Globorotalia aragonensis Nuttall 1930 (TaxonConcept

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Species Globorotalia aragonensis Nuttall 1930

Alternative name:

Globorotalia (Truncorotalia) aragonensis Nuttall 1930

Globorotalia (Morozovella) aragonensis Nuttall 1930

Diagnosis / Definition:

Bolli (1957):
Shape of test very low trochospiral; spiral side almost flat or slightly convex, umbilical side strongly convex and slightly inflated; equatorial periphery nearly circular; axial periphery angular with keel, which is ornamented with small spines in well preserved specimens. Wall calcareous, perforate; surface, especially the umbilical side, rugose or with short, thick spines. Chambers angular, inflated; 15-18, arranged in about 3 whorls; the 6-7 chambers of the last whorl increasing slowly in size. Sutures on spiral side curved, often slightly raised and beaded; on umbilical side radial, slightly depressed. Umbilicus narrow, deep, open. Aperture a low arch; interiomarginal, extraumbilical umbilical. Coiling preponderantly dextral in the lower part of the Globorotalia formosa formosa zone (over 90 percent); in its upper part reversing to a strongly predominant sinistral coiling in the Globorotalia aragonensis zone (about 90 percent). Largest diameter of figured hypotype 0.55 mm.

Discussion / Comments:

Bolli (1957):
Globorotalia aragonensis Nuttall differs from the ancestral G. rex Martin in having a more compact test, less lobate periphery, stronger peripheral keel, a greater number of chambers, and a strong preference for sinistral coiling in the younger specimens.

Systematics:

20
Genus Globorotalia
  Species Globorotalia aragonensis
   Species Globorotalia compressa
    Species Globorotalia velascoensis

24
  Genus Globorotalia
   Species Globorotalia aragonensis
    Species Globorotalia aspensis
     Species Globorotalia broedermanni

32
Ordo Foraminiferida
  Familia Globorotaliidae
   Genus Globorotalia
    Species Globorotalia aragonensis

Synonym list:

Bolli (1957):

1930 Globorotalia aragonensis Nuttall. - Nuttall : p. 288 pl. 24, figs. 6-8

1948 Globorotalia aragonensis Nuttall. - Cushman & Renz : p. 40 pl. 8, figs. 1-2

1949 Globorotalia aragonensis Nuttall. - Cushman & Bermudez : pp. 38-39 pl. 7, figs. 13-15

1957 Globorotalia aragonensis Nuttall. - Bolli : pl. 18, figs. 7-9

Bolli (1957):

1930 Globorotalia aragonensis Nuttall. - Nuttall : p. 288 pl. 24, figs. 6-8

1948 Globorotalia aragonensis Nuttall. - Cushman & Renz : p. 40 pl. 8, figs. 1-2

1949 Globorotalia aragonensis Nuttall. - Bermudez : p. 284 pl. 22, figs. 33-35

1949 Globorotalia (Truncorotalia) aragonensis Nuttall. - Cushman & Bermudez : pp. 38-39 pl. 7, figs. 13-15

1957 Globorotalia aragonensis Nuttall. - Bolli : p. 275 pl. 39, figs. 1a-c

1957 Globorotalia aragonensis Nuttall. - Bolli : p. 75 pl. 18, figs. 7-9

Was used in synonym list of:

Morozovella aragonensis Nuttall 1930

References:

Nuttall,W.L.F. (1930):
Eocene foraminifera from Mexico . Journal of Paleontology Vol. 4 p. 271-293

Cushman,J.A. and Renz,H.H. (1948):
Eocene Foraminifera of the Navet and Hospital Hill formations of Trinidad, B.W.I. . Cushman Lab. Foram. Res., Spec. Publ. Vol. 24 p. 1-42

Bermudez,P.J. (1949):
Tertiary smaller foraminifers of the Dominican Republic . Spec. Publ.Cushman Lab. Foraminiferal Res., Vol. 25 p. 1-322

Cushman,J.A. and Bermudez,P.J. (1949):
Some Cuban species of Globorotalia . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 25 p. 26-44

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

Bolli,H.M. (1957):
Planktonic Foraminifera from the Eocene Navet and San Fernando formations of Trinidad, B.W.I. . Bull. U.S. natl. Mus. Vol. 215 p. 155-172

Anonymous: Unedited TaxonConcept data

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