Catalog - Globigerina turritilina praeturritilina Catalog - Globigerina turritilina praeturritilina

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina turritilina praeturritilina 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 turritilina praeturritilina
Other pages this level: << < G. topilensis, G. triangularis, G. tricamerata, G. trigonula, G. triloba, G. trilocularis, G. triloculinoides, G. triloculinoides nanus, G. triloculinoides parva, G. tripartita tapuriensis, G. trivialis, G. tschikryzovi, G. tumbili, G. turbulenta, G. turcmenica, G. turritilina praeturritilina, G. turritilina turritilina, G. tuschepsensis, G. umbilicata, G. umbrica, G. uruchaensis, G. utilisindex, G. varianta, G. velascoensis, G. velascoensis compressa, G. venezuelana, G. vignalii, G. voluta, G. wagneri, G. washitensis, G. weissi> >>

Globigerina turritilina praeturritilina

Citation: Globigerina turritilina praeturritilina Blow & Banner 1962
taxonomic rank: sub-species
Type specimens: Plate XIII D-G
Type sample (& lithostrat): sample FCRM 1645
Type locality: Lindi area, Tanzanai
Type repository: null

Linked specimens: London, UK; NHM (PM P 44535)

Current identification/main database link: Subbotina gortanii (Borsetti 1959)


Original Description

This subspecies is similar to Globigerina turritihina turritilina but differs in possessing more depressed (slightly less inflated) chambers, a much broader umbilicus, a higher final aperture and a slightly less coarsely perforate wall. The height of the aperture is not always much greater in relation to the shape of the chamber but always clearly opens more to the exterior, less directly into the umbilicus, than in G. turritilina turritilina. The apertural face of G. turritilina praeturritilina is narrowly but distinctly flattened.

Size:
Maximum diameter of holotype 0.48mm

Extra details from original publication
Remarks: In Globigerina turritilina praeturritilina the umbilicus may be so open and deep that the relict apertures of almost all the earlier chambers of the last and preceding whorls may be observed within it. Frequently, the primary aperture is a high, semicircular arch, much higher than in the holotype; this seems to occur where the umbilicus is less open, and the combination of these two characters serves as a ready distinction from G. turritilina turritilina. Aborted end-chambers often occur in the larger individuals; they are reduced in size and are of irregular shape, but usually retain their position within the normal progression of the spire and do not usually tend to cover the umbilicus as in G. turritilina turritilina. The maximum size attained by individuals of G. turritilina praeturritilina seems to be less than that attained in populations of G. turritilina turritilina.

Stratigraphical range
: In East Africa, this subspecies ranges from the Globigerapsis semi-involuta Zone to the lower part of the Globigerina turritilina turritilina Zone, Upper Eocene, where it evolves into, and is replaced by, G. turritilina turritilina. Although it has not been recorded from other localities, similar forms have been observed by us in the Upper Eocene of southern Trinidad.

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

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


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Globigerina turritilina praeturritilina compiled by the pforams@mikrotax project team viewed: 27-5-2024

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