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Species Globorotalia compressa Plummer 1926


Alternative name:
Globorotalia (Globorotalia) compressa Plummer 1926
Diagnosis / Definition:
Bolli (1957):
Shape of test very low trochospiral, inflated; equatorial. periphery distinctly lobate, slightly elongate; axial periphery subacute to acute. Wall calcareous, perforate, surface smooth. Chambers slightly compressed; 12-15, arranged in about 2 1/2 whorls, the 4-5 chambers of the last whorl increasing fairly rapidly in size. Sutures on spiral side radial to slightly curved in early chambers, radial in last chambers, depressed; on umbilical side radial, depressed. Umbilicus fairly wide, open, Aperture a distinct arch, may have a slight lip; interiomarginal, extraumbilical umbilical. Coiling random. Largest diameter of figured hypotype 0.23 mm.
Discussion / Comments:
Bolli (1957):
Globorotalia compressa (Plummer) is the ancestor of G. ehrenbergi Bolli, new species, from which it is distinguished by its smaller size, less compressed chambers and absence of a peripheral keel.
Systematics:

20
 Genus Globorotalia
  Species Globorotalia compressa
   Species Globorotalia pseudobulloides
    Species Globorotalia uncinata
     Species Globorotalia velascoensis
Synonym list:
Bolli (1957):
1926 Globigerina compressa Plummer. - Plummer : p. 135 pl. 8, fig. 8
1952 Globorotalia compressa Plummer. - Brönnimann : p. 25 pl. 2, figs. 19-24
1957 Globorotalia compressa Plummer. - Bolli : pl. 20, figs. 21-23
Was used in synonym list of:
Globanomalina compressa Plummer 1926
Globanomalina planocompressa Shutskaya 1965
References:

Plummer,H.J. (1926):
Foraminifera of the Midway Formation in Texas . University of Texas Bulletin Vol. 2644(1) p. 1-206

Brönnimann,P. (1952):
Trinidad Paleocene and lower Eocene Globigerinidae . Bulletins of American paleontology Vol. 34(143) p. 1-34

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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