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Species Globorotalia uncinata Bolli 1957


Diagnosis / Definition:
Bolli (1957):
Shape of test low trochospiral, spiral side almost flat or slightly convex, umbilical side distinctly convex; equatorial periphery distinctly lobate; axial periphery rounded to subangular. Wall calcareous, perforate, surface finely spinose. Chambers subangular, inflated, laterally compressed; 12-15, arranged in about 2 1/2 whorls, the 5-6 chambers of the last whorl increasing moderately in size. Sutures on spiral side strongly curved, depressed; on umbilical side radial, depressed. Umbilicus fairly narrow, deep, open. Aperture a low arch; interiomarginal, extraumbilical umbilical. Coiling random. Largest diameter of holotype 0.35 mm.
Discussion / Comments:
Bolli (1957):
Globorotalia uncinata Bolli, new species, differs from the related G. pseudobulloides (Plummer) in having subangular, laterally distinctly truncated chambers and more strongly curved sutures on the spiral side. An intermediate specimen is shown on plate 17, figures 16-18 (USNM P5075). Globorotalia uncinata is regarded as the ancester of Globorotalia angulata (White). A transitional form between these two species is shown on plate 17, figures 10-12 (USNM P5074).
Systematics:

20
 Genus Globorotalia
  Species Globorotalia pseudobulloides
   Species Globorotalia uncinata
    Species Globorotalia velascoensis

32
 Ordo Foraminiferida
  Familia Globorotaliidae
   Genus Globorotalia
    Species Globorotalia uncinata
Synonym list:
Bolli (1957):
1957 Globorotalia uncinata Bolli. - Bolli : pl. 17, figs. 13-15 new species
Was used in synonym list of:
Morozovella uncinata Bolli 1957
Morozovella praeangulata Blow 1979
Praemurica uncinata Bolli 1957
References:

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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