Dentoglobigerina pseudovenezuelana


Classification: pf_cenozoic -> Globigerinidae -> Dentoglobigerina -> Dentoglobigerina pseudovenezuelana
Sister taxa: D. juxtabinaiensis, D. binaiensis, D. sellii, D. tapuriensis, D. baroemoenensis, D. larmeui, D. galavisi, D. altispira, D. globosa, D. globularis, D. prasaepis, D. pseudovenezuelana, D. taci, D. tripartita, D. eotripartita, D. venezuelana, D. sp.,

Taxonomy

Citation: Dentoglobigerina pseudovenezuelana (Banner and Blow 1962)
Rank: Species
Basionym: Globigerina yeguaensis pseudovenezuelana
Synonyms:
Taxonomic discussion:

Blow and Banner (1962) argued that specimens illustrated by Bolli (1957) as venezuelana belonged to two distinct species, and named pseudovenezuelana to accommodate one of them, selecting a holotype from Tanzania. This relatively uncommon species was discussed and figured by Olsson and others (2006) and Pearson and Wade (2015). [Wade et al. 2018]

Catalog entries: Globigerina yeguaensis pseudovenezuelana;

Type images:

Distinguishing features: 3-3½ globular slightly compressed chambers in final whorl.
Umbilicus narrow triangular, with irregular pustulose 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.

Description


Diagnostic characters:

Dentoglobigerina pseudovenezuelana is distinguished from its ancestor D. galavisi by its more inflated chambers and in typically having 3½ rather than 3 chambers in the final whorl. Although it is called pseudovenezuelana, the resemblance is not especially close. Dentoglobigerina venezuelana tends to have a more spherical overall morphology, with large, appressed, pillow-like chambers, the last of which is very commonly reduced in size, and in generally lacking the very pustulose, ragged lip which is characteristic of pseudovenezuelana. In overall form, D. pseudovenezuelana is similar to D. prasaepis but tends to be much more pustulose around the umbilicus and tooth. [Wade et al. 2018]


Wall type: Cancellate, normal perforate, probably spinose in life, pustulose in umbilical region. [Wade et al. 2018]

Test morphology: Test large, trochospiral, compact, globular, subcircular in outline, chambers ovoid; in spiral view 3½ ovoid chambers in ultimate whorl, increasing moderately in size, sutures moderately depressed, straight; in umbilical view 3-3½ ovoid chambers increasing moderately in size, sutures deeply depressed, straight, umbilicus moderate in size, aperture centered over the umbilicus, bordered by an irregular pustulose lip or tooth; in edge view chambers ovoid in shape, embracing, ultimate chamber extends over the umbilicus, oval to subcircular in outline (modified from Olsson and others, 2006). [Wade et al. 2018]

Size: Maximum diameter of holotype 0.51 mm, thickness 0.34 mm. [Wade et al. 2018]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
umb chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Thin flange
sp chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
umbilical or test sutures:Strongly depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Strongly depressedfinal-whorl chambers:3.0-3.5

Biogeography and Palaeobiology


Geographic distribution: Known only from a few low latitude locations. [Wade et al. 2018]

Isotope paleobiology: Stable isotope data suggest calcification in a deep (thermocline) habitat (Poore and Matthews, 1984; Pearson and others, 2001; Wade and Pearson, 2008). Stable isotope data is supported by Mg/Ca thermometry (Wade and others, 2012). [Wade et al. 2018]

Phylogenetic relations: Dentoglobigerina pseudovenezuelana evolved from D. galavisi in the middle/late Eocene (Olsson and others, 2006). It is not considered the ancestor of venezuelana. [Wade et al. 2018]

Most likely ancestor: Dentoglobigerina galavisi - at confidence level 4 (out of 5). Data source: Olsson et al 2006, f13.1; Wade et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: According to Blow (1979), this species first appeared in Zone P13 (= E12) and persisted to Zone P19/20 (= upper Zone O1-O2). The highest occurrence recorded by us is from the lowermost part of Zone O2 of IODP Site U1334 (B.S. Wade, unpublished observation). [Wade et al. 2018]
Last occurrence (top): within O2 zone (30.28-32.10Ma, top in Rupelian stage). Data source: Wade et al. 2018 11.1
First occurrence (base): within E14 zone (35.89-37.99Ma, base in Bartonian stage). Data source: Olsson et al 2006

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.11 p.358; Olsson et al. 2006 - Eocene Atlas, chap. 13, p. 404

References:

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), 2. 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), Plankton Stratigraphy. Cambridge University Press, Cambridge, UK, pp. 155-262.

Bolli, H.M., (1957). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, DC, pp. 97-123.

Fleisher, R.L., (1974). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project, 23: 1001-1072.

Hedberg, H.D., (1937). Foraminifera of the middle Tertiary Carapita Formation of northeastern Venezuela. Journal of Paleontology, 11: 661-697.

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. In: Berger, W.H., Kroenke, L.W. and al., e. (Editors), Proceedings of the Ocean Drilling Program, Scientific Results. Ocean Drilling Program, College Station, Texas, pp. 113-136.

Li, Q.; McGowran, B. & James, N.P., (2003). Eocene–Oligocene planktonic forminiferal biostratigraphy of Sites 1126, 1130, 1132, and 1134, ODP Leg 182, Great Australian Bight. Proceedings of the Ocean Drilling Program, Scientific Results, 182: 1-28.

Olsson, R.K.; Hemleben, C. & Pearson, P.N., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Dentoglobigerina. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera. Cushman Foundation Special Publication. 41 Allen Press, Lawrence, Kansas, pp. 401-412.

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

Pearson, P.N. & others, (2001). Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs. Nature, 413: 481-487.

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.

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.

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.

Wade, B.S.; Premec-Fucek, V.; Kamikuri, S.; Bartol, M.; Luciani, V. & Pearson, P.N., (2012). Successive extinctions of muricate planktonic foraminifera (Morozovelloides and Acarinina) mark the base Priabonian. Newsletters on Stratigraphy, 45: 245-262.

Wade, B.S.; Pearson, P.N.; Olsson, R.K.; Fraass, A.J.; Leckie, R.M. & Hemleben, C., (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Dentoglobigerina and Globoquadrina. In: Wade, B.S. et al. (Editors), Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research Special Pulbication. 46, pp. 331-385.


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Dentoglobigerina pseudovenezuelana compiled by the pforams@mikrotax project team viewed: 16-11-2018

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