CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia birnageae Blow 1959
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.
Original Description Test low trochospiral; spire opening regularly but fairly slowly, with usually six chambers in the last whorl; equatorial profile almost circular; equatorial periphery slightly lobate; axial periphery rounded, with the test appearing rather parallel-sided in side view; chambers slightly elongated tangentially as viewed from the spiral side, not inflated, but usually embracing; last chamber often smaller than its predecessor; spiral side flat to slightly convex; umbilical side slightly convex; sutures of the spiral side radial, slightly depressed, sometimes rather indistinct; umbilicus, small, often completely closed; aperture slithke with a distinctive lip, interiomarginal, umbilical-extraumbihcal; wall calcareous, finely perforate. Size: Maximum diameter of holotype, 0.22 mm. Etymology: The species is named after Miss G. N. Birnage, Librarian of the Palaeontological Department, The British Petroleum Company Limited, London, in recognition of her assistance in compiling this work. Extra details from original publication Remarks: This species differs from Globorotalia kugleri Bolli in having less deeply incised sutures, rather tangentially elongated chambers, a closed or almost closed umbilicus, fewer chambers in the last whorl, and a less highly arched aperture which has a more distinctive lip. It differs from Goborotalia mayeri Cushman and Ellisor in being consistently much smaller in size, in the closed (or almost closed) umbilicus, and also in having slightly more tangentially elongated chambers as seen from the spiral side. It differs from Globorotalia opima continuosa Blow, subsp. nov. in having more chambers in the last whorl. It also differs from Globorotalia fohsi barisanensis (LeRoy) in having a more circular outline and a less convex (not vaulted) umbilical side.
References:
Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. gs
Leckie, R. M. et al. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Paragloborotalia and Parasubbotina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 5): 125-178. gs
Globorotalia birnageae compiled by the pforams@mikrotax project teamviewed: 9-9-2024
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birnageae_USNM625709_holo.jpg
Blow 1959 pl16 f108.JPG
Olig Atlas pl05-02 01 3.JPG
birnageae_USNM625709_holo.jpg
Blow 1959 pl16 f108.JPG
Olig Atlas pl05-02 01 3.JPG
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