Globorotalia ehrenbergi Bolli 1957 (TaxonConcept

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Species Globorotalia ehrenbergi Bolli 1957

Alternative name:

Globorotalia (Globorotalia) ehrenbergi Bolli 1957

Diagnosis / Definition:

Bolli (1957):
Shape of test low trochospiral, compressed; equatorial periphery strongly lobate; axial periphery acute, last chamber often with a faint keel. Wall calcareous, perforate, surface smooth. Chambers compressed; about 12-15, arranged in 2-3 whorls, the 5 chambers of the last whorl increasing fairly rapidly in size. Sutures on spiral side slightly curved, distinctly depressed; on umbilical side radial, depressed. Umbilicus shallow, open. Aperture a low arch, with a lip; interiomarginal, extraumbilical umbilical. Coiling random. Largest diameter of holotype 0.28 mm.

Discussion / Comments:

Bolli (1957):
Globorotalia membranacea (Ehrenberg) has frequently occurred in the literature (see Cushman and Bermudez, 1949, p. 34). Ehrenberg (1854) figured under Planulina membranacea the spiral views of 2 rotalid Foraminifera from the Cretaceous that are at least specifically different. Of these, one (pl. 26, fig. 43) could be near to a form subsequently described on several occasions as Globorotalia membranacea (for example, from Trinidad by Cushman and Renz, 1946). No description or depository of a holotype was given by Ehrenberg however. It is for these reasons that a new name had to be chosen for these Paleocene specimens described as Globorotalia membranacea. Globorotalia ehrenbergi developed from Globorotalia compressa (Plummer) and is regarded as the ancestor of Globorotalia pseudomenardii Belli, new species, and possibly of Globorotalia elongata Glaessner.

Systematics:

20
Genus Globorotalia
  Species Globorotalia ehrenbergi
   Species Globorotalia quadrata
    Species Globorotalia velascoensis

32
Ordo Foraminiferida
  Familia Globorotaliidae
   Genus Globorotalia
    Species Globorotalia ehrenbergi

Synonym list:

Bolli (1957):

1928 Globorotalia membranacea Ehrenberg. - White : p .280 pl. 38, fig. 1

1949 Globorotalia membranacea Ehrenberg. - Cushman & Bermudez : pp. 34-35 pl. 6, figs. 16-18

1957 Globorotalia ehrenbergi Bolli. - Bolli : pl. 20, figs. 18-20 new species

Was used in synonym list of:

Planorotalites chapmani Parr 1938

Globanomalina ehrenbergi Bolli 1957

Globanomalina compressa Plummer 1926

Planorotalites ehrenbergi Bolli 1957

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

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

Anonymous: Unedited TaxonConcept data

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