Dentoglobigerina prasaepis


Classification: pf_cenozoic -> Globigerinidae -> Dentoglobigerina -> Dentoglobigerina prasaepis
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 prasaepis Blow 1969
Rank: Species
Basionym: Globigerina prasaepis Blow 1969
Synonyms:
Taxonomic discussion:

According to Blow (1969) the species name refers to the “trough-like” aperture (Latin praesepe = trough), which according to Blow (1979:806) was unintentionally misspelled in the original description. Dentoglobigerina prasaepis has been a relatively under-utilized species. It is homeomorphic with both Globoturborotalita euapertura (Jenkins) and Turborotalia ampliapertura (Bolli). It was considered a junior synonym of euapertura by Jenkins and Orr (1972), Fleisher (1975) and Berggren and Miller (1988), whereas Blow and Banner (1962) and Blow (1969, 1979) thought it was closely related to ampliapertura. This species was discussed by Pearson and Wade (2015), who illustrated the holotype in SEM, showing that the wall texture is typical for Dentoglobigerina and hence prasaepis is unrelated to both euapertura and ampliapertura. It is close to D. venezuelana in general morphology, and was regarded as a likely ancestor of that species by Pearson and Wade (2015). Two of Blow’s paratypes are herein regarded as closer to venezuelana than prasaepis. [Wade et al. 2018]

Catalog entries: Globigerina prasaepis

Type images:

Distinguishing features: 3½ globular slightly compressed chambers in final whorl.
Umbilicus rectangular, broad, open; with thin lip.

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 prasaepis is distinguished from Globoturborotalita euapertura, with which it has frequently been confused, by its pustulose wall and more rounded chambers, and less incised sutures. This species is broadly homeomorphic with some specimens of Turborotalia ampliapertura, but is distinguished primarily by its wall texture, and by having a broader, lower arched aperture in most specimens. It is distinguished from D. venezuelana by its looser coiling, less embracing chambers, and large, open umbilicus and from D. taci by its more compressed chambers and rectangular (rather than square) umbilicus (see Pearson and Wade, 2015: Table 3).

[Wade et al. 2018]

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

Test morphology: Test large, medium trochospiral, globular, subcircular in outline, slightly lobate; in spiral view 3½ oval chambers in final whorl, increasing moderately rapidly in size, sutures depressed, straight; in umbilical view 3½-4 ovoid chambers increasing moderately in size, initially spherical but becoming more radially compressed as added, sutures deeply depressed, curved, umbilicus wide, aperture centered over the umbilicus, with a thin, even and smooth lip but no tooth; in edge view chambers ovoid in shape, embracing, ultimate chamber extends over the umbilicus, oval to subcircular in outline. [Wade et al. 2018]

Size: Maximum diameter of holotype 0.41 mm, thickness 0.34 mm. [Wade et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Moderateperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.5-3.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: So far this species has only been recorded from tropical / subtropical latitudes, worldwide. [Wade et al. 2018]

Isotope paleobiology: Relatively positive δ18O values suggest a thermocline dwelling habitat (Wade and Pearson, 2008; recorded as “Globoquadrinaeuapertura). [Wade et al. 2018]

Phylogenetic relations: We consider D. prasaepis to be morphologically transitional from D. taci to D. venezuelana (Pearson and Wade, 2015). [Wade et al. 2018]

Most likely ancestor: Dentoglobigerina taci - at confidence level 3 (out of 5). Data source: Wade et al. 2018.
Likely descendants: Dentoglobigerina venezuelana;

Biostratigraphic distribution

Geological Range:
Notes: The lowest confirmed occurrence is in lower Zone O1 (Fleisher, 1974; Pearson and Wade, 2015). Fleisher (1974) indicated a stratigraphic range confined to the lower Oligocene from Zone P18 to P21, and almost all confirmed occurrences are lower Oligocene. However, Blow (1979) suggested it extended as high as upper Oligocene Zone P22 (=Zone O6/O7) and Spezzaferri and Premoli Silva (1991) illustrated a specimen from that level. [Wade et al. 2018]
Last occurrence (top): within O4 zone (28.09-29.18Ma, top in Rupelian stage). Data source: Wade et al. 2018 f11.1 (with entire range extension to O7)
First occurrence (base): within O1 zone (32.10-33.90Ma, base in Priabonian stage). Data source: Pearson & Wade 2015 f2

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.11 p.357; Pearson & Wade 2015

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

Fleisher, R. (1975). Oligocene planktonic foraminiferal biostratigraphy, central North Pacific Ocean, DSDP Leg 32. Initial Reports of the Deep Sea Drilling Project. 32: 753-763. gs

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

Jenkins, D. G. (1960). Planktonic foraminifera from the Lakes Entrance oil shaft, Victoria, Australia. Micropaleontology. 6: 345-371. gs

Krasheninnikov, V. A. & Pflaumann, U. (1978). Cretaceous agglutinated foraminifera of the Atlantic Ocean off west Africa (Leg 41, Deep Sea Drilling Project). Initial Reports of the Deep Sea Drilling Project. 41: 565-580. gs

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

Poore, R. Z. (1984). Middle Eocene through Quaternary planktonic foraminifers from the southern Angola Basin: Deep Sea Drilling Project Leg 73,. Initial Reports of the Deep Sea Drilling Project. 73: 429-448. gs

Quilty, P. G. (1976). Planktonic foraminifera DSDP Leg 34, Nazca Plate. Initial Reports of the Deep Sea Drilling Project. 34: 629-703. gs

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


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Dentoglobigerina prasaepis compiled by the pforams@mikrotax project team viewed: 13-11-2019

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