Catalog - Globigerina ouachitaensis gnaucki Catalog - Globigerina ouachitaensis gnaucki

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina ouachitaensis gnaucki Blow & Banner 1962

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globigerina -> Globigerina ouachitaensis gnaucki
Other pages this level: << < G. multiloba, G. neofalconensis, G. nepenthes, G. nepenthes delicatula, G. nepenthoides, G. nilotica, G. nipponica, G. nitida, G. nodosa, G. occlusa, G. officinalis, G. officinalis crux, G. oligocaenica, G. orbiformis, G. ouachitaensis, G. ouachitaensis gnaucki, G. ouachitaensis senilis, G. ovoidea, G. oxfordiana, G. panormensis, G. parabulloides, G. paradubia, G. paraobesa, G. paratriloculinoides, G. paravenezuelana, G. parisiensis, G. partidiana, G. parva, G. patagonica, G. pauciloculata, G. pera> >>

Globigerina ouachitaensis gnaucki

Citation: Globigerina ouachitaensis gnaucki Blow & Banner 1962
taxonomic rank: sub-species
Type specimens: Plate IX L-N; P44509
Type sample (& lithostrat): sample FCRMI965,
Type age (chronostrat): Upper Eocene, or Oligocene
Type locality: Lindi area, Tanzania
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (PM PF 44509) London, UK; NHM (PM P 44509)

Current identification/main database link: Globoturborotalita gnaucki (Blow & Banner 1962)


Original Description

The fairly small test consists of about three whorls of subglobular to slightly ovoid, inflated chambers arranged four to four and a half in each whorl in a moderately high trochospire. The rate of enlargement of the chambers increases during ontogeny; in dorsal aspect the early chambers are of semi-circular outline, being distinctly longer circumferentially than they are broad radially, but in the last whorl the chambers broaden more rapidly than they lengthen and become slightly ovoid in axial profile. The sutures are distinctly and broadly depressed; the dorsal intercameral sutures are initially curved but become nearly radial. The spiral suture and the equatorial periphery are strongly lobulate. The axial periphery is broadly rounded. The umbilicus is fairly broad, open and deep and even in four-chambered forms loses the square outline typical of Globigerina ouachitaensis ouachitaensis. The apertural face is less flattened than in G. ouachitaensis ouachitaensis and consequently the umbilicus is less clearly delimited from the rest of the ventral surface. The intraumbilical aperture is a fairly low arch, highest at its anterior end, bordered by a distinct rim. Relict apertures of the last two or three chambers are visible within the umbilicus. The wall is fairly thin, uniformly and finely perforate; its surface is cancellate and hispid. The hispidity is strongest on the earlier parts of the test, being reduced on the last chamber where the apertural face is smooth.

Size:
Maximum diameter of holotype: 0·36 nm1;

Etymology:
This subspecies is named for F. R. Gnauck, Palynologist, The British Petroleum Co. Ltd, in recognition of his help with the photographs (Plates XVI and XVII).

Extra details from original publication
Remarks; This form differs from Globigerina ouachitaensis ouachitaensis in its loss of a quadrate umbilicus and symmetrical aperture, and in its acquisition of a changed growth rate and a distinctly more hispid test. It differs from G. ouachitaensis ciperoensis in having a higher-spired test with fewer chambers per whorl, a more strongly developed apertural rim, more rapidly enlarging chambers and a more hispid test. It differs from G. praebulloides praebulloides in having more, less rapidly enlarging chambers per whorl, a smaller aperture, and a more hispid test.

Stratigraphical range: Globigerina ouachitaensis gnaucki ranges from the G. turritilina turritilina Zone, Upper Eocene, to the G. oligocaenica Zone, Oligocene, in the Lindi area. It has not been seen in any Aquitanian sediments either in Europe or the Caribbean region.

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

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

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018d). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. 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 8): 231-268. gs

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Globigerina ouachitaensis gnaucki compiled by the pforams@mikrotax project team viewed: 14-12-2024

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