Globoquadrina dehiscens

Classification: pf_neogene -> hidden -> deleted -> Globoquadrina dehiscens
Sister taxa: Globoquadrina dehiscens, Paragloborotalia kugleri, d. sp.,


Citation: Globoquadrina dehiscens (Chapman, Parr & Collins, 1934)
Basionym: Globorotalia dehiscens Chapman, Parr & Collins, 1934

Catalog entries: Globorotalia dehiscens;

Type images:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.


Diagnostic characters: Umbilico-convex, very low trochospiral

Aperture: : Interiomarginal umbilical low arch covered with umbilical tooth [Aze 2011, based on Kennett & Srinivasan 1983]

Wall type: Non-spinose; Coarsely cancellate [Aze 2011]

Test morphology: Test low trochospiral, spiral side almost flat, umbilical side strongly convex; equatorial periphery subquadrate; chambers 3 ½ to 4 in the final whorl, strongly compressed laterally with subrounded to angular shoulder, final chamber with steep umbilical face; sutures on both spiral and umbilical sides radial to slightly curved and depressed; surface distinctly cancellate with large, circular pores and polygonal ridges (Pl. 44, Fig. 2); umbilicus large, deep; aperture low, interiomarginal, umbilical, covered with umbilical tooth. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology

Geographic distribution: Tropical to temperate. [Kennett & Srinivasan 1983]

Isotope paleobiology: Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light ∂13C and relatively heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Pearson & Shackleton (1995); Keller (1985)

Biostratigraphic distribution

Geological Range:
Notes: The evolutionary first appearance of Gq. dehiscens at 22.2 Ma marks the base of Zone N4B (Srinivasan and Kennett, 1981b) in warm waters and also the Globoquadrina dehiscens Zone of Jenkins in temperate waters (1971). Since the first appearance of Gq. dehiscens is close to the Oligocene-Miocene boundary, it is useful in approximating this boundary in oceanic sequences (Srinivasan and Kennett, 1981a, 1981b, 1983). Although Gq. dehiscens has been found in some Pliocene sediments (Bizon and Bizon, 1972; Jenkins and Orr, 1972; Kennett and Srinivasan, 1975), its last appearance is widely accepted as marking the Miocene-Pliocene boundary in most areas (Berggren, 1973). [Kennett & Srinivasan 1983]
Last occurrence (top): in mid part of M14 [Atl.] zone (54% up, 5.9Ma, in Messinian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).
First occurrence (base): at base of M1b subzone (0% up, 22.4Ma, in Aquitanian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.184


Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

Bizon, G. & Bizon, J.-J., (1972). Atlas des Pricipaux Foraminiferes Planctoniques du Bassin Mediterraneen Oligocene a Quaternaire. Technip, France.

Chapman, F.; Parr, W.J. & Collins, A.C., (1934). Tertiary foraminifera of Victoria, Australia - The Balcombian deposits of Port Phillip. part III. Linnean Society's Journal, Zoology, 38(262): 553-577.

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.

Keller, G., (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In: Kennett, J.P. (Editor), The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir The Geological Society of America, Boulder, Colorado, pp. 1-337.

Kennett, J.P. & Srinivasan, M.S., (1975). Stratigraphic occurrences of the Miocene planktonic foraminifer Globoquadrina dehiscens in Early Pliocene sediments of the Indian Ocean. Revista Española de Micropaleontolgía, 7(1): 5-14.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Pearson, P.N. & Shackleton, N.J., (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results, 144. Ocean Drilling Program, College Station, TX, 401-410 pp.

Srinivasan, M.S. & Kennett, J.P., (1981). A review of Neogene planktonic foraminiferal biostratigraphy: applications in the equatorial and south Pacific. SEPM Special Publication: 395-432.

Srinivasan, M.S. & Kennett, J.P., (1981). Neogene planktonic foraminiferal biostratigraphy and evolution: equatorial to subantarctic, south Pacific. Marine Micropaleontology, 6: 499-533.

Srinivasan, M.S. & Kennett, J.P., (1983). The Oligocene-Miocene boundary in the South Pacific. Geological Society of America Bulletin, 94: 798-812.


Globoquadrina dehiscens compiled by the pforams@mikrotax project team viewed: 20-1-2018

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