [Olsson et al. 2006]

Size: Maximum diameter of holotype 0.52 mm, thickness 0.40 mm. [Olsson et al. 2006]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
umb chamber shape:Globularcoiling axis:Moderate-highperiphery:N/Aaperture border:Thick lip
sp chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Moderately depresseddiameter mm:0.52width mm:breadth mm:0.4
final-whorl chambers:3.0-3.0

Biogeography and Palaeobiology


Geographic distribution: Global in low to high latitudes. [Olsson et al. 2006]
Aze et al. 2011 summary: Cosmopolitan; based on Olsson et al. (2006a)

Isotope paleobiology: Boersma and others (1987) record strongly positive ∂18O for this species indicating a deep planktonic habitat. [Olsson et al. 2006]
Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light δ13C and very heavy δ18O. Sources cited by Aze et al. 2011 (appendix S3): Boersma et al. (1987); Coxall et al. (2000)

Phylogenetic relations: Subbotina yeguaensis belongs to a group of subbotinids with symmetrical cancellate (sacculifer-type) wall texture. It apparently arose in the early Eocene, possibly from S. eocaena. [Olsson et al. 2006]

Most likely ancestor: Subbotina roesnaesensis - at confidence level 4 (out of 5). Data source: Olsson et al. 2006 f6.2.

Biostratigraphic distribution

Geological Range:
Notes: Zone E7 to Zone E16. [Olsson et al. 2006]
Last occurrence (top): within E16 zone (33.90-34.68Ma, top in Priabonian stage). Data source: Eocene Atlas
First occurrence (base): within E7 zone (45.72-50.20Ma, base in Ypresian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Olsson et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 6, p. 162

References:

Belford, D.J., (1984). Tertiary foraminifera and age of sediments, Ok Tedi-Wabag, Papua New Guinea. Bureau of Mineral Resources, Australia, Bulletin, 216: 1-52.

Blow, W.H. & Banner, F.T., (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In: Eames, F.E. et al. (Editors), Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge, pp. 61-151.

Blow, W.H., (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In: Bronnimann, P. and Renz, H.H. (Editors), Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967, Leiden, Netherlands, pp. 380-381.

Blow, W.H., (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden, 1413 pp.

Bolli, H.M. & Saunders, J.B., (1985). Oligocene to Holocene low latitude planktic foraminifera. In: Bolli, H.M., Saunders, J.B. and Perch-Neilsen, K. (Editors), Plankotn Stratigraphy. Cambridge University Press, Cambridge, UK, pp. 155-262.

Bolli, H.M., (1957). Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 155-172.

Huber, B.T., (1991). Paleogene and early Neogene planktonic foraminifer biostratigraphy of ODP Leg 119 Sites 738 and 744, Kerguelen Plateau (southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results, 119: 427-449.

Huber, B.T., (1991). Paleocene 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.

Khalilov, D.M., (1956). Pelagic foraminifera of the Paleogene deposits of the Azerbaidzhan SSR. Acad. Nauk SSSR Geol., Inst. Trudy, 17(234-261).

Khalilov, D.M., (1956). 0 pelagicheskoy faune foraminifer Paleogenovykh otlozheniy Azerbaydzhana [Pelagic Foraminifera of the Paleogene Deposits of the Azerbaizhan SSR]. Trudy Instituta Geologii, Akademiya Nauk Azerbaidzhanskoi SSR, 17: 234-255.

Krasheninnikov, V.A. & Basov, I.A., (1983). Stratigraphy of Cretaceous sediments of the Falkland Plateau based on planktonic foraminifers, Deep Sea Drilling Project, Leg 71. In: Ludwig, W.J., Krasheninnikov, V.A. and al., e. (Editors), Initial Reports of the Deep Sea Drilling Project. U.S. Government Printing Office, Washington, D.C., pp. 789-820.

Nishi, H. & Chaproniere, G.C.H., (1994). Eocene-Oligocene subtropical planktonic foraminifers at Site 841,. Proceedings of the Ocean Drilling Program, Scientifc Results, 135: 245-266.

Olsson, R.K.; Hemleben, C.; Huber, B.T. & Berggren, W.A., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Globigerina, Globoturborotalita, Subbotina, and Turborotalita. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Allen Press, Lawrence, Kansas, pp. 111-168.

Olsson, R.K.; Pearson, P.N. & Huber, B.T., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Cushman Foundation Special Publication. Allen Press, Lawrence, Kansas, pp. 67-110.

Saito, T., (1962). Eocene planktonic foraminifera from Hahajima (Hillsborough Island). Trans. Proc. Pal. Soc. Japan, 1(45): 209-225.

Warraich, M.Y. & Ogasawara, K., (2001). Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan. Science Reports of the Institute of Geosciences, University of Tsukuba, Section B = Geological Sciences, 22: 1-59.

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


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Subbotina yeguaensis compiled by the pforams@mikrotax project team viewed: 15-12-2017

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