Catalog - Globigerinoides sicanus

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Globigerinoides sicanus

Citation: Globigerinoides sicanus de Stefani 1952

Type locality: Holotype (specimen of pl. 13, fig. 6 of Cushman and Stainforth, 1945) from sample Rz.108, Trinidad Leaseholds Catalogue No. 21743, Trinidad Government Cadastral coordinates N 229,450 links, E 354,250 links, situated on the "Cipero nose," along the coast between the mouth of the Cipero River and the point at which the Trinidad Government railway turns inland, south of San Fernando, Trinidad, W. I.

Type age (chronostrat): Holotype (specimen of pl. 13, fig. 6 of Cushman and Stainforth, 1945) from the Cipero Mari Formation, Zone Il [Globigerinatella insueta Zone] (fide Blow, 1969, op. cit., expl. pl. 3.) De Stefani's material frorn the Miocene, not younger than Tortonian; in a clay.

Type repository: Washington; USNM

Original Description
La specie descritta come nuova e abbastanza simile all 'esemplare figurato da Cushman J. A. e Stainforth R. M. (1945, pl. 13, fig. 6) e determinate come Globigerinoides conglobata (Brady) ; che non e pero questa specie.

Siccome Cushman e Stainforth ammettono il dubbio che la forma da loro descritta possa rappresentare il tipo ancestrale della vera Globigerinoides conglobata (H. B. Brady), il fatto che adesso esemplari quasi del tutto identici vengono ad essere riscontrati in Sicilia, oltre che a Trinidad, mi pare stia a rappresentare una costanza di caretteri, che puo autorizzare ad istituire una nuova specie.

Per essere breve, evito per il momento di darne una descrizione e rimando alla citata figura di Cushman e Stainforth." [Cushman and Stainforth, op. cit., p. 68]:
Specimens from Zones II and III are either young specimens or a primitive form of this species [i. e., Globigerinoides conglobata (Brady)]. A few of the specimens show the supplementary apertures on the dorsal side. From the series of specimens it is suggested that this form may represent the ancestral stages of Candorbulina. A few of the specimens have suggestions of small circular pores along the final suture similar to those found in Candorbulina. They also suggest a relationship to Globigerina mexicana Cushman.

Extra details from original publication

Globigerinoides conglobata (Brady). Cushman & Stainforth, 1945, Cushman Lab. Foram. Res.. Spec. Pubi., no. 14, p. 68, pl. 13, fig. 6.

Editors' Notes
Name has subsequently been corrected to Globigerinoides sicana de Stefani 1952, since the genus is feminine. de Stefani did not illustrate this species but instead cited an illusttrain of Cushman & Stainforth (1945) the speciemen in that image was sbseqquently reillustrated by Blow 1969.

References:

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

Cushman, J. A. & Stainforth, R. M. (1945). The foraminifera of the Cipero Marl Formation of Trinidad, British West Indies. Cushman Laboratory for Foraminiferal Research, Special Publication. 14: 1-75. gs

de Stefani, T. (1952). Su alcune manifestazioni di idrocarburi in provincia di Palermo e descrizione di Foraminiferi nuovi. Plinia. 3(4): 1-12. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides sicanus de Stefani 1952

Globigerinoides sicanus

References:

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