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Species Globigerinoides conglobatus Brady 1879


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test large, tightly coiled, trochespiral, subglobular to subquadrate, three to three and a half chambers in the final whorl increasing very slowly in size as added; sutures distinctly depressed, almost radial; surface coarsely perforated with spines and spine bases; umbilius narrow; primary aperture interiomarginal, umbilical, a long, low asymmetric arch bordered by a thin rim; sutural supplementary apertures, small, irregular on the spiral side.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gs. conglobatus is distinguished by its thick-walled and tightly coiled test. Specimens representing an evolutionary and morphologic transition between Gs. extremus and Gs. conglobatus resemble Gs. conglobatus canimarensis Bermudez. We concur with Parker (1973) and Stainforth et al. (1975) in treating Gs. canimarensis as a synonym of Gs. conglobatus. Following Mistretta (1962), Globigerinoides gomitulus Seguenza, 1880) with a smaller and compact test than Gs. conglobatus is considered a junior synonym of Gs. conglobatus.
Bolli & Saunders (1985):
This Pliocene to Holocene large sized subglobular species (lectotype 0.85 mm) with its later chambers distinctly depressed is easily recognizable. Bermudez (1961) erected a G. canimarensis (Fig. 21.3) as an ancestral form of G. conglobatus. It differs in smaller test size and higher arched primary and secondary apertures. Brady (1879) regarded G. conglobatus as a modification of G. ruber, in which the chambers of the final whorl become predominant in size. Another possibility is that G. obliquus extremus with its similarly depressed final chambers and similar position of the primary aperture, is the ancestral line.
Chaisson & Pearson (1997):
Specimens of this taxon that are not fully encrusted may be confused with specimens of Globigerinoides extremus having particularly compressed chambers. Gs. conglobatus may be distinguished by its more globose test.
Chaisson & Leckie (1993):
Remarks: This species is never abundant in Hole 806B. It can be encrusted with secondary calcite. Similar species: See Globigerinoides extremus.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globigerinaceae
       Superfamilia Nonionacea
        Familia Globigerinidae
         Genus Globigerinoides
          Species Globigerinoides conglobatus
Synonym list:
Chaisson & d'Hondt (2000):
1879 Globigerina conglobata Brady. - Brady : 28b
1983 Globigerinoides conglobatus Brady. - Kennett & Srinivasan : p.58 pl 12 figs 4-6
Bolli & Saunders (1985):
1879 Globigerina conglobata Brady. - Brady : p.286 pl. 80, figs. 1-3 not designated as holotype
1960 Globigerinoides conglobatus Brady. - Banner & Blow : p.6 pl. 4, figs. 4a-c
1985 Globigerinoides conglobatus Brady. - Bolli & Saunders : p.195 figs. 21.1; 7,10,11
Chaisson & Pearson (1997):
1879 Globigerina conglobata Brady. - Brady : p. 28 b
1983 Globigerinoides conglobatus Brady. - Kennett & Srinivasan : p. 58 pl. 12, figs. 4-6
Vincent & Toumarkine (1990):
1879 Globigerina conglobata Brady. - Brady : p. 28b
1990 Globigerinoides conglobatus Brady. - Vincent & Toumarkine : p. 830 pl. 1, figs. 21, 22
Chaisson & Leckie (1993):
1879 Globigerina conglobata Brady. - Brady : 28b
1983 Globigerinoides conglobatus Brady. - Kennett & Srinivasan : p.58 pl. 12; fig. 4-6
1993 Globigerinoides conglobatus Brady. - Chaisson & Leckie : p.170 pl. 2; fig. 8
Quilty (1976):
1879 Globigerinoides conglobatus Brady. - Brady : p.286 (figures Brady 1884, pl. 8, fig. 1-5)
1960 Globigerinoides conglobatus Brady. - Banner & Blow : p.6 pl. 4, fig. 4
1976 Globigerinoides conglobatus Brady. - Quilty : p.677 pl. 6, fig. 3
Was used in synonym list of:
Praeorbulina sicana De Stefani 1950
Globigerinatheka index Finlay 1939
Globigerinatheka tropicalis Blow & Banner 1962
Stratigraphy - absolute ages:
FAD: 6.27 ± 0.04 [Ma], Chaisson & d'Hondt (2000) ODP Leg 165 Site 999
References:

Brady,H.B. (1879):
Notes on some of the reticularean Rhizopoda of the Challenger Expedition, Part II. Additions to the knowledge of the porcellanous and hyaline types. . Q. J. Microsc. Sci. Vol. 19

Banner,F.T. and Blow,W.H. (1960):
Some primary types of species belonging to the superfamily Globigerinaceae . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 11(1) p. 1-41

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

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

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

Chaisson,W.P. and Leckie,R.M. (1993):
High-Resolution Planktonic Foraminifer Biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 130 Eds: Berger, W.H.Kroenke, L.W..Mayer, L.A..et al. p. 137-178

Chaisson,W.P. and Pearson,P.N. (1997):
Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 154 Eds: Shackleton, N.J.Curry, W.B.Richter, C.Bralower, T.J.

Chaisson,W.P. and d'Hondt,S.L. (2000):
Neogene planktonic foraminifer biostratigraphy at Site 999, Western Caribbean Sea.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 165 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 19-56
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