Subbotina corpulenta


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

Taxonomy

Citation: Subbotina corpulenta (Subbotina 1953)
Rank: Species
Basionym: Globigerina corpulenta
Synonyms: [Wade et al. 2018]
Taxonomic discussion:

Subbotina corpulenta can be common in Oligocene low latitude assemblages. The specimen selected for a holotype by Subbotina (1953) lacks a cantilevered ultimate chamber, but she discusses the common presence of a ‘bulla’ in the specimens she studied from Northern Caucasus. The ultimate chamber can be highly variable in S. corpulenta in terms of size, position and development; in some of our specimens it is well developed, appearing more as a cantilevered ultimate chamber with a lip or tooth. The name corpulenta indicating fat or stout is somewhat misleading. Our specimens are not particularly high-spired or portly, especially in comparison to large forms such as gortanii. [Wade et al. 2018]

As in Olsson and others (2006) we consider Globigerina pera Todd from the upper Eocene to be a junior synonym of Subbotina corpulenta, however, many specimens have been confused with Catapsydrax unicavus (see Chapter 4, this volume). Globigerinita riveroae Bermúdez is considered to be a junior synonym of Catapsydrax dissimilis (see Chapter 4, this volume). [Wade et al. 2018]

Globigerina hagni Gohrbandt (1967) was previously assigned to Subbotina by various authors including Poore and Brabb (1977) and Olsson and others (2006). Rögl and Egger (2012) re-examined and illustrated the type specimens described by Gohrbandt and concluded that S. hagni belonged in the genus Parasubbotina. We support their conclusions here. The specimens (not illustrated) assigned to S. hagni in Wade and Pearson (2008) with a stratigraphic range that extended into lower Oligocene Zone O1 are now considered to be S. corpulenta (see Pearson and Wade, 2015, for discussion). [Wade et al. 2018]

Catalog entries: Globigerina corpulenta, Globigerina pera, Globigerina protoreticulata, Globigerina bulloides cryptomphala, Globigerina turbulenta, Globigerina pseudoeocaena perfida

Type images:

Distinguishing features: Large adult test, lobulate with moderately elevated initial spire. Chambers globular, final chamber cantilevered and directed over the umbilicus.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters:

“The species is characterized by its generally large adult size, moderately elevated initial spire, lobulate test, globular chambers and the cantilevered ultimate chamber directed over the umbilicus” (Olsson and others, 2006:130). It is distinguished from Subbotina eocaena by its less developed lip and common bulla-like ultimate chamber. The frequency of a bulla-like chamber on S. corpulenta could lead to confusion with the genus Catapsydrax (e.g., Blow, 1979, pl. 247, fig. 10) and Subbotina gortanii (Leckie and others, 1993, pl. 3). However, S. corpulenta is distinguished from C. unicavus by its more lobate periphery, less compact coiling and generally more incised sutures, and from S. gortanii by its lower trochospire and more lobate periphery. [Wade et al. 2018]


Wall type: Cancellate, normal perforate, spinose. [Wade et al. 2018]

Test morphology: Test moderately high trochospiral, lobulate in outline, chambers globular, arranged in three whorls; in spiral view 4-4½ globular chambers in ultimate whorl, increasing moderately in size, sutures moderately depressed, straight to slightly curved; in umbilical view 4-4½ globular chambers, increasing moderately in size, often with a reduced ultimate chamber cantilevered over the umbilicus, sometimes centered and resembling a bulla, sutures moderately depressed, straight to slightly curved, umbilicus moderate in size, enclosed by surrounding chambers and often partly to entirely covered by the ultimate chamber, aperture umbilical, deep, with or without a lip; in edge view test with a moderately elevated initial whorl, chambers globular in shape, aperture generally not visible (modified from Olsson and others, 2006). [Wade et al. 2018]

Size: Maximum diameter of holotype 0.57 mm, thickness 0.38 mm. [Wade et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Moderate-highperiphery:N/Aaperture border:N/A
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Global in low to mid-latitudes. [Wade et al. 2018]

Isotope paleobiology: Wade and Pearson (2008) record relatively negative δ18O for S. corpulenta in the upper Eocene, but more positive δ18O relative to other species in the lower Oligocene. At IODP Site U1334 (equatorial Pacific Ocean), multispecies stable isotope investigations show that S. corpulenta has very similar δ18O and δ13C values to co-occurring S. minima and S. utilisindex (Moore and others, 2014). Poore and Matthews (1984) and Boersma and others (1987) record Globigerina perus and Catapsydrax perus, respectively (now considered junior synonyms of Subbotina corpulenta) as having the most positive δ18O of any planktonic foraminiferal species in the lower Oligocene. However, the specimens were not illustrated and we suspect that the analyzed specimens were of Catapsydrax, consistent with the stable isotope data and that S. corpulenta is rather rare in the assemblages. [Wade et al. 2018]

Phylogenetic relations: Probably evolved from Subbotina eocaena in Zone E7. [Wade et al. 2018]
NB Olsson et al. 2006 f6.2 considered it evlved from S. hagni.

Most likely ancestor: Subbotina eocaena - at confidence level 4 (out of 5). Data source: Wade et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: Subbotina corpulenta is first reported in Zone E7 but its extinction is not well constrained. We find specimens as young as Zone O3-O4 at ODP Site 1237 (see Pl. 10.2). Leckie and others (1993, pl. 3) illustrated specimens which they referred to as Globigerina gortanii, but we think are consistent with Subbotina corpulenta, ranging to the uppermost Oligocene. [Wade et al. 2018] As noted by many workers, the peak abundance of large subbotinids occurs in the middle to upper Eocene. They are less abundant in the uppermost Eocene, where they are replaced by various species of Dentoglobigerina. [Olsson et al. 2006
Last occurrence (top): within O4 zone (28.09-29.18Ma, top in Rupelian stage). Data source: Wade et al. 2018
First occurrence (base): within E7 zone (45.72-50.20Ma, base in Ypresian stage). Data source: Olsson et al. 2006

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.10 p.312; Olsson et al. 2006 - Eocene Atlas, chap. 6, p. 129

References:

Bandy, O. L. (1949). Eocene and Oligocene foraminifera from Little Stave Creek, Clarke County, Alabama. Bulletin of American Paleontology. 32(131): 1-210. 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

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. 2: 1-1413. gs

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 97-123. gs

Borsetti, A. M. (1959). Tre nuovo Foraminiferi plactonici dell'Oligocene Piacentino. Giornale di Geologia Series 2. 27: 205-212. gs

Charollais, J. et al. (1980). Les Marnes a foraminiferes et les schistes a Meletta des chaines subalpines septentrionales (Haute-Savoie, France). Eclogae Geologicae Helvetiae. 73(1): 9-69. gs

Cifelli, R. (1982). Early Occurrences and some Phylogenetic Implications of Spiny, Honeycomb Textured Planktonic Foraminifera. Journal of Foraminiferal Research. 12(2): 105-115. gs

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

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

Wade, B. S., Olsson, R. K., Pearson, P. N., Edgar, K. M. & Premoli Silva, I. (2018a). 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


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Subbotina corpulenta compiled by the pforams@mikrotax project team viewed: 22-10-2019

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