CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia praemenardii Cushman & Stainforth 1945
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.
Citation: Globorotalia praemenardii Cushman & Stainforth 1945taxonomic rank: speciesType specimens: pl. 13, fig. 14, X 55. Fig. 14: no. 43978.Type age (chronostrat): Probably Upper Oligocene, Cipero formation, Zone III (Globorotalia fohsi zone), light-colored marls. Type locality: Sample Rz.425, Trinidad Leaseholds Catalogue No. 61418, Trinidad Government Cadastral co-ordinates: N 228,300 links, E 353,600 links, situated at the base of the cliff in the southern (N-dipping) limb of the syncline, 120 feet northeastward from the boundary between the upper and middle zones, 88o feet in a straight line southwestward from Rz.1o8 ("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, B.W.I. Type repository: Washington, USNM
Original Description "Test trochoid, dorsal side slightly convex, especially in the early portion, flattened toward the periphery, ventral side more strongly convex, periphery with a very slightly developed, narrow keel; chambers indistinct on the dorsal side of the early portion, except the last two or three, more inflated and distinct on the ventral side, about five in the final whorl; sutures indistinct on the dorsal side, curved, on the ventral side depressed and nearly radial; wall smooth, finely perforate; aperture a low, elongate opening on the ventral edge of the last-formed chamber. Length of holotype 0. 55 mm.; bread h 0.42 mm . ; thickness 0.28 mm . Size: Length of holotype 0. 55 mm.; bread h 0.42 mm . ; thickness 0.28 mm . Extra details from original publication "This species is evidently the ancestral form of G. menardii d 'Orbigny and differs in the smaller size, thicker test, less distinct chambers and sutures, and very slight development of a peripheral keel. It is possible that some of the Oligocene records for G. menardii may belong to this species. Typical G. menardii apparently appeared in the Mliocene."
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
Globorotalia praemenardii compiled by the pforams@mikrotax project teamviewed: 9-9-2024
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Blow 1969 pl06 f01-3.JPG_USNM43978_holo.jpg)
praemenardii(G)_USNM43978_holo.jpg
Blow 1969 pl06 f01-3.JPG_USNM43978_holo.jpg)
praemenardii(G)_USNM43978_holo.jpg
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