Globorotalia fohsi robusta Bolli 1950 (TaxonConcept

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Subspecies Globorotalia fohsi robusta Bolli 1950

Alternative name:

Globorotalia (Fohsella) fohsi robusta Bolli 1950

Discussion / Comments:

Bolli & Saunders (1985):
This is the end form of the fohsi lineage. It differs from lobata in having a more compact, circular outline in equatorial view, instead of being more elongate like the earlier fohsi subspecies. The last chambers are generally less elongate compared with lobata with the periphery not lobate or, if it is, only very slightly so and only in the last few chambers. A distinct peripheral keel is present throughout the last whorl which tends to have more chambers (7-8) than does lobata. The spiral side of the test is usually lower, the umbilical side higher.
Srinivasan (1975):
Globorotalia fohsi robusta, which is the end member of the G. fohsi lineage (Bolli, 1957), is very rare in the examined area, but intermediate forms linking G. fohsirobusta to its ancestor, G. fohsilobata, are frequent.

Systematics:

1
Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Globorotaliidae
         Genus Globorotalia
          Species Globorotalia fohsi
           Subspecies Globorotalia fohsi robusta

Synonym list:

Bolli & Saunders (1985):

1950 Globorotalia fohsi robusta Bolli. - Bolli : p.89 pl.15, figs.3a-c

1985 Globorotalia fohsi robusta Bolli. - Bolli & Saunders : p.214 figs. 29.1,7; 6,9,12

Bolli (1957):

1950 Globorotalia fohsi robusta Bolli. - Bolli : pp. 84,89 pl. 15, figs. 3a-c

1957 Globorotalia fohsi robusta Bolli. - Bolli : pl. 28, figs. 16a-c

Srinivasan (1975):

1950 Globorotalia fohsi robusta Bolli. - Bolli : p.84 pl. 15; fig. 3

1975 Globorotalia fohsi robusta Bolli. - Srinivasan : p.147 pl. 3; fig. 11-12

Vincent & Toumarkine (1990):

1950 Globorotalia fohsi robusta Bolli. - Bolli : pp. 84,89 pl. 15, fig. 3

1990 Globorotalia fohsi robusta Bolli. - Vincent & Toumarkine : p. 802

Was used in synonym list of:

Globorotalia (Fohsella) fohsi robusta Bolli 1950

Globorotalia fohsi Cushman & Ellisor 1939

Stratigraphy - absolute ages:

LAD: 11.9 ± 0 [Ma], Berggren et al. (1995)
FAD: 12.3 ± 0 [Ma], Berggren et al. (1995)

References:

Bolli,H.M. (1950):
The direction of coiling in the evolution of some Globorotaliidae . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 1(3-4) p. 82-89

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

Srinivasan,M.S. (1975):
Middle Miocene Planktonic Foraminifera from the Hut Bay Formation, Little Andaman Island, Bay of Bengal . Micropaleontology Vol. 21(2) p. 133-150

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

Vincent,E. and Toumarkine,M. (1990):
Neogene planktonic foraminifers from the Western Tropical Indian Ocean, Leg 115.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 115 Eds: Duncan, R.A..Backman, J.Peterson, L.C. p. 795-836

Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995):
A revised Cenozoic Geochronology and Chronostratigraphy.
In: Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication Vol. 54

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