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Globorotalia formosa formosa Bolli 1957 from: Bolli, H.M. (1957): The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad, B.W.I . Bulletin of the U.S. National Museum Vol. 215 p. 61-82
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Anonymous: Unedited TaxonConcept data
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Subspecies Globorotalia formosa formosa Bolli 1957


Diagnosis / Definition:
Bolli (1957):
Shape of test very low trochospiral, spiral side almost flat, inner whorls occasionally slightly raised, umbilical side strongly convex; equatorial periphery slightly lobate, nearly circular; axial periphery angular with pronounced keel which is ornamented with spines in well preserved specimens. Wall calcareous, perforate, surface finely to distinctly spinose, especially on the umbilical side. Chambers angular, inflated; 15-18, arranged in about 3 whorls; the 6-8 chambers of the last whorl increasing slowly in size. Sutures on spiral side, curved; on umbilical side radial, depressed. Umbilicus fairly wide, deep, open. Aperture a low arch; interiomarginal, extraumbilical umbilical. Coiling about 90 percent dextral in the Globorotalia formosa formosa zone, becoming predominantly sinistral in the Globorotalia aragonensis zone (up to 64 percent). Largest diameter of holotype 0.65 mm.
Discussion / Comments:
Bolli (1957):
Globorotalia formosa formosa Bolli, new species, new subspecies, differs from the related G. formosa gracilis Bolli, new species, new subspecies, in its more robust test, larger size, and greater number of chambers in the last whorl. G. formosa formosa differs from G. aragonensis Nuttall in its slightly larger size, more lobate periphery, greater number of chambers in the last whorl, and wider umbilicus. Also, it has a much more restricted stratigraphic range.
Synonym list:
Bolli (1957):
1946 Globorotalia velascoensis Cushman. - Cushman & Renz : p. 47 pl. 8, figs. 13-14
1957 Globorotalia formosa formosa Bolli. - Bolli : pl. 18, figs. 1-3 new species, new subspecies
Was used in synonym list of:
References:

Cushman,J.A. and Renz,H.H. (1946):
The Foraminiferal Fauna of the Lizard Springs Formation of Trinidad, British West Indies . Cushman Laboratory for Foraminiferal Research, Special Publication Vol. 18 p. 1-48

Bolli,H.M. (1957):
The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad, B.W.I . Bulletin of the U.S. National Museum Vol. 215 p. 61-82
Anonymous: Unedited TaxonConcept data
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