Globigerina rohri Bolli 1957 (TaxonConcept

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Species Globigerina rohri Bolli 1957

Diagnosis / Definition:

Bolli (1957):
Shape of test trochospiral; equatorial periphery slightly lobate; because of the lateral compression of the chambers, the test has a somewhat spherical appearance. Wall calcareous, perforate, surface finely pitted. Chambers spherical, those of last whorl laterally compressed; about 12, arranged in about 2 1/2 whorls; the 3 or occasionally 4 chambers of the last whorl increase very rapidly in size; in large specimens the final chamber is commonly reduced in size. Sutures on spiral side curved in early stage, radial or oblique later, depressed; on umbilical side radial, depressed. Umbilicus small, deep; rugosities or short thick spines are found around the umbilical edge. Aperture arched; interiomarginal, umbilical; because of the almost closed umbilicus not well visible. Coiling random. Largest diameter of holotype 0.73 mm.

Discussion / Comments:

Bolli (1957):
Globigerina rohri, new species, is distinguished from G. venezuelana Hedberg by having usually 3 instead of 4 chambers in the last whorl, by the rugosities or short spines around the umbilical edge and by having the chambers of the last whorl laterally more compressed. The species is named for Dr. K. Rohr in recognition of his geological work in Trinidad.

Systematics:

21
Genus Globigerina
  Genus Globigerinoides
   Species Globigerina rohri
    Species Globigerinoides obliqua

24
  Genus Globigerina
   Species Globigerina rohri

Synonym list:

Bolli (1957):

1957 Globigerina rohri Bolli. - Bolli : pl. 23, figs. 1a-4b new species

Bolli (1957):

1953 Globigerina venezuelana Hedberg. - Beckmann : p. 392 pl. 10, figs. 12-13

1957 Globigerina rohri Bolli. - Bolli : p. 273 pl. 36, figs. 4a-b

1957 Globigerina rohri Bolli. - Bolli : p. 109 pl. 23, figs. 1a-4b

Was used in synonym list of:

Globoquadrina rohri Bolli 1957

References:

Beckmann,J.P. (1953):
Die Foraminiferen der Oceanic Formation (Eocaen-Oligocaen) von Barbados, Kl. Antillen . Ecoglae geologicae Helvetiae Vol. 46 p. 301-412

Bolli,H.M. (1957):
Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I..
In: Studies in Foraminifery, Bulletin of the U.S. National Museum Vol. 215 Eds: Loeblich, A.R.Tappan, H.Beckmann, J.P.Bolli, H.M.Gallitelli, E.M.Troelsen, J.C. p. 97-123

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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