Catalog - Globorotalia menardii miocenica Catalog - Globorotalia menardii miocenica

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia menardii var. miocenica Palmer 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.


Higher levels: pf_cat -> G -> Globorotalia -> Globorotalia menardii miocenica
Other pages this level: << < G. marginaculeata, G. marginodentata, G. marginodentata propelleriformis, G. mariae, G. mariae gratiae, G. mariae mariae, G. marksi, G. martinezi, G. mattseensis, G. mayeri, G. mayeri nympha, G. menardii antarctica, G. menardii fijiensis, G. menardii gibberula, G. menardii jamesbayensis, G. menardii miocenica, G. menardii miotumida, G. menardii multicamerata, G. menardii neoflexuosa, G. menardii panda, G. mineacea, G. minuta, G. minutissima, G. miocenica mediterranea, G. miotumida explicationis, G. miozea, G. miozea acumarginata, G. miozea conoidea, G. miozea rifensis, G. miozea sphericomiozea, G. miroensis> >>

Globorotalia menardii miocenica

Citation: Globorotalia menardii var. miocenica Palmer 1945
Taxonomic rank: variety
Type specimens: no. 20047
Type sample (& lithostrat): Bowden formation; grayish tan coarse sandstone in a marly matrix. Moderately common.
Type age (chronostrat): Miocene, Vindobonian, top of the middle Miocene or base of the upper Miocene
Type locality: K. V. Palmer Sta. 1, Port Morant, at foot of hill where road to old Capt. Baker house turns off main road to Dowden P. 0. and the United Fruit Co. wharf, Bowden, Jamaica, B. W. I.
Type repository: Ithaca: Paleontological Research Institution, Ithaca, N. Y

Current identification/main database link: Globorotalia miocenica Palmer 1945


Original Description

Test of average size; dorsally flat; ventrally strongly convex; composed of 2½ whorls with about six chambers in the final whorl; dorsal sutures broadly curved, clear, limbate but not generally elevated; spiral suture and periphery with limbate, elevated border; ventral sutures radial, depressed; ventrally the chambers terminate in a small, open umbilical depression. Aperture extending from the umbilical to the periphery on the inner base of the final chamber. Surface very finely but distinctly perforate.

Size:
diameter of the holotype, 0.6 mm.; height, 0.2 mm.

Extra details from original publication
The variety differs from the typical species in being strongly convex ventrally. Very probably the new variety is present in the Florida for Dr.Cushman made the following observation in his discussion of G. menardii (d'Orbigny) 'A few specimens show much more vartiation in convexity of the ventral side than do most Recent specimens' (Cushman 1930, Florida State Geol. Survey, Bull. 4, p.60).

The new variety also recalls G. truncatulinoides (d'Orbigny) but has more chambers in the final whorl with curved, not radial, dorsal sutures and the outline of the ventral chambers in side view is more obliaue from periphery toward the umbilicus.

References:

Blow, W. H. (1969). 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. 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

Palmer, D. K. (1945). Palmer, D. K. (1945). Notes on the Foraminifera from Bowden, Jamaica. Bulletins of American Paleontology. 29(115): 1-82. Bulletins of American Paleontology. 29(115): 1-82. gs


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Globorotalia menardii miocenica compiled by the pforams@mikrotax project team viewed: 18-6-2025

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