pforams@mikrotax - Subbotina tecta pforams@mikrotax - Subbotina tecta

Subbotina tecta

Classification: pf_cenozoic -> Globigerinidae -> Subbotina -> Subbotina tecta
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.


Citation: Subbotina tecta Pearson & Wade 2015
taxonomic rank: Species
Taxonomic discussion:

“A specimen of S. tecta was illustrated by Olsson and others (2006, plate 6.18, fig. 12) as S. yeguaensis. In the past, other specimens may have been assigned to either D. galavisi or S. yeguaensis (possibly including the specimen illustrated as Globigerina yeguaensis by Postuma, 1971); however, S. tecta is a very distinctive morphotype which may be confined to the uppermost Eocene and lowermost Oligocene” (Pearson and Wade, 2015:15). In addition to the holotypes and paratypes illustrated from Tanzania (Pearson and Wade, 2015, figs. 12.1-12.3, 13.1-13.7), we have found comparable specimens from DSDP Site 242 (Indian Ocean), ODP Site 647 (North Atlantic Ocean), IODP Site U1334 (equatorial Pacific Ocean) and the US Gulf Coast. Referred to as Subbotina sp. 1 in Wade and Pearson (2008). [Wade et al. 2018]

Catalog entries: Subbotina tecta

Type images:

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. eocaena but with more spherical chambers, a large, prominent, apertural tooth.

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.


10-13 near spherical chambers arranged in three whorls in “a low trochospiral, oval and strongly lobate in outline; in spiral view 3½ to occasionally 4 globular, embracing chambers in final whorl, increasing rapidly in size, sutures straight and depressed, becoming moderately incised between later chambers; in umbilical view 3½ globular chambers, increasing rapidly in size, sutures depressed to incised, straight, umbilicus small, aperture umbilical to slightly extraumbilical in position, obscured by a distinctive trapezoidal to triangular, non-porous, often pustulose tooth, with relict teeth of earlier chambers sometimes visible, the adjacent chamber shoulders sometimes distinctly pustulose; in edge view chambers globular in shape, embracing, tooth convex and arching over the umbilicus. Coiling direction is approximately random” (Pearson and Wade, 2015:15). [Wade et al. 2018]

Wall type:
Symmetrically cancellate, ruber/sacculifer-type wall texture, spinose. [Wade et al. 2018]

Maximum diameter of holotype 0.61 mm. [Wade et al. 2018]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Tooth
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Spinoseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.5-4 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Similar species

Distinguished from S. yeguaensis by having a lower trochospire and less embracing, more spherical chambers.

Geographic distribution
Global, but most common in low and mid-latitudes, so far known to occur in the western Indian Ocean, equatorial Pacific Ocean, Caribbean Sea, Gulf of Mexico and Labrador Sea. [Wade et al. 2018]

Isotope paleobiology
No data available. [Wade et al. 2018]

Phylogenetic relations
Subbotina tecta descended from S. eocaena in the uppermost Eocene and forms a phylogenetic link to S. projecta n. sp. [Wade et al. 2018]

Most likely ancestor: Subbotina eocaena - at confidence level 3 (out of 5). Data source: Pearson & Wade 2015, p14.
Likely descendants: Subbotina projecta; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Subbotina tecta has a restricted range, confined to upper Eocene Zone E16 to lower Oligocene Zone O1, pending further investigations. “Questionable specimens illustrated by Raju (1971) are from the G. mexicana zone of India, here equivalent to Zone E14, hence likely from a lower stratigraphic level than we have been able to confirm, and he records the highest occurrence in G. sastrii zone, equivalent to Zone O1. We did not find this species in any middle Eocene cores from Tanzania. Blow (1979) illustrated a specimen from the middle Eocene of Tanzania (Zone P11 = Zone E9) that is quite convincingly S. tecta, but we have studied the type locality in many outcrop and borehole samples and never found this morphology, so we suspect contamination with an upper Eocene sample” (Pearson and Wade, 2015:15). [Wade et al. 2018]
Last occurrence (top): within O1 zone (32.10-33.90Ma, top in Rupelian stage). Data source: Pearson & Wade 2015
First occurrence (base): within E15 zone (34.68-35.89Ma, base in Priabonian stage). Data source: Pearson & Wade 2015

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.10 p.324;


Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

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

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

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

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

Raju, D. S. N. (1971). Upper Eocene to Early Miocene planktonic foraminifera from the subsurface sediments in Cauvery Basin, India. Jahrbuch der Geologischen Bundesanstalt, Sonderband. 17: 7-68. gs

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., 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

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


Subbotina tecta compiled by the pforams@mikrotax project team viewed: 24-2-2024

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