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Species Globigerina venezuelana Hedberg 1937


Discussion / Comments:
Bolli (1957):
Considerable variation in size and shape of chambers is found in Globigerina venezuelana. The differences, however, appear not to be constant enough to allow a further division of the species. It is found for instance that the chambers of G. venezuelana are generally more spherical in the Globorotalia opima opima zone to the Globorotalia kugleri zone and again in the Globorotalia fohsi lobata zone to the Globorotalia menardii zone. In the Catapsydrax dissimilis zone to the Globorotalia fohsi fohsi zone the specimens are often somewhat compressed laterally. The same is also true for the Globigerina ampliapertura zone, where many specimens have only 3 chambers in the last whorl instead of the usual 4. A small, rudimentary final chamber (see pl. 23, figs. 7b, 8b) commonly occurs in Globigerina venezuelana. It is attached in the conventional way and does not cover the umbilicus and therefore can not be regarded as a bulla.
Quilty (1976):
Remarks: The specimens recorded in the Pleistocene of DWBP 134, 100-102 cm are genuine members of this species and distinct from G. conglomerata. This seems to be the youngest true record of this species.
Systematics:

21
 Genus Globigerina
  Genus Globigerinoides
   Species Globigerina venezuelana
    Species Globigerinoides obliqua

22
  Genus Globigerina
   Species Globigerina venezuelana

24
  Genus Globigerina
   Species Globigerina venezuelana
Synonym list:
Bolli (1957):
1937 Globigerina venezuelana Hedberg. - Hedberg : p. 681 pl. 92, figs. 7a-b
1945 Globigerina venezuelana Hedberg. - Cushman & Stainforth : p. 67 pl. 12, figs. 13a-b
1949 Globigerina venezuelana Hedberg. - Bermudez : p. 280 pl. 21, figs. 39-40
1953 Globigerina conglomerata Schwager. - Beckmann : p. 391 pl. 25, figs. 6-9
1957 Globigerina venezuelana Hedberg. - Bolli : pl. 23, figs 6a-8b
Bolli (1957):
1937 Globigerina venezuelana Hedberg. - Hedberg : p. 681 pl. 92, figs. 7a-b
1945 Globigerina venezuelana Hedberg. - Cushman & Stainforth : p. 67 pl. 12, figs. 13a-b
1949 Globigerina venezuelana Hedberg. - Bermudez : p. 280 pl. 21, figs. 39-40
1953 Globigerina conglomerata Schwager. - Beckmann : p. 391 pl. 25, figs. 6-9
1957 Globigerina venezuelana Hedberg. - Bolli : p. 272 pl. 35, figs. 16a-17
1957 Globigerina venezuelana Hedberg. - Bolli : p. 110 pl. 23, figs. 6a-8b
Spezzaferri & Silva (1990):
1985 Globigerina venezuelana Hedberg. - Bolli & Saunders : fig. 13 (20)
1990 "Globigerina" venezuelana Hedberg. - Spezzaferri & Silva : p.245 pl. VII; fig. 2a-c, 5a-b
Quilty (1976):
1937 Globigerina venezuelana Hedberg. - Hedberg : p.681 pl. 92, figs. 7a-b
1976 Globigerina venezuelana Hedberg. - Quilty : p.673 pl. 4, figs. 13-14
Was used in synonym list of:
Globoquadrina venezuelana Hedberg 1937
Globigerina rohri Bolli 1957
Dentoglobigerina pseudovenezuelana Blow & Banner 1962
References:

Hedberg,H.D. (1937):
Foraminifers of the middle Tertiary Carapita Formation of northeastern Venezuela. . Journal of Paleontology Vol. 11(8) p. 661-697

Cushman,J.A. and Stainforth,R.M. (1945):
The Foraminifera, of the Cipero marl formation of Trinidad, British West Indies . Cushman Lab. Foram. Res. Vol. 14 p. 1-75

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

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

Quilty,P.G.. (1976):
Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

Spezzaferri,S. and Silva,I.S.. (1990):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263
Anonymous: Unedited TaxonConcept data
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