CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia (Turborotalia) praeoscitans Akers 1972

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 (Turborotalia) -> Globorotalia (Turborotalia) praeoscitans
Other pages this level: << < G. (Turborotalia) hansbollii, G. (Turborotalia) humerosa praehumerosa, G. (Turborotalia) incisa, G. (Turborotalia) longiapertura, G. (Turborotalia) mendacis, G. (Turborotalia) nkbrowni, G. (Turborotalia) oceanica, G. (Turborotalia) palpebra, G. (Turborotalia) parkerae, G. (Turborotalia) peripheroacuta, G. (Turborotalia) peripheroronda, G. (Turborotalia) permicra, G. (Turborotalia) planispira, G. (Turborotalia) pliocenica, G. (Turborotalia) praecentralis, G. (Turborotalia) praeoscitans, G. (Turborotalia) pseudoimitata, G. (Turborotalia) pseudoinconstans, G. (Turborotalia) pseudokugleri, G. (Turborotalia) pseudopumilio, G. (Turborotalia) quadrilocula, G. (Turborotalia) rainwateri, G. (Turborotalia) riedeli, G. (Turborotalia) rikuchuensis, G. (Turborotalia) tosaensis tenuitheca, G. (Turborotalia) transsylvanica, G. (Turborotalia) variospira,

Globorotalia (Turborotalia) praeoscitans

Citation: Globorotalia (Turborotalia) praeoscitans Akers 1972
Rank: species
Type locality: Holotype: Yorktown Formation at Rice's Pit (TU 613); Paratypes: (I)Jackson Bluff Formation at Darling Slide (TU 712); (2)Jackson Bluff Formation at Jackson Bluff,Bed 9;Yorktown Formation at Rice's Pit (TU 613).
Holotype Repository: USNM: Smithsonian, Washington DC, USA
Type & figured specimens: Holotype: USNM 180583; Paratypes: USNM 180584; USNM 180585;USNM 180586.

Linked specimens: USNM-180584 USNM-180586 USNM-180585 USNM-180583

Current identification/main database link:

Original Description
Test moderately large, planoconvex, sinistrally coiled with 10 to 13 chambers comprising the spire and four to five chambers in the final whorl. The equatorial profile is slightly lobulate. In axial profile, the test appears cuneiform because of the abrupt inflation, both lateral and vertical, of the final chamber in contrast with the periphery of the antepenultimate chamber. Sutures are distinct and
slightly recurved. The wall is finely perforate with a foraminal density which is consistent for all specimens seen. Pustules may occur on both sides of the test, but in some specimens they may be confined to the central region of the umbilical side. The aperture is a large interiomarginal, umbilical-extraumbilical,semi-circular opening with a narrow lip, which is smooth in some specimens but pustulate in others.

Size: Holotype: maximum diameter 0.47 mm.

Extra details from original publication
Discussion: Globorotalia (T.) praeoscitans,new species, Globorotalia (T.) oscitans Todd,Globorotalia (T.) bononiensis Dondi, and Globorotalia (T.) inflata (d'Orbigny) appear to be an interrelated complex characterized by abrupt and extreme cameral inflation and a very large, arcuate to semicircular aperture which, except in Globorotalia (T.) inflata, is demarcated by a narrow lip. Globorotalia (T.) praeoscitans is almost twice the diameter of Globorotalia (T.) oscitans, has a larger aperture, and is more cuneiform in axial profile.
Globorotalia (T.) bononiensis is approximately the same size as Globorotalia (T.) praeoscitans, and it also has a large aperture, but Dondi's species appears to be biconvex, and the cameral inflation is more gradual. This is also true of Globorotalia (T.) inflata, which has the most globose chambers of the complex.
Globorotalia (T.) praeoscitans has been seen also at the Darling Slide locality, Jackson Bluff, Bed 9 Jackson Bluff Formation,Ecphora Faunizone), and in the Yorktown Formation at Wilson's Pit (TU 613 ). These beds are considered to be lowermost Pliocene to lower middle Pliocene (later part of Zone N. 18 to the later part of Zone N. 19 ).
Globorotalia (T.) praeoscitans is abundant in Yorktown beds at the Texas Gulf Sulphur Company mine near Aurora, North Carolina (TU 1022). This species and Globigerina bulloides are the predominant components of the planktonic assemblage.


Akers, W. H. (1972). Planktonic foraminifera and biostratigraphy of some Neogene formations, northern Florida and Atlantic coastal plain. Tulane Studies in Geology and Paleontology. 9: 1-139. gs V O


Globorotalia (Turborotalia) praeoscitans compiled by the pforams@mikrotax project team viewed: 26-9-2020

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