pforams@mikrotax - Dentoglobigerina tapuriensis

Citation: Dentoglobigerina tapuriensis (Blow & Banner 1962)

Basionym: Globigerina tripartita tapuriensis Blow & Banner 1962

Synonyms:

Globigerina tripartita tapuriensis Blow and Banner, 1962:97-98, pl. 10, figs. H-K [lower Oligocene G. oligocaenica Zone, Lindi area, Tanzania].
Globigerina tapuriensis Blow and Banner.—Blow 1969:322, pl. 16, figs. 7, 8 [lower Oligocene Zone P19, Lindi area, Tanzania].—Jenkins and Orr, 1972:1090, pl. 11, figs. 7-9 [lower Oligocene P. barbadoensis Zone, DSDP Hole 77B, eastern equatorial Pacific Ocean].—Blow, 1979:859-861, pl. 16, figs. 7, 8 (reproduced from Blow, 1969, pl. 16, figs. 7, 8), pl. 245, fig. 9 [lower Oligocene Zone P18, DSDP Site 14, central South Atlantic Ocean], pl. 247, fig. 2 [lower Oligocene Zone P19/20, DSDP Site 14, central South Atlantic Ocean].—Leckie and others, 1993:124, pl. 5, fig. 11 [lower Oligocene Zone P18, ODP Hole 803D, Ontong Java Plateau, western equatorial Pacific Ocean], pl. 5, fig. 12 [lower Oligocene Zone P20, ODP Hole 803D, Ontong Java Plateau, western equatorial Pacific Ocean], pl. 5, figs. 13, 15 [lower Oligocene Zone P19, ODP Hole 628A, Little Bahama Bank, western North Atlantic Ocean], pl. 5, fig. 14 [upper Oligocene Zone P22, ODP Hole 628A, Little Bahama Bank, western North Atlantic Ocean], pl. 5, fig. 16 [lower Oligocene Zone P18, ODP Hole 628A, Little Bahama Bank, western North Atlantic Ocean].
Globoquadrina tripartita tapuriensis (Blow and Banner).—Fleisher, 1974:1025, pl. 10, fig. 4 [lower Oligocene Zone P18/P19, DSDP Site 219, Arabian Sea].
“Globoquadrina” tapuriensis (Blow and Banner).—Spezzaferri and Premoli Silva, 1991:248, pl. 9, figs. 3a-c [lower Oligocene Subzone P21a, DSDP Hole 538A, Gulf of Mexico].
Dentoglobigerina tapuriensis (Blow and Banner).—Pearson and Wade, 2015:19, figs. 20.1a-d (SEMs of the holotype of Globigerina tripartita tapuriensis Blow and Banner), fig. 20.2 [lower Oligocene Zone O1, TDP Site 12, Stakishari, Tanzania], figs. 20.3, 20.5, 20.6, 20.8, 20.9 [lower Oligocene Zone O1, TDP Site 17, Stakishari, Tanzania], figs. 20.4a-b [upper Eocene Zone E15/16, TDP Site 12, Stakishari, Tanzania], fig. 20.7 [upper Eocene Zone E15/16, TDP Site 17, Stakishari, Tanzania].
Globoquadrina tripartita Koch.—Spezzaferri and Premoli Silva, 1991:248, pl. 3, figs. 2a-c.—Spezzaferri, 1994:42, pl. 42, figs. 2a-c (reproduced from Spezzaferri and Premoli Silva, 1991:248, pl. 3, fig. 2a-c). [Not Koch, 1926.]
Not Globoquadrina tapuriensis (Blow and Banner).—Li and others, 2005:19, pl. 2, fig. 7 (= Dentoglobigerina tripartita).

Taxonomic discussion:

This species was described by Blow and Banner (1962) from Tanzania. The holotype was illustrated in SEM by Pearson and Wade (2015) for the first time, along with a range of comparable specimens from drill sites in Tanzania. The species is generally quite rare, but has been reliably recorded from the lower Oligocene from all the major ocean basins. [Wade et al. 2018]

Distinguishing features: 3 compressed chambers in final whorl.
Umbilicus elliptical, deep; with thin lip.

Description

Diagnostic characters:

Dentoglobigerina tapuriensis is distinguished from its ancestor, D. taci, by its broader, more radially compressed final chamber, and by generally having fewer chambers in the final whorl and a narrower apertural lip. Like D. taci, it seems never to have an umbilical tooth. It is distinguished from its probable descendant, D. sellii, by having more lobate outline and less flattened umbilical face. [Wade et al. 2018]

Wall type: Cancellate and probably spinose in life. [Wade et al. 2018]

Test morphology: Test large, chambers globular, arranged in a moderate trochospiral, outline oval, chambers moderately to strongly radially compressed; in spiral view 3, occasionally up to 3½ appressed and embracing chambers in final whorl, increasing rapidly in size, sutures straight to slightly curved, weakly depressed; in umbilical view 3, occasionally up to 3½ globular and appressed chambers in final whorl, increasing rapidly in size, sutures incised, straight or slightly curved, umbilicus wide, oval, and deep; aperture umbilical, a wide arch, centrally placed usually with a thin lip of constant thickness; in edge view chambers globular in shape, embracing, the final chamber leaning over the umbilicus. [Wade et al. 2018]

Size: Maximum of holotype 0.73 mm. [Wade et al. 2018]

Biogeography and Palaeobiology

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

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

Phylogenetic relations: Blow (1969) suggested an evolutionary lineage from tripartita – tapuriensis – sellii – binaiensis. While we agree with the tapuriensis – sellii – binaiensis evolutionary line, we now regard D. galavisi as the more likely ancestral form evolving through the intermediate D. taci. [Wade et al. 2018]

Biostratigraphic distribution

Geological Range:
Notes: This species ranges through the entire Oligocene. Most authors have regarded it as originating in the basal Oligocene, but Wade and Pearson (2008) and Pearson and Wade (2015) recorded its lowest occurrence in the uppermost Eocene (Zone E15/E16). Spezzaferri and Premoli Silva (1991) recorded its highest occurrence in Subzone P21b. However, one of the specimens illustrated by Leckie and others (1993), on their pl. 5, fig. 14, is from upper Oligocene Zone P22, and we have observed and here illustrate specimens from Zone O7 of the western North Atlantic Ocean. [Wade et al. 2018]
Last occurrence (top): within O7 zone (22.96-25.21Ma, top in Aquitanian stage). Data source: Wade et al. 2018
First occurrence (base): within E16 zone (33.90-34.68Ma, base in Priabonian stage). Data source: Wade et al. 2018

References:

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. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. 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

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

Jenkins, D. G. & Orr, W. N. (1972). Planktonic foraminiferal biostratigraphy of the east equatorial Pacific--DSDP Leg 9. Initial Reports of the Deep Sea Drilling Project. 9: 1059-1193. gs V O

Koch, R. (1926). Mitteltertiare Foraminiferen aus Bulongan, Ost-Borneo. Eclogae Geologicae Helvetiae. 19(3): 722-751. gs V O

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

Li, Q., Jian, Z. & Su, X. (2005). Late Oligocene rapid transformations in the South China Sea. Marine Micropaleontology. 54: 5-25. 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 V O

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. gs

Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica. 81: 1-187. 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., Pearson, P. N., Olsson, R. K., Fraass, A. J., Leckie, R. M. & Hemleben, C. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Dentoglobigerina and Globoquadrina. 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 11): 331-384. gs V O

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Moderate	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	0.0-0.0	N.B. These characters are used for advanced search. N/A - not applicable

Dentoglobigerina tapuriensis

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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