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Species Globorotalia quadrata White 1928


Diagnosis / Definition:
Bolli (1957):
Shape of test very low trochospiral, spiral side commonly slightly concave, umbilical side inflated; equatorial periphery lobate, quadrangular; axial periphery rounded. Wall calcareous, perforate, surface smooth, early chambers finely cancellate. Chambers inflated, globular to slightly compressed laterally; about 10-12, arranged in 2 1/2 whorls, the 4-5 chambers of last whorl increasing rapidly in size; ultimate chamber commonly slightly smaller than penultimate. Sutures on spiral side radial, depressed; on umbilical side: radial, depressed. Umbilicus fairly wide, open. Aperture a low arch; interiomarginal, extraumbilical umbilical. Coiling random. Largest diameter of figured hypotype 0.42
Discussion / Comments:
Bolli (1957):
Because of the interiomarginal, extraumbilical umbilical position of the aperture, quadrata is removed from Globigerina to Globorotalia. The species is morphologically closely related to Globorotalia trinidadensis Bolli, new species, from which it differs in having fewer chambers in the final whorl.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Globorotaliidae
         Genus Globorotalia
          Species Globorotalia quadrata

20
  Genus Globorotalia
   Species Globorotalia quadrata
    Species Globorotalia velascoensis
Synonym list:
Bolli (1957):
1928 Globigerina quadrata White. - White : p. 195 pl. 27, figs. 18a-b
1957 Globorotalia quadrata White. - Bolli : pl. 17, figs. 22-24
Was used in synonym list of:
Morozovella angulata White 1928
References:

White,M.P. (1928):
Some index foraminifera of the Tampico embayment of Mexico, Part 2 . Journal of Paleontology Vol. 2(4) p. 280-313

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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