CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia tortiva Bolli 1957

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 -> Globorotalia -> Globorotalia tortiva
Other pages this level: << < G. scitula subscitula, G. scitula ventriosa, G. seigliei, G. sibaiyaensis, G. sinuososuturalis, G. spinulosa, G. strabocella, G. sturanii, G. subbotinae, G. subconica, G. suterae, G. tadjikistanensis, G. testarugosa, G. tetracamerata, G. thebaica, G. tortiva, G. tosaensis, G. traubi, G. tribulosa, G. trichotrocha, G. trinidadensis, G. troelseni, G. truncatulinoides excelsa, G. uncinata, G. uncinata carinata, G. ungulata, G. velascoensis parva, G. wartsteinensis, G. whitei, G. wilcoxensis, G. wilcoxensis acuta> >>

Globorotalia tortiva

Citation: Globorotalia tortiva Bolli 1957
Rank: species
Type locality: Hypotype (USNM P5066) from Trinidad Leaseholds, Ltd., well Guayaguayare 159, Trinidad (coordinates N:151361 links; E:554095 linlis), sample from core 4,434-46 feet (TLL 233005).
Type age (chronostrat): Lower part of Globorotalia pseudomenardii zone.
Type sample (& lithostrat): Lizard Springs formation.
Type specimens: Hypotype (USNM P5066); Plate 19, Figures 19-21
Type repository: Washington; USNM

Linked specimens: USNM-5066

Current identification/main database link: Subbotina velascoensis (Cushman 1925)

See also: Globorotalia (Turborotalia) hansbollii ;Globigerina velascoensis compressa ;


Original Description
Shape of test very low trochospiral, spiral side almost flat, umbilical side strongly convex; equatorial periphery lobate, chambers give a quadrangular to pentagonal outline; axial periphery rounded to subangular. Wall calcareous,perforate, surface finely spinose. Chambers laterally strongly compressed; 10-12, arranged in 2-2½ whorls, the 4-4½ chambers of the last whorl increasing rapidly in size. Sutures on spiral side curved in early chambers, often straight, oblique between penultimate and ultimate chambers, depressed; on umbilical side radial or slightly curved, depressed. Umbilicus narrow, open. Aperture a high arch; interiomarginal, Largest diameter of holotype 0.24 mm. extraumbilical-umbilical. Coiling 85% dextral

Size: Largest diameter of holotype 0.33 mm.

Extra details from original publication
Synyonym:
Remarks: White (1928) described an identical form from Mexico under the name Globigerina velascoensis var. compressa. The interiomarginal, extraumbilical-umbilical position of the aperture places it within the genus Globorotalia where it becomes a homonym of G. compressa (Plummer). For this reason the new name G. tortiva is proposed. G. tortiva possibly branched off from Globigerina velascoensis which has less compressed chambers and an umbilical position of the apertures.

Editors' Notes
Since this is a new name the holotype remains that of White 1928.
Loeblich & Tappan (1957) considered the speciemen of White (& thus the holotype of tortiva) to be different to the concept and illustratration of Bolli 1957.
Blow & Banner (1962) described another species G. (Turborotalia) hansbolli based on the species decription given by Bolli for G. tortiva.

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

Bolli, H. M. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 61-82. gs V O

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 173-198. gs V O

White, M. P. (1928). Some Index Foraminifera of the Tampico Embayment Area of Mexico. Journal of Paleontology. 2(3): 177-215. gs


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Globorotalia tortiva compiled by the pforams@mikrotax project team viewed: 2-3-2021

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